Concrete Calculator
Find out how much concrete a flat slab, pad or footing needs. Enter the size in feet or metres, and the answer updates as you type.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Multiply length by width by depth to get the volume. Then add extra for spills, uneven ground and over-digging. Ten percent is a common choice.
The cost is the volume in cubic yards times the price you enter for one cubic yard. Prices vary, so type in the number your supplier gives you.
Worked example
A pad 12 ft long and 10 ft wide, poured 4 in deep with 10% extra, needs 1.63 yd³ of concrete. At your price, that comes to $244.44.
Questions
Is this for a slab or a footing?
Both. For a footing, which is a long narrow trench, enter its length, its width and its depth.
How much extra should I order?
Most people add 5 to 10 percent. Running short partway through a pour is the bigger problem, so a little extra is usually worth it.
Why is my supplier total different?
Suppliers often have a minimum load and a delivery charge. Ask for their price and minimum before you order.
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