Concrete calculator
Calculate the volume of concrete needed for slabs, walls, columns, footings and round piers. Results include cubic yards and ready-mix truck count.
Inputs
Results
Volume (net)
Enter your measurements to see the result
cubic metres (m³)
With 10% waste
—
m³
Cubic yards
—
yd³
Ready-mix trucks
—
@ 6m³ / truck
Litres
—
L
⚠ Estimates are for material planning only. Always order 5–10% extra. Consult an engineer for structural work.
Related guides
Frequently asked questions
How do I calculate concrete volume?
Multiply length × width × depth to get the volume in cubic metres. For round columns, use π × radius² × height. Always add 5–10% extra for waste and uneven subgrade.
How many cubic yards of concrete do I need?
Convert cubic metres to cubic yards by multiplying by 1.308. For example, 3 cubic metres equals approximately 3.92 cubic yards.
How many trucks of concrete do I need?
A standard ready-mix truck carries about 6 cubic metres (8 cubic yards). Divide your total volume by 6 and round up to get the number of trucks needed.
How much waste allowance should I add for concrete?
A 5–10% waste allowance is typical for most slabs and footings to account for spillage, uneven excavation, and minor measurement errors.