Concrete Calculator
Calculate the amount of concrete needed for your project. Enter dimensions to get volume estimates in cubic yards and bags of concrete.
Calculator implementation coming soon. This calculator is being developed and will be available shortly.
This calculator estimates concrete volume for common construction projects including slabs, footings, and columns. Get results in cubic yards and the number of concrete bags needed.
How It Works
Concrete Volume Formula
Volume (cubic yards) = (L × W × D ÷ 27)Volume in cubic yards equals length times width times depth (in feet), divided by 27.
Convert depth from inches to feet by dividing by 12
Multiply length × width × depth (in feet) to get cubic feet
Divide by 27 to convert cubic feet to cubic yards
Important Notes:
- •One cubic yard equals 27 cubic feet
- •Standard 80 lb bag of concrete yields approximately 0.6 cubic feet
- •Standard 60 lb bag of concrete yields approximately 0.45 cubic feet
- •Standard 40 lb bag of concrete yields approximately 0.3 cubic feet
Worked Example
A concrete slab 10 feet by 10 feet, 4 inches thick, using 80 lb bags.
Inputs:
- shape:slab
- length:10
- width:10
- depth:4
- bag Size:80
Result:
You'll need approximately 1.24 cubic yards of concrete, which is about 56 bags of 80 lb concrete mix.
Who Is This Calculator For?
- DIYers
- contractors
- homeowners
- construction workers