About this tool
Find the depth to cut a countersink to a given diameter and angle.
Depth = (D − d) ÷ 2 ÷ tan(angle ÷ 2), where D is the countersink diameter, d the hole diameter and angle the included tool angle.
Formula: h = (D − d)/(2·tan(α/2))
Example: Countersink diameter (D) = 10, Hole diameter (d) = 5, Countersink angle = 90° → Countersink depth = 2.5.
Common angles: 82° (imperial screws), 90° (metric), 100° and 120°.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Countersink Depth Calculator work?
Depth = (D − d) ÷ 2 ÷ tan(angle ÷ 2), where D is the countersink diameter, d the hole diameter and angle the included tool angle.
What should I keep in mind?
Common angles: 82° (imperial screws), 90° (metric), 100° and 120°.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.