Calculate a wheel and build it
The free, open bicycle-wheel spoke calculator.
Calculate spoke lengths for each side, convert readings for supported tensiometers and spoke profiles, and practise truing in the simulator. Check the formula and the recorded hub and rim sources. No login, no paywall.
Why this calculator?
- ✓ Tables for Park Tool, DT Swiss, Unior and other included devices and profiles.
- ✓ Length calculations include asymmetric rims and manufacturer-specified straight-pull offsets.
- ✓ The formula and intermediate values are available to check.
- ✓ Hub and rim records include source information and notes where available.
- ✓ Free, no login, and it runs in your browser.
From the blog
All articles →- Sep 20, 2026 Spoke Calculator updates: tension balance and custom tables Explicit rim offset, wheel identity, balance versus target tension and custom conversion tables. The changes explained with examples and screenshots.
- Jul 3, 2026 Build a bicycle wheel from start to finish A wheelbuilding workflow covering measurements, spoke lengths, lacing and tension adjustments, with the checks to complete before riding.