Input all the dimensions in the input section of the above calculator. You should start by placing your rebar a foot away from the sides of the space. Calculate. 5 units. For instance, try using a free online concrete slab calculator for most accurate results. 1100 x 100,000 equals 11,000 bars 20’ long. The total quantity of steel required in the given slab is 565. Closer spacing can also increase the amount of reinforcement and decrease the potential for changes in the concrete’s surface during curing. The exact distance from the reinforced concrete slab’s edge to the rebar should depend on the specific application, size, and thickness of the slab. For example, the length is 20 inches and the width is 15 inches, the area is. g. The most commonly used rebar sizes for slabs up to six inches thick are #5 and #6. 5 = 158. 037 to get cubic yards of concrete. 6m × 5m × 0. ) by the width (10 ft. Thumb rule to estimate Steel quantity of above slab = Volume of Concrete x Density of Steel x % of Steel of Member. Check it against the factored shear load on the slab, 0. 2. When reinforcement bars of different sizes are bundled as compression bars, the lap length chosen must be larger of the following cases: Compression splice length of the least diameter bar or. 78. e. After that, the following steps will be taken to compute steel quantity. 2, see D. Table 5. You’ll find that #3, #4, and #5 size rebar is most commonly found in home reno stores and used in footings for homes and other domestic structures. Standard Data Taken The density of Steel Rod = 7850 Kg/m 3 1 meter = 3. Columns that support flat plate slabs and columns that are supported by footings are the most common examples. There is two spacing between 3 reinforcement and 50 mm length both side of 1st and 3rd reinforcement used in footing. The Rebar Volume or Displacement calculator computes the total volume (V) displaced by rebar based on the length (L) and size (S) of rebar. 6 ÷ 12 = 0. ( RL) Length of the pre-cut rebar sticks being used to. Fill in the price and single rebar length that you will buy at your supplier: rebar price = €2/m single rebar. Retaining Walls: The most commonly used rebars in retaining walls are #3, #4 and #5. 08 x 50 = 4 total cubic yards of concrete for 50 tubes. 1 m)Rebar Grid Calculator. The PT Calculator can be used for the following building types: Podium slab with 3 levels of wood construction (4 levels of wood with roof) Podium slab with 4 levels of wood construction (5 levels. 0009fy - 24)d; [ For fy > 60,000 psi] The minimum lap length for compression bars must be 12inches. 1. Like our other calculators, this reinforced concrete Beam Capacity Calculator is very easy to use. In order to simplify the analysis and to be able to use the superposition principle for evaluating the effect of load combinations, linear analysis is generally adopted even though concrete slabs normally have a pronounced non-linear response. · Enter the Thickness of the slab in mm only. In order to calculate this, you need to input the length and width. 5 allows for sufficient clearance for fitting the rebar within the slab. It has a foot print of four tires about 10 inches by 10 inches time 4. Where you are pouring the concrete will be your slab. With this calculator, you’re trying to calculate the dimensions of your rebar grid (length and width). 5 kPa), column spacing typically ranges from 15 to 25 ft (4. 33_6_0. For example, if SL is 50 feet, RL = 50 feet – 0. Feet. Minimum dimensions and axis distances for reinforced concrete slabs. The Rebar in a Circular Shaped Slab calculator estimates the total length and weight of reinforcement bars (rebar) needed for a circular shaped concrete slab. This reinforcing steel is called “temperature steel” and is not used for spanning soft spots, etc. The compression development length is calculated using Section 25. Step 4: Place all of the step-up rebar you’ll. Next, divide the total square footage by the size of the rebar. Mark your project plans with a highlighter wherever the psi amount you calculated in Step 3 is found. Once you know how much rebar you need, place an order or request an estimate. The effective compressive strength of a column increases as it is confined by the slab, and the. 075)kN m2 × 1m = 9. the calculator will give you the default spacing values (for rebar – rebar it’s 40cm, and for edge – grid it’s 8cm). The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. 