Blast Hole Count Checker
Estimates the number of blast holes for a block from its area, burden and spacing.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
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.
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Cite this tool
Zerdly. (2026). Blast Hole Count Checker. Retrieved from https://www.zerdly.com/tools/blast-hole-count-checker/
Tip: Enter any known values to calculate the remaining results.
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