Calculating tile and a halves for a plain tiled roof

Please use our online calculator to calculate an estimate of how many tile and a halves you need for the gable to gable roof. The calculator makes two calculations to calculate the amount needed:

Tile and a half calculator

Enter length of the gable end roof verge: cm

Enter the height of a plain roof tile: cm

A tile and a half is needed in every other course at the verge. The easiest way to work this out is to allow one per course on one side. This automatically allows for a tile and a half to every other course and for both roof slopes on the roof. The courses needed is calculated at:

This roof requires tile and a halves (including 5% wastage)

Please note that this is an approximate estimation based on a mathematical formula. If you need a more accurate figure we recommend that you carry out your own independent calculation


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