2, two-way slabs are designed based on "column strips" and "middle strips". A 30-by-30-foot slab of concrete for a driveway, garage floor, or large patio costs $3,600–$7,200 on average. Sponsored LinksThe calculator estimates the number of rebar pieces needed for the slab. The current design codes discuss the effective compressive strengths of columns, which reflect a decrease in load transfer performance that can occur when columns and slabs have different concrete compressive strengths. j. 058 percent, which is only enough for crack containment. Hello ACE, In order to determine the load-carrying capacity of your existing roof slab you are going to need to determine several more items, such as: 1) Concrete compressive strength in Pounds per Square Inch (PSI) as determined by the Windsor Probe method. 2-inch slab; 2-inch chairs for a 4-inch slab; 21⁄ 2- i n c h chairs for a 41⁄ 2-inch slab and 3-inch chairs for a 5-inch slab. Less concrete, i. The first step is to determine how much rebar is required to support your foundation. The volume is simply the area (A = L*W) times the depth (D). Chapter 11—Fiber-reinforced concrete slabs-on-ground, p. e. Rebar Calculation For Slab Step-1: Get The Slab Layout Plan. Rebar Lapping. An Online Tool for Preliminary Floor System Design. NOTE: this calculator was updated on 16 Feb 2022 to accommodate the inset of rebar placement from the edge of the slab. 0 % of concrete volume. Av,min=0. Lets take example of RCC Column, where reinforcement. 85Vc > Vu. A typical 1,200-square-foot house foundation costs $6,900 to $16,200 for a concrete slab, or about $40,000 for a full unfinished basement. The type of and intended use of concrete impacts the need for rebar reinforcement. 12. 4. Products. 01. OR, you can add reinforcing steel. Video Shortcuts:@0:45 Prep w. = 7. This will allow you to calculate the square footage of the slab. Step 1: Determine the dimensions: Measure the length and width of the concrete slab in feet. The minimum compression development length shall not be less than 200mm. **Unit weight in kg/m is calculated using the formula = D2/162 For 8mm bar = 8 2 /162 = 64/162 = 0. Initially, they mostly used in masonry structures to enhance their capacity. NOTE: this calculator was updated on 16 Feb 2022 to accommodate the inset of rebar placement from the edge of the slab. 0 + 6. of Main bars = (Width of Slab/Spacing) + 1. Effectively creating a border all around the rebar grid. The 0. g. 9 of ACI 318-14 or Section 12. It create a bending of the slab. INSTRUCTIONS: Choose units and enter the following: (r) Radius of Circular Slab (e. ( i) Inset distance from the side of the slab to the rebar grid (default of 3″). pre-mix 80 lb bags: $8 – $15 per bag. Multiply 0. "Specification for Tolerances for Concrete Construction and Materials" ACI 302. Measure the length and width of the top surface of the concrete pad in inches and then multiply them to get the pad's area in square inches. 4. If your wall is over 20 feet long it will add the amount of overlap required. 56% and Equation b) for λ= 1 and ρ w > 1. The volume is simply the area (A = L*W) times the depth (D). 5 to determine you will need 120 feet of rebar. Concrete calculators that estimate the amount of concrete and rebar you need for footings, concrete walls, concrete stairs, slabs, patios and driveways. 325 cubic feet. Rebar must be placed at the center of or slightly above the center of the concrete slab —hence why it should be a certain thickness for best results. You'll also need 26 at 30 feet for a total of 780 linear feet. 2. 4—Prestressed slab-column connection CHAPTER 1—INTRODUCTION AND SCOPE 1. 4 wire mesh in a 4-inch slab, P = 8. Total cost 1065. of Main bars = 20 + 1 = 21 Nos. A 4” concrete slab can easily support 125 lbs. The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. 37 cubic yards of concrete for a 4×4 slab that is 4 inches thick. Slabs are defined as two-way slabs when the ratio of long-to-short sides is less than 2. 5 kN/m2 (153 kg/m2) in domestic buildings to approximately 1 0 kN/m2 (1053 kg/m2) in heavy industrial areas. Click the button to calculate the volume of concrete and man-hours (not including mixing) needed for this. Convert your longitude measurement into inches: 15 feet x 12 inches per foot = 180 inches. The changing point in the use of the rebar in construction is the 19th century with enhancing its strength by embedding it in the concrete. The Area of a Concrete Slab calculator computes the surface area of a rectangular slab. The Rebar for an Irregular Shaped Slab calculator estimates the total length and weight of reinforcement bars (rebar) needed for an irregular shaped concrete slab. The weight of rebar can be easily calculated by using this standard formula mentioned below: W= (D2/162. Calculating the amount of rebar needed for a slab can be tricky because it is based on the size of the slab, the spacing between the rebar, and the type of steel used. An older reinforced concrete design calculator that computes required steel area for T-beams and 1-way slabs can be found here. area = 625 sq ft. How to use Concrete slab calculator tool? Input all the values in the input section of the Calculator. Weight (lbs/ft) = (Diameter^2 / 162. Steps to calculate weight of concrete slab in following:-. 