Paint, wallpaper, tiles, flooring, radiators, decking, turf, gravel or concrete — enter your measurements and get an exact quantity in seconds, plus a ready-made shopping list.
Paint
Wallpaper
Tiling
Flooring
Radiator
Fence Paint
Decking
Turf
Gravel
Concrete
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You'll need approximately
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Everything you need for this job
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How much paint do I need for a room? Work out the wall area (wall length all the way around × height), subtract about 1.5 m² (16 sq ft) for each door and window, then multiply by the number of coats and divide by the paint's coverage. A standard 4 m × 3 m room with 2.4 m walls needs roughly 5 litres for two coats.
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Paint FAQs
How many coats of paint do I need?
Two coats is standard. Use three for light over dark, bold colours, or fresh plaster (where the first coat is a thinned "mist coat").
Should I round up when buying paint?
Yes — buy slightly more so you have enough for touch-ups and don't run out with a colour that's hard to match.
You'll need approximately
0 rolls
Everything you need to hang it
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How many rolls of wallpaper do I need? Measure around the room, divide by the roll width to get the number of drops, then work out how many full drops you get from one roll once you allow for wall height and any pattern repeat. A 4 m × 3 m room with 2.4 m walls needs about 7 Euro rolls of plain paper.
Wallpaper FAQs
Why does a pattern repeat need more rolls?
Each drop must line up with the last, so you waste part of every drop. The bigger the repeat, the more waste.
Roll sizes differ by country
Europe/UK rolls are 10.05 m × 53 cm; American rolls are usually sold as larger double rolls. Pick your roll size above for an accurate count.
You'll need approximately
0 tiles
Everything you need to tile
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How many tiles do I need? Work out the area to tile (length × width), divide by the area of one tile to get tiles per square metre (or foot), and add 10% for cuts and breakages. For example, 10 m² of 300 × 300 mm tiles needs about 123 tiles including wastage.
Tiling FAQs
How much wastage should I allow?
Around 10% for a straight layout, 15–20% for diagonal or herringbone patterns and small rooms with lots of cuts.
You'll need approximately
0 packs
Everything you need to lay it
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How much flooring do I need? Measure the floor area (length × width), add about 10% for cuts and wastage, then divide by the coverage of one pack (shown on the box). For example, a 20 m² room with 2 m² packs needs 11 packs including wastage.
Flooring FAQs
How much extra should I buy?
Allow about 10% for a straight lay, up to 15% for diagonal or herringbone. Keep a spare pack for future repairs.
Recommended heat output
0 BTU
Radiators that fit the job
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What size radiator do I need? Estimate the room's heat requirement from its volume (length × width × height) and its use — living rooms and bathrooms need more heat per cubic metre than kitchens. Add around 15% for large windows or poor insulation. Pick a radiator whose BTU output meets or exceeds the figure, and it's fine to go a little over.
Radiator FAQs
Is it better to go over or under on BTUs?
Slightly over. A radiator that's a little too powerful just reaches temperature sooner and idles; one that's undersized will struggle to heat the room on cold days.
How accurate is this estimate?
It's a solid rule-of-thumb guide. For a precise figure a full heat-loss survey accounts for wall construction, glazing and adjoining rooms.
You'll need approximately
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Everything you need for the garden
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How much fence paint do I need? Multiply the total fence length by its height (and by two if you're painting both sides), then multiply by the number of coats and divide by the coverage. Rough-sawn timber and the first coat soak up far more than smooth wood, so coverage is lower than for wall paint — around 6 m² per litre.
Fence & shed FAQs
Why is coverage lower than wall paint?
Bare, rough or previously untreated timber is thirsty — the first coat especially. Always allow extra for a first coat on new fencing.
Brush, roller or sprayer?
A sprayer is fastest for large runs, a brush works paint into the grain best. Many people spray then "back-brush" the first coat.
You'll need approximately
0 boards
Everything you need to build it
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How many decking boards do I need? Divide the deck width by the board width plus the gap to get the number of rows, then work out how many board lengths make up each row. Add about 10% for cuts and wastage. A 5 m × 4 m deck using 3.6 m × 144 mm boards needs roughly 60 boards plus joists.
Decking FAQs
What gap should I leave between boards?
Usually 5–6 mm for timber, to allow drainage and expansion. Grooved composite boards often use hidden clips with their own spacing.
You'll need approximately
0
Everything you need to lay it
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How much turf do I need? Measure the lawn area (length × width) and add about 5% for shaping around edges and curves. Standard UK turf rolls cover about 1 m² each, so a 25 m² lawn needs roughly 27 rolls. Lay it as soon as it arrives and water well.
Turf FAQs
How soon should I lay turf?
Within 24 hours of delivery — turf is a living product and deteriorates quickly if left rolled up, especially in warm weather.
You'll need approximately
0
Everything you need
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How much gravel do I need? Multiply the area by the depth to get the volume, then multiply by the density of the stone (around 1.5 tonnes per cubic metre for gravel). A 10 m² path at 5 cm deep needs about 0.5 m³, roughly 0.75 tonnes. A 4–5 cm depth is typical for paths and borders.
Gravel FAQs
How deep should gravel be?
About 4–5 cm for a decorative path or border, and 5 cm or more over a sub-base for a driveable surface. Deeper looks generous but is harder to walk on.
You'll need approximately
0
Everything you need
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How much concrete do I need? Multiply length × width × depth to get the volume in cubic metres. A 3 m × 2 m slab at 10 cm deep is 0.6 m³. For anything above about 0.3 m³, ready-mixed delivery is usually cheaper and easier than mixing bags by hand.
Concrete FAQs
Bags or ready-mix?
For small jobs (a few fence posts, a small base) bagged concrete is fine. Above roughly 0.3 m³ it's worth pricing ready-mix delivery — mixing dozens of bags by hand is slow, hard work.