Welcome to our free material calculators for home improvement and household appliances. Each tool shows the formula it uses, explains the result in plain language, and works without any sign-up — just enter your own numbers and get a clear, independent answer you can check for yourself.
Planning a whole project rather than a single job? Read our guide on how to calculate building materials for a site — it walks through measuring every part of the job, adding waste allowances and turning the numbers into an order list.
Yard & Outdoor
12 toolsConcrete Calculator
Volume, bags and cost for slabs, footings and post holes.
Popular🌾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.
🟫Paver Calculator
Pavers plus sand and gravel base for patios and paths.
🌿Sod Calculator
Rolls and pallets of turf for an instant new lawn.
🏗️Retaining Wall Calculator
Blocks, caps and backfill gravel for garden walls.
🏊Pool Volume Calculator
Gallons and litres in rectangular, round and oval pools.
💧Irrigation Calculator
Sprinkler and drip run times, and gallons per week.
🌲Bark Mulch Calculator
Litres and bags of bark for UK beds and borders.
Floors, Walls & Roof
8 toolsFlooring Calculator
Boxes of laminate, vinyl or hardwood, waste included.
Popular🎨Paint Calculator
Gallons and coats for rooms and whole houses.
Popular🔲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.
🌡️Insulation Calculator
Depth, bags and R-value for attics and walls.
🧱Plasterboard Calculator
UK sheets for walls and ceilings, worked out in metres.
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.
💡LED Savings Calculator
Savings from switching your bulbs to LED, with payback.
🧊Fridge Running Cost Calculator
What your fridge costs per day, month and year.
Measure, Convert & Costs
6 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.