Free tools for home projects
Good projects start
with a clear estimate.
How much paint, flooring, tile or paneling will you need? Turn your measurements into a practical materials plan, with the calculations explained.
- 19 free calculators
- No account needed
- Feet & metres
An example rectangular room. Start with its area, then check material coverage and add the allowance your project needs.
Calculate your room areaOne project. A useful starting point.
What are you working on?
The toolbox
A calculator for the next step.
Choose a task below. Every tool includes its formula, an example and the assumptions behind your estimate.
Measurements
Start with room, wall, and surface measurements before estimating materials.
Room Area Calculator
Calculate room area or flat ceiling area from length and width.
Wall Area Calculator
Calculate total wall area from room length, width, and wall height, with optional door and window deductions.
Curtain Size Calculator
Estimate total curtain width, curtain drop, and optional width per panel from window size, fullness ratio, and allowances.
Blinds Size Calculator
Estimate blind width and blind height for inside or outside mount using window measurements and optional allowances.
Paint & wall coverings
Estimate wall finishes such as paint and wallpaper from measured areas.
Paint Calculator
Estimate how much paint you may need for walls based on area, coats, coverage, and waste allowance.
Primer Calculator
Estimate primer quantity from surface area, primer coats, coverage, and optional waste allowance.
Wallpaper Calculator
Estimate wallpaper rolls using a drop-based method that accounts for roll length, roll width, room height, pattern repeat, and waste allowance.
Tile & grout
Plan tile quantities and related materials for floors and walls.
Tile Calculator
Estimate the number of tiles needed from area, tile size, waste allowance, and optional tiles per box.
Tile Adhesive Calculator
Estimate how many tile adhesive bags you need from tiled area, coverage per bag, and waste allowance.
Grout Calculator
Estimate grout weight from tiled area, tile size, joint width, joint depth, and waste allowance.
Flooring & carpet
Estimate flooring packs, carpet area, and related floor-covering quantities.
Carpet Calculator
Estimate carpet area from room length, room width, and optional waste allowance.
Flooring Pack Calculator
Estimate how many flooring packs you need from floor area, pack coverage, and waste allowance.
Laminate Flooring Calculator
Estimate laminate flooring planks from room size, plank size, expansion gap, waste allowance, and optional planks per pack.
Concrete & materials
Estimate bulk home project materials such as concrete as this section expands.
Outdoor & landscaping
Estimate outdoor home project materials such as gravel, mulch, and simple landscaping quantities.
Gravel Calculator
Estimate gravel volume for a rectangular path, driveway section, garden bed, or outdoor home project.
Mulch Calculator
Estimate mulch volume for a rectangular garden bed, planting area, or outdoor home project.
Fence Calculator
Estimate fence panels and posts for a simple straight fence run using total length, gate width, panel length, and waste allowance.
Trim & finishings
Plan finishing materials such as skirting, baseboards, and trim.
Understand your estimate
Measure twice.
Plan with confidence.
These tools are a starting point for buying and planning. Real projects have corners, cuts, openings and product-specific coverage. Check the assumptions with your result and confirm the final order against your product instructions.
Read our calculation approach