Concrete Weight Calculator
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Concrete weight calculator math is one line: volume × density. Normal-weight concrete runs 140 to 150 lb per cubic foot, the range the National Ready Mixed Concrete Association gives, so at 150 lb/ft³ a yard of concrete weighs 4,050 lb, a little over 2 US tons. Enter a volume or slab size to get the weight in pounds, tons and kg.
There are two ways in. Volume takes the number you already have, say from the ready-mix delivery ticket, in yd³, ft³ or m³. Slab takes the length, width and thickness, so you don't have to work out the volume somewhere else first. Then pick the type: Standard, Lightweight or Custom for your own density. The formula line on the display shows which density went in: 1 yd³ × 4,050 lb/yd³ = 4,050 lb.
How to calculate the weight of concrete
How much does concrete weigh? That depends on the mix, so the weight always comes from two numbers, volume and density:
volume (ft³) × density (lb/ft³) = weight (lb)
A cubic yard is 27 ft³. At 150 lb/ft³ that's 27 × 150 = 4,050 lb. Divide by 2,000 for US tons: 2.025, shown as 2.03. In kilograms it's 1,837 kg.
Any weight calculator for concrete works this way; only the density changes. We use the heavy end of each range, so the estimate leans heavy.
Don't have the volume yet? The concrete calculator gives cubic yards for slabs, footings, round forms and steps. Or enter the size here with Slab.
How much does a concrete slab weigh?
Switch to Slab and it becomes a concrete slab weight calculator. Use it as a concrete weight calculator by dimensions: enter length, width and thickness (in inches), plus Quantity for identical slabs. You can type 12' 6 1/2" the way it reads on the tape.
Example, Standard:
10' × 10' × 4" = 33.33 ft³ × 150 lb/ft³ = 5,000 lb
That's 2.50 US tons, or 2,268 kg. Switch the type to Lightweight and the same slab comes to 3,833 lb: 1.92 US tons, 1,739 kg. That's all a weight of concrete slab calculator does: dimensions in, pounds out.
This is the weight of the concrete itself, not how much the slab can hold.
To size the slab first, the concrete slab calculator has typical thicknesses and the volume.
Concrete weight per cubic foot and cubic yard
Concrete density decides the weight. Concrete weight per cubic foot is 150 lb for standard (normal-weight) concrete and 115 lb for structural lightweight. For concrete weight per cubic yard, multiply by 27.
How much does a cubic yard of concrete weigh? 4,050 lb at 150 lb/ft³, or 3,105 lb for lightweight.
| Type | Density, lb/ft³ | Weight per yd³ | kg/m³ |
|---|---|---|---|
| Standard | 150 | 4,050 lb | 2,403 |
| Lightweight | 115 | 3,105 lb | 1,842 |
| Reinforced (ASCE 7) | 150 | 4,050 lb | 2,403 |
Standard and Lightweight are the top of the ranges the National Ready Mixed Concrete Association gives: 140 to 150 lb/ft³ for normal-weight concrete, 90 to 115 lb/ft³ for structural lightweight. Reinforced is the value ASCE 7 lists for reinforced stone concrete in its table of minimum design densities. In metric the type labels read Standard ≈ 2,400 kg/m³ and Lightweight ≈ 1,840 kg/m³, the rounded NRMCA figures; the result itself uses the exact value.
Lightweight concrete weight is 115 lb per cubic foot here: a yard comes to 3,105 lb, or 1.55 US tons. If the mix sheet gives another figure, lighter or heavier, enter it in Custom. The field takes 20 to 400 lb/ft³.
Weight in pounds, tons and kilograms
The display shows three units at once. Pounds are for the math, US tons for the truck or trailer, kg for metric specs. The conversions are the exact definitions in NIST Handbook 44: 1 lb = 0.45359237 kg, 1 US ton = 2,000 lb.
The weight of concrete in kg is already on the display, under pounds and tons. With the site switched to metric, kg becomes the big number, with metric tons and pounds below it and no US tons:
1 m³ × 2,403 kg/m³ = 2,403 kg — 2.40 t · 5,297 lb
The switch doesn't change the weight. 1 yd³ is 4,050 lb = 1,837 kg in either mode.
Weighing gravel, topsoil or sand in tons? The cubic yard calculator handles those materials.
What's next
Got the weight but still need the order? The concrete calculator weight line shows the same 5,000 lb for the 10' × 10' × 4" slab, next to the cubic yards to order. Mixing from bags? The concrete bag calculator counts the bags for the same volume.
FAQ
How much does a yard of concrete weigh?
About 4,050 lb, or 2.03 US tons (1,837 kg), for standard concrete at 150 lb/ft³. Lightweight at 115 lb/ft³ comes to 3,105 lb, or 1.55 US tons.
How much does a cubic foot of concrete weigh?
150 lb (68 kg) for standard concrete, the top of the 140–150 lb range NRMCA gives. Structural lightweight is 115 lb (52 kg).
How much does 1 m³ of concrete weigh in kg?
2,403 kg, about 2.4 t, at 150 lb/ft³; NRMCA rounds the weight of concrete per cubic meter to 2,400 kg. Lightweight concrete is 1,842 kg per m³.
How much does reinforced concrete weigh?
ASCE 7 lists reinforced stone concrete at 150 lb/ft³, the same as Standard: 4,050 lb per yard. Plain concrete is 144 lb/ft³ there, or 3,888 lb per yard. If your drawings give a higher density for heavily reinforced work, enter it in Custom.
Results are estimates based on the densities above. Check the weight against your supplier's mix data before you rely on it.