CNC Thread & Fit Calculator

CNC Tolerance is a simple, fast, and highly accurate tolerance calculator designed specifically for CNC machinists, programmers, turners, millers, and quality inspectors. Forget flipping through heavy technical tables and doing manual calculations next to the machine!

Since time is money in the workshop, our app is clean and straightforward: just enter the nominal size and the desired tolerance (e.g., 5G6, 20p6, 42h9), and the system instantly calculates the result with micrometer precision.

KEY FEATURES:

• Instant calculation: Quickly get upper and lower limit deviations.

• Tolerance center calculation: Clearly highlights the center of the tolerance, which is a massive help and time-saver for CNC programming (tool wear offsets).

• Standard ISO values based on the metric (mm) system.

• Clean, Dark Mode design: Doesn't blind you in the workshop and is easy to read.

FREE VERSION INCLUDES:

The most commonly used basic tolerance zones (e, f, g, h, E, F, G, H) are completely free and unlimited to calculate in the app.

PRO VERSION (via One-Time In-App Purchase):

Support the development with a single payment and enjoy an unrestricted workflow!

• Full ISO Database: Unlock all existing tolerance zones (e.g., p6, k6, js7, etc.).

• 100% Ad-Free: A completely distraction-free working environment.

• Lifetime License: No monthly fees or subscriptions. Buy it once, and it’s yours forever (can be restored anytime with a single tap if you change devices or reinstall).

Make your daily work at the CNC controller easier!