Lawn area (add up to 3 areas if your lawn isn't one simple rectangle)
Turf rolls
| Area | Amount |
|---|
Topsoil top-up (leave depth at 0 to skip)
| Topsoil needed | 0.00 t |
| Bulk bags | 0 |
| 25kg bags | 0 |
How this calculator works
Each lawn area is a simple length × width rectangle; enter up to three if your lawn is an L-shape or has a separate patch, and the total area is the sum of all three. Turf rolls are sold in a range of sizes depending on the supplier, so the roll size field is editable rather than fixed; UK rolls commonly run from about 0.6 to 1 m2 each, check the size quoted by your turf supplier and enter it here for an accurate roll count. Wastage covers trimming to fit awkward edges and curves, and the odd damaged roll.
Do you need a topsoil top-up?
New turf roots into whatever is underneath it, so if the existing ground is compacted, uneven, or low in organic matter, a layer of fresh topsoil first gives the turf a much better start. A 25 to 50mm top-up is typical where the ground just needs levelling and enriching; deeper layers are for building up a new bed from scratch. Leave the depth at 0 if your existing soil is already in good condition and just needs raking level.
What this calculator does not check
This tool covers turf and topsoil quantities only. It doesn't check drainage (a lawn that regularly waterlogs needs the underlying issue fixed before turfing, not just more soil), existing weed or root removal, or how soon after laying the turf can be walked on or first mowed, which varies by season and turf type. Check with your turf supplier for aftercare specific to the variety you buy.
Related tools
Buying topsoil, gravel or hardcore in bulk for a bigger job than a lawn top-up? The aggregate calculator handles larger volumes and other materials.