Concrete Calculator

Calculate the concrete volume needed for your project. Enter dimensions in feet and inches to get cubic yards, cubic meters, and the number of concrete bags required.

Dimensions

Length (ft)

Length (in)

Width (ft)

Width (in)

Depth (ft)

Depth (in)

Concrete Needed

Cubic Feet
—

Cubic Yards
—

Cubic Meters

—

Bags Needed (includes 10% waste)

80 lb Bags

0.6 cu ft / bag

60 lb Bags

0.45 cu ft / bag

40 lb Bags

0.3 cu ft / bag

1 cubic yard = 27 cubic feet | 80lb bag ≈ 0.6 cu ft | 60lb bag ≈ 0.45 cu ft | 40lb bag ≈ 0.3 cu ft

Concrete Calculation Guide

This calculator computes the volume of concrete needed for rectangular slabs, footings, or walls. A 10% waste allowance is added to account for spillage, over-excavation, and variations in form dimensions. Always round up your bag count to the nearest whole number.

About this Calculator

The Concrete Calculator is a free, easy-to-use tool for construction, slab, yard. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.