Gravel Calculator – How Much Gravel Do I Need?
Use our simple guide below to estimate the amount of decorative stone required for your project.If you’d rather not work it out yourself, just send us your measurements and we’ll calculate everything for you.
How to calculate gravel
To calculate how much gravel you need, you’ll need:
Length (metres or feet)
Width (metres or feet)
Depth (recommended below)
Recommended depths:
Driveways: 40–50mm
Paths & patios: 30–40mm
Borders & decorative areas: 20–30mm
Use this formula:
Length × Width × Depth = Volume
(in cubic metres)
Then:
1 bulk bag covers approx 8–10m² at 40–50mm depth
Quick estimate guide
Bulk Bag Coverage Guide:
- 1 bulk bag = approx 8–10m²
- 2 bulk bags = approx 16–20m²
- 3 bulk bags = approx 24–30m²
This is based on typical driveway depth.
Common examples
Example 1
Driveway: Driveway: 5m x 4m = 20m²
You’ll need approx 2–3 bulk bags
Example 2
Garden area: 3m x 3m = 9m²
You’ll need approx 1 bulk bag
Example 3
Border: 2m x 1m = 2m²
You can use 20kg bags instead of a bulk bag
FAQs
Find answers to the most common questions about our delivery service and what to expect.
Most driveways require 40–50mm depth, which means 1 bulk bag typically covers 8–10m².
20mm gravel such as Black Ice or Granite is ideal as it provides a stable surface.
Yes, we offer local delivery across Kent with fast turnaround times. See more information on delivery area.
Yes — just send us your measurements and we’ll work it out for you.
Need more help?
Reach out to our team for any other delivery questions.
We supply and deliver gravel across Kent, including:
Deal
Folkestone
Sittingbourne
Map image from © OpenStreetMap contributors
Need Help? We’ll Do It For You
Send us: Length, Width and Area type (driveway, garden, path)
…and we’ll reply with:
- Exact quantity needed
- Best product recommendation
- Full price