Home project planning
Know what to buy
before you start.
Calculate materials, quantities and rough project costs for your next home improvement project — then walk into the store with an actual shopping list.
Free · No signup · Works on mobile
What are you working on?
Popular calculators
All calculators →Paint Calculator
Paint, primer and wall area for any room.
Calculate →FlooringFlooring Calculator
Area, waste and boxes for laminate, vinyl or wood.
Calculate →FlooringTile Calculator
Tiles, boxes and waste for floors or walls.
Calculate →ConstructionConcrete Calculator
Volume, bags and mix for slabs and footings.
Calculate →Paint & WallsDrywall Calculator
Sheets, screws and joint compound.
Calculate →OutdoorFence Calculator
Posts, rails and pickets for any run.
Calculate →Not sure where to start?
Tell us what you're trying to do. We'll point you at the right tools — no calculator jargon needed.
Paint a room
Walls, ceiling, primer and cans to buy
Lay new flooring
Area, boxes, underlay and waste
Tile a bathroom
Tiles, boxes, adhesive and grout
Build a patio
Concrete volume, bags and base material
Install a fence
Posts, rails, pickets and postcrete
Build a deck
Boards, joists, screws and footings
How it works
- 01
Measure
Enter room or job dimensions in metric or imperial.
- 02
Calculate
We derive areas, volumes and quantities for you.
- 03
Adjust
Change coats, waste buffer, coverage and pack size.
- 04
Buy
Get whole cans, boxes and bags — plus leftover.
Transparent calculations
Every calculator shows its formula and assumptions.
No signup
Use every tool immediately. Projects stay in your browser.
Works on your phone
Designed for measuring on site with one hand.
Free to use
The core calculators stay free.
Measurement guides
All guides →How Much Paint Do I Need?
Wall area, openings, coats and coverage — then cans, not litres.
How to Measure a Room
Floor area, perimeter, wall area and what to do with an L-shape.
How Much Waste Should I Add?
Sensible buffers by material, and why 10% is not a universal answer.
Square Feet vs Square Metres
The handful of conversions that actually come up when buying materials.