How to Estimate a Concrete Slab
Measure the slab length and width, then enter the planned thickness. The calculator converts each dimension to feet, calculates cubic feet, and converts the volume to cubic yards.
Formula
Cubic yards = Length × Width × Thickness ÷ 27
Waste Allowance
A small allowance can help account for uneven subgrade, form variations, spillage, and measurement error.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology