How Much Do I Need?
Simple calculators for figuring out how much material, space, or quantity you need.
Calculators
Home and DIY
Paint, wallpaper, flooring, tiles, drywall and insulation for rooms, floors and walls.
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How much paint do I need?
Paint Calculator Gallons or litres of wall paint for a room, after subtracting doors and windows. -
How much wallpaper do I need?
Wallpaper Calculator Rolls of wallpaper for a room or feature wall, allowing for pattern repeat. -
How much flooring do I need?
Flooring Calculator Square footage and boxes of laminate, vinyl or wood flooring for a room. -
How many tiles do I need?
Tile Calculator Number of tiles and boxes for a floor or wall, allowing for grout joints and cuts. -
How many sheets of drywall do I need?
Drywall Calculator Sheets of drywall or plasterboard for a room’s walls and ceiling. -
How much insulation do I need?
Insulation Calculator Packs of insulation batts or rolls for an attic or walls, and depth for an R-value.
Garden and landscaping
Mulch, soil, gravel, lawns, fences, decks, paving, walls and pools.
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How much mulch do I need?
Mulch Calculator Cubic yards or bags of mulch for a garden bed at the depth you want. -
How much soil do I need?
Soil Calculator Cubic feet, cubic yards or bags of soil to fill a raised bed or garden bed. -
How much gravel do I need?
Gravel Calculator Cubic yards and tons (or m³ and tonnes) of gravel for a driveway, path or bed. -
How much grass seed or sod do I need?
Grass Seed and Sod Calculator Pounds or kilograms of grass seed, or rolls and pallets of sod (turf), for a lawn. -
How much fencing do I need?
Fence Calculator Posts, panels or pickets and rails, and concrete for the post holes. -
How many deck boards do I need?
Deck Board Calculator Decking boards and screws for a rectangular deck, allowing for gaps and waste. -
How many pavers do I need?
Paver Calculator Pavers or paving slabs for a patio or path, plus base gravel and bedding sand. -
How many retaining wall blocks do I need?
Retaining Wall Block Calculator Blocks, caps and gravel for a segmental retaining wall or garden wall. -
How much water does my pool hold?
Pool and Water Tank Volume Calculator Gallons or litres of water in a pool, pond or tank, and how long it takes to fill.
Building
Concrete, bricks and roofing.
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How much concrete do I need?
Concrete Calculator Cubic yards, cubic feet or bags of concrete for a slab, patio or pad. -
How many bricks do I need?
Brick Calculator Number of bricks for a wall, allowing for mortar joints and waste. -
How many bundles of shingles do I need?
Roofing Shingle Calculator Roof area, squares and bundles of shingles from the footprint and pitch.
Moving house
Boxes and the right size of truck.
Parties and events
Food, drinks and supplies for your guests.
Digital
Storage space and internet speed and data.
No calculator matches “”. Try a material like “paint” or “gravel”, or browse every calculator.
How it works
- Pick what you're working out. Search above or choose a calculator.
- Enter a few measurements in feet and inches or metres and centimetres. You can mix units.
- Read the answer. You get the exact quantity, a sensible amount to buy, and the working behind both.
Estimates you can check
Standard formulas
Every calculator uses the same area and volume formulas a builder or supplier would use, and shows each step with your numbers.
Exact amount and amount to buy
You see the mathematical quantity separately from the amount to buy, which adds an adjustable allowance for waste and rounds up to real product sizes.
Private and fast
No accounts or sign-ups. Calculations happen on your device, nothing you type is sent anywhere, and pages keep working even if you lose your connection.