20mm Gravel25L Mini Sack
Handy 20mm gravel sack for pot toppers, small paths and repairs.
£5.25
£21.00 / 100L
Gravel and Aggregate Calculator
Enter your measurements and get exact quantities, costs and a ready-to-order material list — for gravel, aggregate and every other garden material.
01 — The Calculator
How much gravel does your garden need?
Pick a material, pace out your plot, and the value engine prices every way to fill it — hippo bags, dumpy bags or handy sacks.
Enter dimensions to calculate.
Volume
0 litres
Cubic
0.00 m³
Area
0.0 m²
Est. weight
0.00 tonnes
Best price
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Enter your plot size below — we'll price the cheapest way to cover it.
5 cm
0102030 cm
Depth changes the volume a lot — 5cm mulch is normal, raised veg beds want 20cm+.
Not sure? See the depth guide belowWhy allow extra? See why soil settles after laying
The Catalogue
Your Materials Catalogue
Browse and customise your personal price list below. The default prices shown are indicative — useful as a starting point for budgeting, but your actual merchant prices will vary.
Why set your own prices?
When you update a product with your negotiated merchant price, every estimate and project board you create will automatically use your rate. Your quotes reflect what you actually pay, not a generic average — giving you more accurate margins and faster, more professional estimates.
How it works
- 1Click “Customise your own prices” and find the product below
- 2Enter your merchant price
- 3Save — stored on this device, and synced to your trade account when logged in
- 4Every project board and trade estimate now applies your saved price automatically
Your custom prices can be updated at any time as your supplier rates change. Logged-in trade users: your prices follow you across every device.
Custom prices flow into the calculator, project board and trade estimates automatically.
Aggregates4 products
20mm Gravel20mm Gravel1,000L Hippo Bag
Hard-wearing 20mm grey gravel for driveways, paths and drainage, in a super-bulk hippo bag.
£120.00
£12.00 / 100L
20mm Gravel850L Bulk Bag
20mm gravel aggregate in a standard dumpy tote bag.
£105.00
£12.35 / 100L
20mm Gravel0.9m² Grid Panel
Honeycomb ground-stabilisation grid that stops gravel migrating on driveways and paths — one panel covers 0.9m², trims to fit with a saw.
£6.95
£6.95 each
Default prices are indicative only — confirm with your merchant before ordering.
Common questions
As a rule of thumb, 1m³ of gravel covers about 20m² at 50mm deep — so each square metre needs roughly 50 litres (about 80kg) at driveway depth. Enter your area above and the calculator works it out exactly, including a sensible allowance for wastage.