Free Concrete Footing Calculator
Calculate concrete needed for continuous footings. Enter the footing length, width, and depth to determine cubic yards of concrete required.
feet
inches
inches
Volume (Cubic Yards)
2.06 cu yd
Volume (Cubic Feet)55.56 cu ft
With 10% Waste2.26 cu yd
Volume (Cubic Yards) vs Footing Length
How to Calculate Concrete for Footings
Formula
Volume = Length (ft) x Width (ft) x Depth (ft)
Convert width and depth from inches to feet by dividing by 12, then divide total cubic feet by 27 for cubic yards. Footings are typically 20 inches wide and 8 inches deep for residential construction, but always follow local building codes.
Example Calculation
A continuous footing that is 50 ft long, 20 inches wide, and 8 inches deep.
- 01Width in feet: 20 / 12 = 1.667 ft
- 02Depth in feet: 8 / 12 = 0.667 ft
- 03Volume = 50 × 1.667 × 0.667 = 55.56 cu ft
- 04Cubic yards = 55.56 / 27 = 2.06 cu yd
- 05With 10% waste = 2.06 × 1.10 = 2.26 cu yd
Frequently Asked Questions
Learn More
How to Calculate Concrete Needed for Any Project
Learn how to calculate the exact amount of concrete needed for slabs, footings, columns, and other projects. Covers volume formulas, waste factors, and ordering tips.