Mortar Calculator

Work out exactly how much sand and cement you'll need to mix mortar for your brickwork or blockwork.

Wall Measurements

1:4 is standard for brick laying. 1:6 is softer for repointing.

Results

Total Wall Area: 0.00 m²
Building Sand Needed: 0 x 25kg bags (or 0 bulk bag)
Cement Required: 0 x 25kg bags
Estimates allow for a 10% waste margin typical in mortar mixing and bricklaying.
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Frequently Asked Questions

What is the correct mortar mix for brickwork?

For most blockwork and brickwork in the UK, a standard general-purpose mix is 1 part cement to 4 or 5 parts building sand (1:4 or 1:5), sometimes with a plasticiser added for workability.

Why use plasticiser in mortar?

Plasticiser adds tiny air bubbles to the mix, making the mortar smoother and easier to spread on bricks. It also helps prevent cracking from frost damage during the drying process.

Can I lay bricks in the rain?

It is highly advised not to lay bricks in heavy rain. Rain can wash the cement out of the mortar joints before it sets, drastically weakening the wall and causing unsightly white efflorescence stains.

How long should mortar dry before pointing?

If you are brushing or tool-pointing, it should be done 'green'—usually 1 to 2 hours after laying when the mortar is firm but a thumbprint still leaves a mark.