Use these free calculators to organise a project budget and estimate paint quantity. The numbers come from your own inputs, so you can change assumptions as your plans develop.
Project budget planner
Enter your quoted or planned amounts below. The planner adds a contingency to the subtotal. It is a worksheet, not a market price estimate; check the scope, VAT basis and exclusions of every quote.
Enter figures on the same VAT basis. This sums your inputs; it does not estimate market prices or replace a written quote.
Paint calculator
For four straight walls of a rectangular room. This excludes the ceiling and allows no extra for texture, wastage or unusually porous surfaces. Use the coverage stated by the paint manufacturer.
How to use the results
For the budget, include all known costs and keep open allowances visible. If a quote omits preparation, waste or finishing, enter a realistic separate allowance before comparing it with another quote. Our home renovation checklist explains how to write a scope and compare proposals.
For paint, measure the wall lengths and height in metres. Deduct the total area of doors and windows, select the number of coats and copy the coverage from the tin. The tool estimates litres for rectangular walls; buy to suit the manufacturer’s pack sizes and allow for your surface condition.