September 18, 2026

Concrete Volume Calculator

By Admin

Concrete & Materials

Concrete Volume Calculator

Estimate net and order concrete volume for rectangular concrete members such as slabs, beams, walls, footings, and columns. Supports independently selected SI and US customary dimension units, multiple identical members, and a configurable waste allowance.

v1.0.0

Inputs

Reference / project basis Select the general specification basis for the project. This selection is informational and does not alter the geometric volume calculation. Concrete member type Select the member being estimated. The current Formula Builder calculation assumes a rectangular or prismatic member. Length selected length unit Enter the member length. The value must be greater than zero. Length unit Select the unit used for the member length. Width selected width unit Enter the member width. For a wall this may represent wall thickness or another applicable rectangular dimension depending on orientation. Width unit Select the unit used for the member width. Depth / thickness / height selected depth unit Enter the third member dimension. For slabs use thickness; for beams use depth; for rectangular columns this may be the second cross-sectional dimension or height depending on how the other dimensions are entered. Depth unit Select the unit used for the depth, thickness, or height. Number of identical members Enter the number of identical concrete members. Use 1 for a single slab, footing, wall segment, beam, or other member. Waste / contingency allowance % Enter an allowance for waste, spillage, dimensional variation, over-excavation, pumping losses, or ordering contingency as appropriate for the project.

Results

Net concrete volume — m3 Geometric concrete volume before applying the waste or contingency allowance.

Concrete volume including waste — m3 Recommended estimated volume after applying the selected waste or contingency percentage.

Waste / contingency volume — m3 Additional concrete represented by the selected waste or contingency percentage.

Concrete volume including waste — yd3 Total estimated concrete volume expressed in cubic yards.

Concrete volume including waste — ft3 Total estimated concrete volume expressed in cubic feet.

Concrete volume including waste — L Total estimated concrete volume expressed in litres.

Formula, assumptions & references

Formula notes

Net volume for a rectangular or prismatic concrete member = length x width x depth x quantity.
All entered dimensions are internally converted to metres before the volume calculation.

Total order volume = net volume x (1 + waste percentage / 100).
Waste volume = total order volume - net geometric volume.
1 m3 = approximately 1.307950619 yd3.
1 m3 = approximately 35.31466672 ft3.
1 m3 = 1000 litres.
Worked example: a slab 5 m long, 4 m wide, and 150 mm thick has a net volume of 3.000 m3. With 5 percent waste, the estimated order volume is 3.150 m3, approximately 4.120 yd3.

QA test 1: length 5 m, width 4 m, depth 150 mm, quantity 1, waste 5 percent => net volume 3.000 m3; waste 0.150 m3; total 3.150 m3; approximately 4.120 yd3.
QA test 2: length 20 ft, width 10 ft, depth 6 in, quantity 1, waste 10 percent => net volume approximately 2.832 m3; waste approximately 0.283 m3; total approximately 3.115 m3; approximately 4.074 yd3.
QA test 3: beam length 6000 mm, width 300 mm, depth 500 mm, quantity 8, waste 3 percent => net volume 7.200 m3; waste 0.216 m3; total 7.416 m3; approximately 9.700 yd3.

QA test 4: rectangular columns 3 m x 0.4 m x 0.4 m, quantity 10, waste 2 percent => net volume 4.800 m3; waste 0.096 m3; total 4.896 m3.
QA test 5: footings 2 m x 2 m x 0.5 m, quantity 4, waste 0 percent => net volume 8.000 m3; total volume 8.000 m3; approximately 10.464 yd3.
QA test 6: length 12 ft, width 8 ft, depth 4 in, quantity 3, waste 5 percent => net volume approximately 2.718 m3; waste approximately 0.136 m3; total approximately 2.854 m3; approximately 3.733 yd3.

Assumptions

The member is treated as a rectangular prism with uniform dimensions.
Dimensions entered by the user represent the actual concrete dimensions to be placed.
Quantity represents identical members having the same dimensions.
Openings, blockouts, embedded voids, rebates, haunches, chamfers, irregular profiles, and other deductions are not automatically included.

The waste percentage is applied to the total net geometric volume after multiplying by the member quantity.
The calculator does not determine an appropriate waste percentage for a project. The user should select an allowance based on construction method, placement conditions, project specifications, batching and ordering practices, tolerances, and experience.
For irregular members, divide the member into simpler geometric shapes and calculate the component volumes separately.

For circular columns, piles, pipes, cylinders, conical members, trapezoidal sections, and other non-rectangular geometry, use a calculator specifically designed for that geometry.
The reference or project basis selection does not modify the geometric volume result.
Concrete ordering practices, minimum order quantities, truck capacities, batching tolerances, yield, over-excavation, placement losses, and supplier requirements should be checked separately.

References

ACI 301, Specifications for Concrete Construction.
ACI 318, Building Code Requirements for Structural Concrete.
ASTM C94/C94M, Standard Specification for Ready-Mixed Concrete.
EN 206, Concrete - Specification, performance, production and conformity.
Applicable structural drawings, approved construction drawings, bills of quantities, project specifications, local standards, and concrete supplier requirements.

This calculator is a geometric concrete quantity estimator. It does not replace approved construction drawings, quantity takeoff procedures, project specifications, concrete supplier requirements, or professional engineering judgement. Verify all dimensions, units, member quantities, deductions, waste allowances, and ordering requirements before purchasing or placing concrete.