The free Stepper Steps per mm, Belt Length & Pulley
Calculate stepper steps per mm for belt and lead-screw drives, GT2 belt length and centre distance for two pulleys, belt speed.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
The Stepper Steps per mm, Belt Length & Pulley with sample data entered and the result showing.
What is the Stepper Steps per mm, Belt Length & Pulley?
Setting up a 3D printer, CNC or robot axis starts with one number: how many motor steps move the axis one millimetre. This calculator gives you steps per mm for belt-and-pulley drives (GT2, MXL, HTD, T2.5), lead screws (T8 with any lead) and rack-and-pinion drives from the motor's steps per revolution, the microstepping, the pulley teeth and the belt pitch or screw lead, with optional gearbox reduction. It also shows the resolution of one microstep and the rotation_distance value that Klipper wants.
A second tab computes the belt length for two pulleys at a given centre distance using the exact open-belt formula, rounds to a real tooth count and tells you the centre distance that belt will actually give; you can also enter a belt size and find the centre distance. The third tab estimates belt speed, pulley diameter, theoretical pull force and step pulse rate from motor speed and torque, with realistic warnings about speed-torque derating.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Belts, lead screws and racks, with microstepping and gearbox ratio.
Shows steps_per_mm and rotation_distance.
Exact open-belt formula, nearest standard tooth count and next size up.
Belt speed, pull force and step rate with derating notes.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This maker tool | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
What is a multi-start lead screw?
Lead = pitch × starts, e.g. T8×2 with 4 starts has an 8 mm lead.
How accurate is the belt length?
Exact for open belts; add tooth-count rounding and adjustment.
What is rotation_distance?
Distance moved per full motor revolution (Klipper).
Is it free?
Yes.
How do I use the Stepper Steps per mm, Belt Length & Pulley?
1. Choose belt, screw or rack and enter the motor and microstepping. 2. Read steps per mm and rotation_distance. 3. Use the belt tab to size a belt for your pulley layout. 4. Use the speed tab to sanity-check performance.
More free tools
Related to the Stepper Steps per mm, Belt Length & Pulley.
Try the Stepper Steps per mm, Belt Length & Pulley now
Steps per mm for belts and lead screws, belt length and centre distance, speed and torque. Free to use.
Try it free