Concrete Weight Calculator
Calculate the weight of concrete slabs, footings, and columns by volume or dimensions. Supports standard, reinforced, and lightweight concrete in kg, lbs, and tons.
Concrete Weight Calculator
Calculate weight by dimensions or volume
Select the unit for all dimensions above
Standard is most common for slabs and patios
Choose your preferred unit for the final weight
Your Concrete Weight
Volume, density and bag equivalents
Enter your slab dimensions and select a concrete type, then click Calculate to see the total weight and volume.
Concrete Weight Benchmarks
Quick reference guide for the density and weight of different concrete types.
| Concrete Type | Density (kg/m³) | Density (lbs/ft³) | Weight per m³ | Weight per yd³ |
|---|---|---|---|---|
| Standard | 2400 | 150 | 5,291 lbs | 4,050 lbs |
| Reinforced | 2500 | 156 | 5,511 lbs | 4,212 lbs |
| Lightweight | 1800 | 112 | 3,968 lbs | 3,024 lbs |
Concrete Weight FAQ
Everything you need to know about concrete density, volume, and weight calculations.
The weight of concrete depends on its type and density. Standard concrete weighs approximately 2400 kg per cubic meter (150 lbs per cubic foot). Reinforced concrete is slightly heavier at about 2500 kg/m³ (156 lbs/ft³) due to the steel rebar. Lightweight concrete, used for reducing structural load, weighs around 1800 kg/m³ (112 lbs/ft³).
To calculate the weight of a concrete slab, first find its volume by multiplying the length, width, and thickness. Ensure all measurements are in the same units. Then, multiply the volume by the density of the concrete. For standard concrete, multiply the volume in cubic meters by 2400 to get the weight in kilograms, or multiply cubic feet by 150 to get pounds.
The density of reinforced concrete is typically 2500 kg/m³ (156 lbs/ft³ or 4212 lbs/yd³). This is slightly higher than standard concrete (2400 kg/m³) because of the embedded steel reinforcement bars (rebar), which are much denser than the concrete matrix itself.
To estimate the number of bags needed, calculate the total weight of your project and divide by the bag weight. For example, if your slab requires 1000 kg of concrete, you would need 40 bags of 25kg concrete mix, or 50 bags of 20kg mix. This calculator automatically provides bag equivalents based on your calculated volume and weight.
Yes, freshly mixed (wet) concrete is heavier than cured (dry) concrete due to the water content. However, the weights used in construction and structural calculations (like 2400 kg/m³) typically refer to the cured, hardened density. The water chemically binds with the cement during hydration, so the overall mass remains largely the same, but excess mixing water evaporates, slightly reducing the final weight.
A cubic yard of standard concrete weighs approximately 4050 pounds (1837 kg). This is calculated by multiplying the density of standard concrete (150 lbs/ft³) by 27, since there are 27 cubic feet in a cubic yard. For reinforced concrete, a cubic yard weighs about 4212 pounds.