Specific Charge Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the charge per hole.
- Enter the burden, spacing and bench height.
- Press Calculate.
How it works
Specific charge (powder factor) = charge per hole ÷ the rock volume that hole breaks (burden × spacing × bench height).
Worked example
90 kg, 3×3.5×10 m. ≈ 0.086 kg/m³.
Frequently asked questions
Is specific charge the same as powder factor?
Yes — both express explosive per unit volume of rock. This tool derives it per hole.
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.