What is the correct batch ratio for mixing concrete?

The ratio of cement to river sand and stone determines the strength of the concrete. Here is a cheat sheet to ensure that you have the right strength of concrete for the job.

Your Tools:

• Bucket / Tin
• Spade
• Wheelbarrow

Large Batches

Low-strength concrete suitable for house foundations.

To make 1 cubic metre of concrete, you will need: 5 ½ bags cement + 0.75 cubic metres sand + 0.75 cubic metres stone.

Medium-strength concrete suitable for domestic floors, footpaths and driveways.

To make 1 cubic metre of concrete, you will need: 7 bags cement + 0.70 cubic metres sand + 0.70 cubic metres stone.

High-strength concrete suitable for precast concrete, heavy-duty floors.

To make 1 cubic metre of concrete, you will need: 10 bags cement + 0.65 cubic metres sand + 0.65 cubic metres stone.

Small Batches

Use containers such as buckets, drums or tins. Use the same size container for measuring all the materials in a batch.