How To Work Out How Many Blocks Per M2? | Checkatrade
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How to work out how many blocks per m2?

When you’re embarking on a building project, one thing that often causes confusion is how many blocks you need to buy. Too few and you’ll run out partway through your construction project. Too many and you’ll be left with pallet loads of blocks to get rid of.

So, how do you work out how many blocks you need per m2?

How to work out how many blocks per m2

Luckily, it’s easy to work out how many blocks you need as they tend to come in standard sizes and there are guidelines you can follow.

Standard metric blocks in the UK are around W440mm x H215mm x 100mm. You can also get thicker blocks, but this shouldn’t impact how many you need per m2.

Typically, you’ll need 10 blocks per m2 (including 10mm mortar joints both horizontally and vertically).

However, once you’ve calculated how many blocks you need for your project, you should also add a contingency of at least 10% to allow for breakages and wastage. That way, you can avoid running out of blocks partway through your project.

How many blocks do I need overall?

When you’re building a wall, a good way to work out roughly how many blocks you need is to multiply your wall height by its length. This will tell you how many m2 your wall is.

Then, you’ll need to multiply that by 10 (remember, that’s the number of blocks you’ll need per m2).

So, the formula is:

Height of your wall (m) x length of your wall (m) x 10

Then, add 10% to the end figure as a contingency.

If you’re building multiple walls, you’ll simply need to add the number of blocks required for each wall together. Our concrete block cost calculator has you covered if you want to find out roughly how much you can expect to spend.

Ready to start your project? Save time and energy by contracting a local builder to carry out the work for you. Find out about how much that might cost by reading our guide to builder day rates.

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