How to use the tile & grout calculator
This calculator helps you estimate tile counts and grout joint-fill volume. It is intended for quantity takeoffs, early budgets and checks against a measured schedule. Start with the dimensions or quantities for one clearly defined item of work. Enter values in the units shown beside each field; millimetres and metres are not interchangeable.
Tile counts conservatively use tile face area without credit for joints. Grout output is wet joint volume, not product mass. Use manufacturer density and coverage guidance to order bags. Adhesive is excluded.
Worked example
20 m² covered with 600 mm square tiles requires 56 tiles before waste, or 59 tiles with a 5% allowance.
Before you order
Compare the result with your drawings and supplier information. Keep the original net quantity separate from allowances, and round purchasing quantities only at the ordering stage. Check whether delivery, labour and related materials belong elsewhere in your estimate. If the drawing or specification changes, update the inputs and record the revised basis instead of reusing an earlier total.
For the concepts behind this calculation, read Wastage Factor, Takeoff (Quantity Takeoff), Unit Rate.