Use this for rectangular pads, walls, curbs, steps, and other simple prisms. Break irregular work into measurable shapes and add their volumes.
01 / Formula
How this is calculated
Cubic yards = (length ft × width ft × thickness in ÷ 12) ÷ 2702 / Assumptions
What the estimate assumes
- ✓The measured shape is rectangular.
- ✓Thickness is uniform across the full area.
- ✓Waste is applied after theoretical volume and remains visible.
03 / Worked example
See the math in context
A 12 × 10 ft pad at 4 inches thick contains 40 cubic feet, or 1.48 cubic yards before waste.
04 / Guidance
Measure the formed dimensions
Use the dimensions concrete will actually occupy, not a nominal plan size if excavation or forms differ. For stepped or irregular work, calculate each section separately.
05 / Guidance
Order units and truckloads
Ready-mix is commonly discussed in cubic yards in the U.S. Confirm order increments, minimum-load policies, and delivery access directly with the supplier.
Questions
Frequently asked
Should I order exactly the calculated amount?+
Usually no. Excavation variation, form dimensions, spillage, and uneven subgrade can increase actual volume. Use the editable waste allowance and discuss minimum loads and order increments with the supplier.
How many cubic feet are in a cubic yard?+
There are exactly 27 cubic feet in one cubic yard. Divide cubic feet by 27 to convert to cubic yards.
Does this replace a structural design?+
No. These tools estimate material quantity only. A qualified professional and applicable plans, codes, site conditions, reinforcement requirements, and manufacturer instructions govern the project.
Sources