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Belt Length Calculator
Length of a two-pulley belt from the pulley diameters and the centre distance.
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Belt length
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Length of a two-pulley belt from the pulley diameters and the centre distance.
Belt Length Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: L = 2C + pi(D + d)/2 + (D – d)^2/(4C).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Belt Quick Guide
Typical values for reference.
| D mm | d mm | Centre mm | Length mm |
|---|---|---|---|
| 100 | 50 | 300 | 837.7 mm |
| 200 | 80 | 500 | 1,447.0 mm |
| 300 | 100 | 800 | 2,240.8 mm |
| 400 | 150 | 1000 | 2,879.6 mm |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Belt Length Calculator FAQ
Answers to common questions about this calculator.
Use L = 2C + pi(D+d)/2 + (D-d)^2/4C.
Pick the nearest standard length and allow tensioner travel.
L = 2C + pi(D + d)/2 + (D – d)^2/(4C).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.