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Concrete Quantity Calculator
Estimate slab concrete, an adjustable ordering allowance, and how much extra concrete a low subgrade consumes.
Example allowance only. Set this for your placement conditions.
Your Numbers
- Design volume
- 11.11 yd³
- Extra volume from low subgrade
- 0 yd³
- Volume including ordering allowance
- 11.67 yd³
Confirm the final order and load increments with your supplier.
Change any input above and these update as you type.
What this assumes
- · Uniform rectangular slab; excludes thickened edges, footings, and beams.
- · Low-subgrade depth is additional to design thickness. The ordering allowance applies once to the combined volume.
- · This estimates quantity only; slab thickness and reinforcement must follow the project design.
An estimate, not a bid. For a number you can put in front of an owner, send us the plans.