Timing Belt Drive Calculator
Enter belt type, pulley teeth, and center distance to compute pitch length and pulley parameters.
mm
teeth
teeth
mm
Pulley Parameters
Driver Pitch Dia. d₁ = P·z₁/π
- mm
Driven Pitch Dia. d₂ = P·z₂/π
- mm
Speed Ratio i = z₂/z₁
-
Belt Length & Teeth
Calculated Pitch Length L
- mm
Calculated Tooth Count = L/P
-
Selected Tooth Count (integer)
-
Actual Pitch Length
- mm
Standard Belt Type Reference
| Type | Pitch (mm) | Tooth Height | Belt Thickness | Tooth Angle |
|---|---|---|---|---|
| MXL | 2.032 | 0.51 | 1.14 | 40° |
| XL | 5.08 | 1.27 | 2.30 | 50° |
| L | 9.525 | 1.91 | 3.60 | 40° |
| H | 12.7 | 2.29 | 4.30 | 40° |
| XH | 22.225 | 6.35 | 11.20 | 40° |
| XXH | 31.75 | 9.53 | 15.70 | 40° |
| 3M | 3.000 | 1.17 | 2.40 | — |
| 5M | 5.000 | 2.06 | 3.60 | — |
| 8M | 8.000 | 3.38 | 5.60 | — |
Notes
Pitch Length Formula
L = 2C + π(d₁+d₂)/2 + (d₂−d₁)²/(4C)
- C — Center distance
- d₁, d₂ — Pitch diameter = Pz/π
Selection Tips
- Min driver teeth generally ≥ 14
- Speed ratio typically ≤ 10
- Center distance: 0.7(d₁+d₂) ≤ C ≤ 2(d₁+d₂)
- HTD profiles (3M/5M/8M) offer higher load capacity