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Roof Slate Calculator

How Much Roof Slate Do I Need?

This is a question we hear all the time, so we designed a very simple roof slate calculator to help you gauge how many slates you need for your roof. The general rule of thumb – and for this example we’ll use the most common size of 500×250 or “20×10” – is for every 1 meter squared of roof, you need 21 slates.