Turf is the simplest of the garden counts: area divided by the area of one roll, plus a little for trimming.
Area divided by the roll
Many UK suppliers sell rolls that cover 1 m² each; Sherborne Turf is one. With 1 m² rolls, the number of rolls is the area in square metres.
An 8 m by 5 m lawn is 40 m². With 5% added for trimming, it is 42 m²: 42 rolls.
Check the roll size
Not every supplier cuts 1 m². Some rolls are smaller, and big rolls laid by machine are much larger. Enter the area of one roll from the supplier, not the length of the roll.
How much to add
Five per cent suits a rectangle. Curved edges, island beds and paths through the lawn take more, because each curve is trimmed from a straight roll.
Measure an irregular lawn as rectangles and add them together. A curve can be measured as the rectangle it fits inside; the extra becomes the trimming allowance.
| Lawn | Area | Rolls |
|---|---|---|
| 5 × 4 m | 20 m² | 21 |
| 8 × 5 m | 40 m² | 42 |
| 10 × 6 m | 60 m² | 63 |
Seed or artificial instead
Seed is cheaper and slower; the Grass seed calculator gives grams per square metre. For an artificial lawn, the roll width matters more than the area, and the Artificial grass calculator works out the strips and seams.
Figures are estimates for a shopping list. Check the pack or datasheet before you buy.