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Free Home Improvement & Appliance Calculators
Work out exactly what your project needs, concrete, paint, flooring, fencing and more, with calculators that show their formulas and worked examples. No sign-up, free.
Concrete Calculator → · Paint Calculator → · Tile Calculator → · AC BTU Calculator → · Electricity Cost Calculator → · Mulch Calculator →
Browse by category
Top tools in each category, the full set of 46 is on the calculators hub.
Yard & Outdoor
15 toolsConcrete Calculator
Volume, bags and cost for slabs, footings and post holes.
Mulch Calculator
Bags or bulk yards for garden beds, with a depth guide.
Gravel Calculator
Tons and cubic yards for driveways, paths and bases.
Topsoil Calculator
Cubic yards and bags for raised beds and new lawns.
Fence Calculator
Posts, rails and pickets for any fence length.
Deck Calculator
Boards, joists, posts and screws for your deck size.
All 15 Yard & Outdoor calculators →
Floors, Walls & Roof
10 toolsFlooring Calculator
Boxes of laminate, vinyl or hardwood, waste included.
Paint Calculator
Gallons and coats for rooms and whole houses.
Tile Calculator
Tiles, grout and adhesive for floors and walls.
Wallpaper Calculator
Rolls needed, with pattern-repeat allowance.
Drywall Calculator
Sheets, mud and screws for walls and ceilings.
Roofing Calculator
Shingles, bundles and squares for any roof pitch.
All 10 Floors, Walls & Roof calculators →
Appliances, HVAC & Energy
8 toolsRepair vs Replace Calculator
Repair or replace? A clear verdict from the costs.
Electricity Cost Calculator
Running cost of any appliance, per hour, month or year.
AC BTU Calculator
The right air-conditioner size for your room.
Solar Panel Calculator
Panels, system size, cost and payback for 2026.
Water Heater Size Calculator
The tank size and first-hour rating your home needs.
Heating Cost Calculator
What electric, heat pump and gas heating cost to run.
All 8 Appliances, HVAC & Energy calculators →
Measure, Convert & Costs
9 toolsSquare Footage Calculator
Area of rooms and shapes, rectangles, triangles and circles.
Cubic Yard Calculator
Volume in yards, cubic feet and metres for bulk materials.
Board Foot Calculator
Lumber volume and cost from board dimensions.
Cost per Square Foot Calculator
Compare quotes and materials at a fair per-foot rate.
Unit Converters
Square feet to m², gallons to litres and more, both ways.
Remodel Budget Calculator
Room-by-room remodel budgets with contingency built in.
All 9 Measure, Convert & Costs calculators →
Every calculator shows its formula and a worked example you can check by hand.
Free to use, no sign-up, in imperial and metric.
46 calculators and 25 guides, linked to each other.
Estimates only, see our Disclaimer.
Frequently asked questions
Are these calculators really free?
Yes, all 46 calculators are completely free to use, with no sign-up, no account and no limits.
How accurate are the results?
They use the same formulas tradespeople use, with waste allowances built in. Treat the numbers as solid estimates for budgeting and ordering, and have any structural work checked by a professional.
Can I switch between imperial and metric?
Yes, every calculator has a unit toggle, so you can work in feet and inches or metres and centimetres.
Which countries are the prices for?
Electricity prices are built in for the US, UK, Canada and Australia. The material quantities themselves work anywhere in the world.
What should I calculate first for a renovation?
Start with the biggest material cost, usually concrete, flooring or paint, then work down the list. Our guide to calculating building materials for a site walks through the full order step by step.