DIY & Building Calculators
Free tools to help you plan materials, estimate costs, and avoid waste on your home improvement projects.
Paint Calculator
Enter your room dimensions, number of doors and windows, and coats required. Get the exact number of litres and tins you need to buy.
Calculate paintPlastering Calculator
Work out how many bags of plaster you need for bonding, skim coat, or one-coat finishes. Includes coverage rates and cost estimates.
Calculate plasterWallpaper Calculator
Find out how many rolls of wallpaper you need. Accounts for pattern repeats, standard UK roll sizes, doors and windows.
Calculate wallpaperPlanning Your DIY Project
Getting the right amount of materials is one of the most important steps in any home improvement project. Buy too little and you face a frustrating trip back to the shop, potentially with a different batch number that does not quite match. Buy too much and you waste money and cupboard space on leftover tins and bags.
Our DIY calculators use industry-standard coverage rates from leading UK manufacturers. They account for the variables that matter — room dimensions, doors and windows, number of coats, pattern repeats, and plaster depth — so you can order with confidence.
Related Sites You Might Find Useful
We also recommend these specialist calculator sites for more detailed project planning:
- tilecalculator.co.uk — Tile quantity calculators for walls and floors
- flooringcalculator.co.uk — Laminate, vinyl, and carpet estimators
- diycalculator.co.uk — General building calculators for concrete, bricks, and aggregates