Asphalt Calculator
How many bags do you need?
In short
To work out how much Asphalt in a Bag you need, multiply length × width × depth to get the volume. Each 20kg bag fills about 0.0087 m³ once compacted (≈ 0.17 m² at 50mm) and each 15kg bucket about 0.0065 m³. A 1 tonne bulk bag covers roughly 8.7 m² at 50mm.
Type in the length, width and depth in millimetres of the area to be repaired. We’ll estimate the number of 20kg bags or 15kg buckets required.
Based on 1 × 20kg bag filling about 0.0087 m³ once compacted (≈ 0.17 m² at 50mm). Allow extra for compaction and a level finish. For specialist help, contact us.
020kg bags
015kg buckets
0m² area
Questions & answers
Asphalt Calculator FAQs
How many bags do I need for 1 m² at 50mm deep?
About 6 × 20kg bags (0.05 m³ ÷ 0.0087 m³ per bag ≈ 5.75, rounded up).
How much does a 1 tonne bulk bag cover?
Approximately 8.7 m² at 50mm depth (about 17 m² at the 25mm minimum).
Should I buy extra?
Yes — over-fill slightly to allow for compaction and a level, crowned finish.
What depth should I enter?
The finished compacted depth: minimum 25mm, ideally 50mm.
Fix it once.
Fix it permanently.
Talk to our team about Asphalt in a Bag, Rubberised Crack Filler and bulk supply.