Volume to fill288 L0.288 m³
Bags to buy650 L bags
Buy a little extra7soil settles ~10–20%
Fresh soil and compost settle. Expect it to drop 10–20% in the first weeks, so rounding up (or the "buy a little extra" figure) is sensible — you can always top up. For a mix, a common recipe is roughly 60% topsoil, 30% compost and 10% grit. Nothing you type leaves the page.