Concrete volume calculator
Choose the shape and enter its dimensions. Use the mixed concrete yield per bag, not its dry weight, to estimate whole bags.
Enter your measurements, then calculate.
Method and limitations
Slab or rectangular strip footing: volume = length × width × thickness. Solid round column: volume = π × (diameter ÷ 2)² × height. Bags = volume ÷ yield per bag, rounded up, as in QUIKRETE’s calculator. Enter the yield from your bag; no density, bag size or waste factor is assumed. No allowance for uneven excavation, losses or reinforcement; this is a quantity estimate, not structural sizing. NIST Appendix C: 1 L = 0.001 m³; 1 ft = 0.3048 m; 1 ft³ = 0.028316846592 m³; 1 yd = 0.9144 m, hence 1 yd³ = 0.764554857984 m³. QUIKRETE: https://www.quikrete.com/calculator/main.asp NIST: https://www.nist.gov/system/files/documents/2023/01/30/appc-23-HB44.pdf