Blast Volume Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the burden, spacing, bench height and number of holes.
- Optionally enter the rock density for tonnes.
- Press Calculate.
How it works
Blast volume = burden × spacing × bench height × number of holes (in bank cubic metres). Multiply by density for in-situ tonnes.
Worked example
50 holes, 3×3.5×10 m. ≈ 5,250 BCM.
Frequently asked questions
What is BCM?
Bank cubic metres — the volume of rock in place, before it breaks and bulks up (see the swell-factor tool).
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.