5" Rebar Chair (911) 3" Rebar Chair (912) 2-Bar Footer Stand (928) 3-Bar Footer Stand (924) 2" Steel Mesh Chair (944) Find It Quick. The pavement slab directldesign method consists of determining thy e opposite the mismatched joint should be reinforced percentage of steel required, the thickness of the with a minimum of 0. 78. • A solid slab of concrete weighs 4,050 pounds per cubic yard. Every concrete slab should have a minimum. The effective compressive strength of a column increases as it is confined by the slab, and the. The formula for the weight of a slab used in this calculator is: Wt = L•W•D•mD. . 1 For longerHow do you calculate percentage of steel in concrete? Calculate the percentage of reinforcement with the formula P = 8. Inches. The rebar securely snaps in and doesn’t move when the concrete hits it. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. Values of α 1, α 2, α 3 and α 5 may be taken as for the calculation of anchorage length but for the calculation of α 3, ΣA st,min should be taken as 1. The size and type of rebar used in concrete slab footings will depend on the specific requirements of your project, including the size of the slab, the load it will support, and local building codes. The Length and Weight of Rebar in Concrete Slab calculator computes the total length and weight of rebar needed for one or more mats of rebar in a concrete slab. The net result is a more accurate and less conservative estimate. Calculate rebar length for the slab — RL — using the formula: RL = SL – 0. 24. effective depth d = h _ Ce. For flat slabs, grid spacing of 18 inches for driveways and 24 inches for patios is recommended. First, add up the total length of rebar you need. (as in example. of Main bars = (3000)/150 + 1. Calculate the volume of cubic yards needed to fill in a square or rectangular slab pour for flooring, walls & similar structures. Concrete and rebar must be used for every four feet of the foundation wall. 0 % of concrete volume. In this method, forces transfer from one bar to the other through concrete. pmax=CwCc [150+9000R/T] for walls with a rate of placement of. 65*6) = 1. Side walks, barn and granny floors : 5 - 6 inches (0. If your footings are 16 inches thick, multiply 16 by 80. Tensile stress is a force exerted on an object that lengthens or stretches that object. 2. 0. Now, look up the weight of your rebar. Estimation of steel reinforcement quantity is a necessary step in calculating cost of RCC structure along with other building materials as per. 5. The total quantity of steel required in the given slab is 565. In order to calculate this, you need to input the length and width of your slab. Tying rebar at joints and positioning it in the middle of the slab is essential for proper reinforcement. In addition, Rebar Calc provides provides a quick easy concrete volume estimator in cubic yards, a quick calculator to calculate how many bags of grout, fast setting concrete, etc. 24531 m 3. Besides the cost of concrete and materials, there are also labor costs. Input length, width and depth of the area. The formulas calculate materials needed for rectangular, circular and irregular shaped slabs. For driveways and patios, #4 (1/2 inch diameter) rebar is a common. 2) Development of the bar does NOT ensure that a concrete breakout failure will not occur. The experimental program was designed to evaluate how flexural performance at service and ultimate limit states are affected by a one-to-one replacement of Grade 60 with CRR bars, a reduction of concrete clear cover, and a reduction in rebarThe use of the rebar bar in construction extends up to the 15 century for masonry structures. The Weight of a Slab with Rebar calculator estimates the weight of a rectangular slab including rebar (if used). Finally, take a look at the calculation results: grid length = 5. Now the 6% of the above value = (2/100)X12. (Rebar Calculation Formula) No. The net result is a more accurate and less conservative estimate. Description. Calculate how much rebar you need to reinforce a concrete slab. Rebar: Concrete Block: Formula: 1. ( para español, HAGA CLIC AQUÍ) . 4. g. of bars = { (L or w – concrete cover for both sides) ÷ spacing} +1 Equation 8 where L or W: length or width of footing. The calculator estimates the number of rebar pieces needed for the slab. 1. 