Concrete Yardage Calculator
Use this concrete yardage calculator as a quick concrete volume calculator: type in the length, width, and depth of your pour and it converts the dimensions into cubic yards, cubic feet, and cubic meters. It is the fastest way to turn site measurements into the yardage your ready-mix supplier needs.
How to use this calculator
- Measure the length, width, and depth of the area to be poured.
- Enter each value and select the matching unit — you can mix feet for the plan and inches for the depth.
- Add a waste allowance so you do not run short.
- Read the cubic yards figure; that is what ready-mix is sold by.
The formula
Concrete yardage is just volume converted into cubic yards. Multiply the three dimensions in feet for cubic feet, then divide by 27, because a cubic yard is 3 × 3 × 3 = 27 cubic feet:
Cubic yards = (Length ft × Width ft × Depth ft) ÷ 27
Worked example. A 20 ft × 12 ft pad at 5 inches deep: 5 ÷ 12 = 0.417 ft, so 20 × 12 × 0.417 = 100 cubic feet. Divide by 27 to get 3.70 cubic yards. With 10% waste you would order about 4.07 cubic yards.
Frequently asked questions
How do I calculate concrete yardage?
Measure length, width, and depth in feet, multiply them for cubic feet, then divide by 27 to get cubic yards. This concrete yardage calculator does the conversion and rounding for you.
How many cubic feet are in a cubic yard of concrete?
There are 27 cubic feet in one cubic yard. A cubic yard is a cube three feet on each side, so 3 × 3 × 3 = 27 cubic feet.
How do I convert cubic feet to cubic yards?
Divide the cubic feet by 27. For example, 54 cubic feet ÷ 27 = 2 cubic yards. To go the other way, multiply cubic yards by 27.
How much area does a yard of concrete cover?
One cubic yard covers about 81 square feet at 4 inches thick, 65 square feet at 5 inches, or 54 square feet at 6 inches. Thicker pours cover less area per yard.
Should I round concrete yardage up?
Yes. Ready-mix is usually sold by the quarter or half yard, so round up and add 5–10% waste so you are not caught short during the pour.