Designed vs Drilled Metres 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 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.
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.