50 Specialist Calculators
Instant Results - No Sign-Up
Free to Use
Professional tools for serious builders

A full bathroom refit consistently ranks among the highest-return home improvements in the UK - but it is also one of the most material-intensive jobs relative to room size. Getting tile quantities wrong mid-job is particularly costly: running short means a potential batch mismatch, while over-ordering on large format porcelain can waste hundreds of pounds. This project kit covers every material stage of a bathroom refit in order, from wall and floor tiles through adhesive, waterproofing and plasterboard, right through to paint for the ceiling and any untiled wall sections.

Enter your bathroom dimensions and tiled area height once and the kit pre-fills all 6 calculators with your measurements. Whether you are doing the work yourself or managing a trade, having accurate quantities upfront means a tighter quote, fewer site visits and no surprises at the merchant counter.

What this kit covers

Work through these 6 calculators in order. Enter your bathroom dimensions and tiled area once - each calculator opens pre-filled with your measurements.

1
Ceramic & Porcelain Tile Calculator
Calculate the number of tiles needed for your bathroom walls and floor. Enter the tiled area and tile size - the calculator includes cutting waste.
Open calculator
2
Adhesive & Grout
Work out bags of tile adhesive and grout for your tiled areas, based on coverage rates and joint width.
Open calculator
3
Waterproof Coating
Calculate tanking slurry or waterproof membrane quantities for wet areas around the shower, bath and floor.
Open calculator
4
Plasterboard (wet area boards)
If any walls need new boards before tiling, calculate moisture-resistant plasterboard sheets, screws and jointing materials.
Open calculator
5
Render & Plaster
For any plastered walls or ceiling, calculate bags of bonding, browning or multi-finish plaster needed.
Open calculator
6
Interior Paint
Calculate bathroom paint (moisture-resistant) for the ceiling and any non-tiled walls.
Open calculator

Start this project

Enter your bathroom dimensions and we'll create a project with pre-filled starting points for each calculator.

How high up the walls tiles will go

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No free project slots

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