Roll-On Turf Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/9/2026
The number of turf rolls is calculated by dividing the surface to cover (with a waste margin) by the surface area of one roll. For 50 m² with the most common format (0.8 m²) and a 10% margin, 69 rolls are needed.
Explanation
Roll-on turf (or pre-grown sod) comes in pre-cut rolls, giving an immediately usable lawn, unlike seeding, which takes several weeks to germinate and take root. Two roll formats coexist among French suppliers: a reduced format of 0.4 × 2 m (0.8 m²), the most common, and an extended standard format of 0.4 × 2.5 m (1 m²) — always check the exact format stated by your supplier before ordering, since both are found on the market. As with tiling, a waste margin is needed to account for cuts around edges, flower beds, or paths, especially for an irregularly shaped garden. Roll-on turf must be laid quickly after delivery — generally within 24 to 48 hours — or its ability to take root drops sharply, which makes it important to plan the needed quantity carefully before delivery rather than ordering as you go. Once the lawn is laid, our garden fertilizer dosage calculator helps maintain it over time.
Example for a 50 m² garden
Inputs
Surface: 50 m². Roll format: 0.8 m². Margin: 10%.
Calculation
Surface with margin = 50 × 1.10 = 55 m². Rolls = 55 ÷ 0.8 = 68.75, rounded up to 69.
Result
You need to order 69 rolls of turf in the reduced format (0.8 m²) for this garden.
Frequently asked questions
Why always round up to the next roll?
An opened roll generally can't be cut exactly to the remaining missing surface without waste: rounding up to the next whole number guarantees enough turf to cover the entire surface, including edge cuts.
How long can roll-on turf wait before being laid?
Ideally 24 to 48 hours after delivery. Beyond that, especially in hot weather, rolled turf starts to yellow and its ability to take root after laying drops noticeably. Prepare the soil before delivery rather than after.
Does a garden with a complex shape need a bigger margin?
Yes: a garden with many curves, flower beds, or obstacles generates more waste than a simple rectangle. A margin of 15 to 20% is then safer than the usual 10%.