35 ft. If the slab will be exposed to a greater load or heavier materials, a larger rebar size may be necessary, such as #8 or #10. A concrete slab is versatile and durable that can be used in a wide variety of applications, including driveways and patios. Most times, rebar is tied with annealed steel wire, either bought in four pound bulk rolls, or if using a bag tie spinner, in bundles of precut wire pieces with loops. Add 5%-10% additional material for some waste or spills. Load capacity of simply supported concrete slabs. Rebar is. The type of. For example, if the area is 10 feet long and 6 feet wide, the square footage is 60 feet. The rebar within the concrete takes in some of the force applied to the concrete matrix. See full list on inchcalculator. based on the total depth of the slab). 5. 3 of ACI 318. When the dimensions of a slab, wall or other form exceed the length of a single stick of rebar, it is required to overlap and tie rebar pieces to create the added length. b. By: Olin Wade (Remodel or Move Stuff) Calculating the amount of rebar needed for a concrete slab involves many steps. Calculating The Rebar Spacing For A Concrete Slab. 12 ft). The pavement slab directldesign method consists of determining thy e opposite the mismatched joint should be reinforced percentage of steel required, the thickness of the with a minimum of 0. Nonstructural concrete shall have a minimum specified compressive strength, f´c, of 2,500 psi (17. 2. Access a comprehensive rebar weight chart. 005, which is equivalent to a maximum reinforcement ratio of 0. However,. area = 25′ × 25′. justcalc. Required fields are marked. This concrete calculator also calculates cubic meters. 1—Introduction In flat-plate floors, slab-column connections are subjected to high shear stresses produced by the transfer of the internal forces between the columns an d the slabs. This is the formula: mesh needed = slab area ÷ mesh area. This calculator assumes that you are using 20 foot long lengths of Rebar. As you. It requires input values for the. The compression development length is calculated using Section 25. I'm casting a 4m long triangular-profile reinforced gravity retaining wall against soil movement due to a 1 metre jump in ground level. of Wall = the # of concrete blockThe appropriate rebar size depends on the project, with #3 and #4 being common choices. compensating concrete demands the use of reinforcing steel so the concrete can expand and con-tract as planned. 5 feet = 49. Using bonded rebar in a concrete slab is a common method to increase the punching shear strength of the RC slab-column systems [8, 9]. Rebar is recommended for concrete that measures 5- 6 inches in depth. Estimation of steel reinforcement quantity is a necessary step in calculating cost of RCC structure along with other building materials as per. In simple, it is a concrete block provided to create the cover between the reinforcement bar and the concrete surface. Equate the balanced moment of resistance to the maximum bending moment; Find the effective depth ‘d’ from the above equation. EXAMPLE: Suppose we have a one-way slab, which has a length of 5 m or a width of 2 m (clear span). Set the forms at the proper height before bringing in the last lift. Concrete slab resting o n grade containing minimal distributed st eel, usually of weld ed wire fabric (WWF), for the purpose of limiti ng crack width due to shrinkage and tempera-ture change. per square foot without rebar, but you’ll need “control joints” or the slab will crack. L = Diameter of Circular Slab – Concrete Cover on both sides = 3000-(2*25) = 2950 mm. INSTRUCTIONS:. Choose the unit of all the dimension like, length, width, and thickness of slab in different unit like mm, cm, inch, meter, foot etc. Step 3: Determine the Amount of Rebar Required for the Foundation Walls. NOTE: this calculator was updated on 16 Feb 2022 to accommodate the inset of rebar placement from the edge of the slab. (feet + inches) Enter the grid spacing. Hello ACE, In order to determine the load-carrying capacity of your existing roof slab you are going to need to determine several more items, such as: 1) Concrete compressive strength in Pounds per Square Inch (PSI) as determined by the Windsor Probe method. Enter the length. A: A rebar spacer is a piece of concrete block (usually 25 to 50mm cube or 50mm dia cylindrical) intended to provide spacing between the outer surface of the finished concrete and the reinforcement inside. 