Estimate how much artificial grass your garden needs, with a wastage allowance for roll widths and joins, plus an indicative turf and installation cost.
Enter your room measurements below.
Artificial grass comes on rolls, usually 2m or 4m wide, and the pile must all run in the same direction so joins are invisible. Because of this, gardens often need more grass than their bare area suggests, especially awkward or curved plots. This calculator adds a 10% wastage allowance for a simple rectangular lawn; complex shapes can need more.
Remember that with artificial grass the groundwork — excavation, sub-base, membrane and joining — usually costs more than the turf itself, so the installation figure here reflects a full fitted job rather than turf alone.
Allow about 10% for a simple rectangular lawn. Curved borders and awkward shapes need more because the pile must run one way, limiting how offcuts can be used.
Most of the cost is groundwork — excavation, a compacted sub-base, weed membrane and joining. This is what makes the lawn drain well and stay flat, so it is worth doing properly.
It should not go straight onto soil. A prepared, free-draining sub-base is needed to stop sinking and pooling, which is the main reason installation costs more than the turf.