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Artificial Grass Calculator
Artificial grass comes off a roll at a fixed width, and every piece has to run the same way — so you nearly always buy more than the bare square metreage. Pop in your area, pick a roll width, and get an honest linear-metre figure plus jointing tape, pins and optional sand.
Sand infill: 0 kg (at the rate you set)
Every figure here is an estimate, rounded up. Pile direction increases waste — lay all pieces running the same way. Jointing tape assumes joins run the length of the area, and pins assume roughly 250 mm (25 cm) spacing around the perimeter and along any joins. Always confirm against your supplier's roll sizes and fitting guidance.
How much artificial grass do I need?
Start with your area in square metres (length × width). Because grass is sold off a fixed-width roll — usually 2 m or 4 m — and every piece must run the same way, you buy it in linear metres of that roll, not exact square metres. Divide your area (plus a wastage allowance) by the roll width and round up to the next whole metre. This calculator does that for you and also shows the square metres you actually get off the roll, which is normally a little more than you strictly need.
Why does artificial grass have more wastage than you'd expect?
Artificial grass has a pile that leans in one direction, a bit like the nap on velvet. If you lay two pieces facing different ways they'll catch the light differently and the join will show as an obvious line. So every piece has to be cut and laid running the same way, which means you can't simply rotate an offcut to fill a gap. That's why a 10% allowance is sensible for a straightforward rectangle, rising to 15–20% for angled, curved or oddly-shaped areas where more trimming is unavoidable.
What do I need to lay artificial grass?
Beyond the grass itself, a typical installation needs a compacted sub-base (usually MOT type 1 hardcore topped with sharp sand or a laying grit), a weed-membrane, jointing tape and adhesive where two pieces meet, and galvanised U-pins or pegs to secure the edges and joins. Some grasses are then brushed with a kiln-dried sand infill to weigh them down and keep the pile upright. This tool estimates the grass, tape, pins and optional sand — the base materials depend on your ground and drainage, so price those separately.
Does this tool store my details?
No. There's no sign-up and nothing to submit — every calculation runs entirely in your browser as you type. Nothing you enter is uploaded, saved or sent anywhere, so you can use it as many times as you like without leaving a trace.
Please note: this tool gives a guide or estimate only. It may not be 100% accurate and is not professional advice — always check the figures before you rely on them. Nothing you enter is uploaded — the calculation runs entirely in your browser.
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