Hole Angle Deviation 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 designed and measured collar angles.
- Enter the hole depth.
- Press Calculate.
How it works
Toe error ≈ hole depth × sin(angle deviation). Small collar-angle errors grow into large toe errors on deep holes.
Worked example
3° off over a 12 m hole. Toe error ≈ 0.63 m.
Frequently asked questions
Why does toe position matter?
Toe errors cause uneven burden at the bench floor — leading to toe (hard digging) or overbreak.
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.