Concrete Calculator
Estimate volume and bag count for a rectangular slab.
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Gravel Calculator
Estimate gravel volume, weight, and bag quantities.
02EXAMPLE RESULT
Gravel volume
1.1
m³
Estimated weight1.76metric tonnes
Weight in kilograms1,760kg
Estimated bags71bags
Volume in cubic yards1.438746yd³
Results update as you type. Calculate adds a snapshot to your history.
How this calculation works
The selected allowance is added to volume before estimating mass. Density is a user-provided bulk estimate; compaction and product type can change the required quantity.
Volume = length × width × (depth ÷ 100); mass = volume × bulk density
Your calculation, step by step
- Base volume = 5 × 4 × (5 ÷ 100) = 1 m³.
- Including 10% allowance = 1.1 m³.
- Estimated mass = 1.1 × 1,600 = 1,760 kg.
A worked example
5m × 4m × 5cm with 10% extra is 1.1m³, or 1.76 metric tonnes at 1,600kg/m³.