Measure areas that you're tiling.
Choose recommended grout width and wastage.
Check quantities and tile.
A simple app to help you calculate the amount of tiles, adhesive and grout you're going to need for your tiling jobs. Input the tile dimensions and the grout width you need. When you've input the tiling area the app will calculate what you'll need. It can include a suggested amount for cutting/wastage. Please confirm with your supplier before you buy.