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Calculators · Free
Roller-chain length planner
Estimate chain pitches, choose a link count and recalculate the resulting centre distance.
01Enter your values
Runs in your browser02Roller-chain length planner
Runs in your browser
How it works
Estimate chain pitches, choose a link count and recalculate the resulting centre distance.
Lp = 2C/p + (z₁+z₂)/2 + (z₂−z₁)²/(4π²C/p)
Runs in your browser
Discovery source
Your data stays yours
Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑Estimate chain pitches, choose a link count and recalculate the resulting centre distance.
Uses sprocket tooth counts, pitch and nominal centre distance. Even-link mode avoids an offset link; verify allowance, tensioning and manufacturer limits.
How to use it
- Enter your values
Unit for every dimension · z₁ · z₂ · p · C · N mod 2
- Calculate / generate
Estimate chain pitches, choose a link count and recalculate the resulting centre distance.
- Result
116 Links
Calculation method
Lp = 2C/p + (z₁+z₂)/2 + (z₂−z₁)²/(4π²C/p)
Roller-chain length planner
- Unit for every dimension
- mm
- z₁
- 18
- z₂
- 54
- p
- 12.7
- C
- 500
- N mod 2
- Even links
Result
116 Links
Frequently asked questions
Why can the centre distance change?
A chain has a whole number of pitches, so rounding the link count changes the compatible centre distance.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.