Chain Length Calculator
Estimate bike chain length in links from chainstay, chainring, and cog.
Quick answer: enter your details below and click Calculate Chain Length — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Enter chainstay length in millimetres.
- Enter the largest chainring and cog teeth.
- Click Calculate Chain Length.
About this tool
Enter chainstay length in millimetres plus chainring and cog teeth. The tool applies the standard chain-length formula and rounds up to an even number of links. It is an estimate: always check the fitted chain on the bike before cutting.
Frequently asked questions
Why round to an even number?
Chains join in pairs of links, so the fitted length must be even.
Should I cut exactly to this?
Use it as a starting length and check derailleur tension on the bike before cutting.