The formula
Turf rolls = length × width × (1 + waste%) ÷ coverage per roll. Topsoil volume = area × depth (mm) ÷ 1,000. Bags = volume × density × 1,000 ÷ bulk bag weight.
Garden • UK CALCULATOR
Turf & Topsoil Calculator UK
Plan a new rectangular lawn: calculate square metres of turf and optional topsoil at your chosen depth. Enter the coverage of the turf roll and weight of a bulk bag.
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Your estimate starts here
Enter your measurements and calculate to see materials, quantities and an optional price estimate.
GOOD TO KNOW
How this calculator works
Worked example
A 6 × 4 m lawn is 24 m². With 5% turf allowance, that is 25.2 m², or 26 rolls at 1 m² per roll.
Check before ordering
Turf rolls vary in size, and some suppliers sell by the square metre. Topsoil density changes with moisture and composition. Consider settling, existing soil level, drainage and lawn preparation before ordering.