Designed vs Drilled Metres Calculator
Compares designed against drilled metres to report over-drill and redrill variance.
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 designed metres and the drilled metres.
- Press Calculate.
- Read the difference and variance.
How it works
Compares drilled metres against the design and shows the variance as a percentage. A large positive variance can flag over-drill or redrills.
Worked example
Design 1,500 m, drilled 1,560 m. +60 m (+4%).
Frequently asked questions
Why track this?
Variance highlights over-drilling, redrills and design changes that drive cost and schedule.
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Cite this tool
Zerdly. (2026). Designed vs Drilled Metres Calculator. Retrieved from https://www.zerdly.com/tools/designed-metres-vs-drilled-metres-calculator/
Tip: Enter any known values to calculate the remaining results.
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