Blast Hole Count Checker
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 block length and width.
- Enter the burden and spacing.
- Press Calculate for the approximate hole count.
How it works
Approximate holes = block area ÷ (burden × spacing). The actual layout depends on edge offsets and the pattern type.
Worked example
40×25 m, 3×3.5 m pattern. ≈ 96 holes.
Frequently asked questions
Why is it approximate?
Real patterns have edge offsets, staggered rows and trim holes, so the surveyed setout count varies a little.
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.