1) Development of the bar ensures that the rebar won't pull out from the concrete due to a bond failure. For example, if you are using ½ inch rebar, divide 60 feet by 0. For example, let’s find the number of 5′ x 50′ rolls of mesh required to reinforce a slab that is 25′ by 25′. For example, let’s find the number of 5′ x 50′ rolls of mesh required to reinforce a slab that is 25′ by 25′. 5 CY for Site A and 21. Slab concrete properties definition before design optimization. Self-consolidating concrete (SCC) often requires larger-sized rebar to enhance its strength, such as #11 or larger. Multiply the number of crossing bars calculated in the previous step times the driveway's width minus 12 inches to determine the total linear quantity of rebar needed for the crossing bars. The weight of a concrete slab can be estimated by computing the volume of the slab and multiplying the volume (V) by the density of the concrete. 3. 6. 63ρb [ACI 318 Sec. 4. For heavy-duty purposes. Generally, it is recommended to use at least two layers for a slab and that the rebar should be placed 6 inches apart for maximum strength. Enhancement of the strength of the. Note that this calculation is the volume of your tubes only and does not account for any overflow or loss. Divide your result by the spacing measurement: 180 in / 14 in = 12. So you have to divide 320 by 4, which equals 80. You will get 1,280 inches or 106. 1. Now, calculating the quantity of steel = total volume of concrete x density of steel x 0. 3. Added 54% extra mortar to convert wet volume into dry volume. Take the value of diameter in terms of millimeter and length in terms of meters. Once this is complete, you will need to add the steel reinforcement bars (or similar) by clicking the "Add/Edit Steel Reinforcement. We typically ask our structural engineer for the weight of rebar is per sf (slabs) or volume of concrete for each mix/use. type of structure, and the diameter of the reinforcement. The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. For example, the percentage of reinforcement of a 30-inch slab with two layers of No. Rebar rod length of 6 m. For compatibility with older ACI codes, Ψr is taken as 1. . With our rebar calculator, you can eliminate guesswork and avoid costly mistakes. So, if you have a foundation wall that is 140 feet in total, you would divide that by four, to get a total of 35, which is the number of block cells. 5 feet. 04A c —- (3). Weight of one m of rebar is 0. yds. 2. coverage = 5′ × 50′. 05 percent of steel ireinforced concrete pavement, and the minimun m directions normal to each other for a distance of 3 allowable length of the slabs. 3 of ACI 318. 1 A Nco = projected concrete failure area of a single anchor, for calculation of strength in tension if not limited by edge distance or spacing, in. Concrete rebar calculator plan view diagram. If you can get 40' long bars the total length of your slab can be 40'. For the day to day calculations of engineers, fischer offers an efficient way to design post. No. Home foundations are typically 6" thick and have steel rebar reinforcements, vapor barriers, and foam insulation. Based on this average cost, a 10x10 concrete slab will cost $821, a 20x20 concrete slab will cost $3,284, and a 30x30 concrete slab. Slabs, Square Footings & Walls. Next, you must decide how many layers of rebar are needed for the specific application. Once you know how much rebar you need, place an order or request an estimate. 014/4 = 0. NOTE: This Calculator should be used as an estimating tool ONLY. of Main bars = (Width of Slab/Spacing) + 1. 0⋅ Φ , where Φ is the diameter of the reinforcement bar (or equivalent diameter of. 0009fy - 24)d; [ For fy > 60,000 psi] The minimum lap length for compression bars must be 12inches. Concrete volume calculator plan view diagram. 2, see D. Structural concrete. If the load is greater, rebar spacing may need to be closer. #3 rebar is ⅜” in diameter, #4 is ½” in diameter, and so on. 56. 1 provides expressions for determining. Layout of Rebar for Concrete Slabs to Estimate the Quantity of Rebar in Slab. The Rebar Weight calculator computes the total weight(w) of rebar based on the length (l) and size (s) of rebar. The ideal spacing of these rebar grids is typically around 12 to 18 inches on center, based on the expected loads and local building codes. Reinforcing steel gives slabs on grade adequate strength at the joints. Convert the weight of the bag to the volume. The deduction from the width will allow a standard 6-inch gap on each side between the ends of the rebar and the edge of the driveway concrete. A floating slab for a mobile home runs $4,600 to $14,000, while a standard 24’ x 24’, 2-car garage foundation costs $3,100 to $4,800. How do you calculate rebar spacing? Find the rebar-to-spacing multiplier with the formula M = 0. calculate the required number of bars for both directions. 