Soil & Turf Underlay Volume Calculator

Work out how much screened soil or turf underlay you’ll need—and the trailer loads or delivered m³ cost—before you start your Aussie lawn project.

Lawn area (m²) Desired depth / thickness Top‑up – 50 mm Standard – 100 mm Premium – 150 mm Custom Material & price Screened topsoil – $60 /m³ Turf underlay premium mix – $75 /m³ River sand – $55 /m³ Custom Trailer size (optional) Skip trailer count 6×4 trailer – 0.7 m³ 8×5 trailer – 1.1 m³ Calculate Underlay Formula: volume (m³) = area × depth(mm)/1000. Trailers = volume ÷ trailer vol.