2: Repeat and continue to draw complete (closed) shape. Stretch a string between two screws installed at the edge of both ends of the form boards. 666 feet. ACI 318M-14 Equation 25. Steel reinforcements might be in form of steel bars or welded wire mesh. Feet. 08 cubic yards for one concrete tube. 058 percent, which is only enough for crack containment. The weight of the concrete slab would then cause the cambered beam to deflect to a level plane at the speci-fied eleva t i o n . " Multiply the measurements from Step 1 and Step 2 together. 3) Multiply the total cubic feet needed by the 0. 3. The formula for the weight of a slab used in this calculator is: Wt = L•W•D•mD. "Guide for Concrete Floor and Slab Construction" ACI 360R-06. ACI 318M-14 Equation 25. Using the calculator, you would find that you need approximately 73339 pieces of rebar for the slab. Steel reinforcement in concrete is calculated by weight. The article handles potential approaches to design and determination of total load capacity of foundation slabs and floors. 5%. On average are required, for 10 square meter with 12cm thick slab, 19 strips of 3/8” rods (9ml each one), are 171 ml. Hello everyoneThis is just an overview on how to use the excel calculator to compute for the number of pieces of steel bars (rebar) needed for your slabs vs. 014/4 = 0. An older reinforced concrete design calculator that computes required steel area for T-beams and 1-way slabs can be found here. According to this method, you will need two rebars for a footing width of 16 inches, four rebars for a footing width of 24 inches, and so on. OR, you can add reinforcing steel. 4m mesh is required. f r om a major rebar fabri c a t o r. Generally, as a general rule for standard-sized residential slabs, 3 to 4 inches should be a sufficient distance between the rebar and the edge of the slab. 3. To calculate the total rebar needed, multiply the linear footage of your foundation (340) by the number of rebar sticks required across the. The user must enter the strengths of the concrete and the reinforcement, the unit weight of concrete, strength reduction factor for lightweight concrete, beam dimensions and slab. The Weight of Rebar in a Slab calculator computes the total weight Concrete Slab with one Rebar Grid mat of reinforcement bars (rebar) needed for a concrete slab based on the dimensions of the slab. 6 rebar spaced 4 inches on center is P = 8. Width (feet) width x12. All reinforced concrete references for slab design divide into one-way and two-way if the quotient of lb la l b l a is greater or less than a value of 2, respectively. The purpose of footings is to support the foundation and prevent settling. 4. Now, calculating the quantity of steel = total volume of concrete x density of steel x 0. 666 * 0. 6")The Total Grid Rebar Length calculator computes the total length of rebar needed for one or more mats of rebar in a concrete slab. The PT Calculator is ideal for owners, developers, contractors, architects, and engineers who need to quickly estimate quantities and concrete sizes. They are typically made of concrete with rebar reinforcement that has been poured into an excavated trench. Cut your frame to size and use nails or screws to secure your frame together. This weight is used to estimate the. Next, find the coverage of the roll. 65 and the thickness of the slab is 6 inches, M = 0. Calculate the volume you need in cubic yards. Tensile stress. As such, I would do one of two things: 1) Effectively lap the rebar with the rebar in the elements above and below. Reinforcing the slab with wire mesh or rebar can increase its strength, but it comes at an additional cost. Control the domains or regions to design under different reinforcement settings, to help minimize materials and design more. 075kN m. 25L 2, whichever is less. that is 2. ( D) Depth of Slab (e. The Rebar Calculator contains equations and data used in working with reinforcement bars (rebar) in concrete slabs. When the dimensions of a slab, wall or other form exceed the length of a single stick of rebar, it is required to overlap and tie rebar pieces to create the added length. This calculator assumes that you are using 20 foot long lengths of Rebar. The Rebar in a Circular Shaped Slab calculator estimates the total length and weight of reinforcement bars (rebar) needed for a circular shaped concrete slab. That is Ce = Cn + dia/2. It’s because of non-contact lapping has a full surface area to transfer force to the concrete. The formula for the weight of a slab used in this calculator is: Wt = L•W•D•mD. 125 x Sq.