Calculate Stepper Motor Steps/mm for 3D Printers & CNC

A free browser-based stepper motor calculator that computes full steps/rev, microsteps/rev, steps/mm (or steps/°), and required step pulse frequency. Supports belt drives (GT2/GT3), leadscrews, and rotary axes. Perfect for configuring Marlin, Klipper, GRBL, or any motion-control firmware.

How to Use the Stepper Motor Calculator

Select step angle and microstepping

Choose 1.8° or 0.9° (or enter a custom angle for unusual motors). Pick your driver's microstepping setting.

Choose drive type

Select Belt for timing-belt axes, Leadscrew for Z-axis screws, or Rotary for turntables and extruders without a travel axis.

Enter drive parameters

For belt drives: choose belt pitch (GT2 = 2 mm) and pulley tooth count. For leadscrews: enter the lead in mm/rev.

Read out steps/mm

Copy the steps/mm value directly into your firmware (Marlin M92, Klipper rotation_distance, GRBL $100–$102).

Compute steps/mm, microsteps, and pulse frequency for any CNC or 3D printer axis

Quick Presets

Motor Parameters

Step angle

Microstepping

Drive Type

Belt pitch

Pulley tooth count

Lead (mm/rev)

Distance the nut travels per full motor revolution.

Outputs steps/° and °/step directly from step angle and microstepping — no additional inputs needed.

Speed (optional)

Target speed (mm/s)

Target motor RPM

Enter either value — the other is calculated automatically.

Formulas

Full steps/rev

360 / θ

Microsteps/rev

N × M

Steps/mm (Belt)

N·M / (p·T)

Steps/mm (Screw)

N·M / lead

Step pulse freq.

steps/mm × v

Motor RPM

Hz × 60 / (N·M)

θ = step angle (°), N = full steps/rev, M = microstep divisor, p = belt pitch (mm), T = pulley teeth, v = speed (mm/s).

Features

Belt, leadscrew, and rotary drive modes with automatic steps/mm calculation All common microstepping ratios from full-step to 256× microstep Speed section: enter mm/s or RPM — the other value is derived automatically 7 quick presets for typical 3D printer X/Y, Z, and high-resolution axes Sanity-check: 1.8° + 16× + GT2 20T → 3200 microsteps/rev, 80 steps/mm

FAQ

What is steps/mm?

Steps/mm tells the firmware how many step pulses are needed to move the axis exactly 1 mm. It depends on step angle, microstepping ratio, and mechanical drive ratio (belt pitch × teeth, or leadscrew lead).

What microstepping should I use?

16× is the most common choice for 3D printers — it balances resolution with noise and torque. Higher values (32×, 64×) improve smoothness but reduce torque and require faster step rates.

What is a leadscrew lead?

The lead is the linear distance (in mm) the nut travels per one full revolution of the screw. A T8 leadscrew with 4 starts × 2 mm pitch has a lead of 8 mm.

Why does 1.8° + 16× + GT2 20T give 80 steps/mm?

200 full steps/rev × 16 microsteps = 3200 microsteps/rev. Belt travel per rev = 2 mm × 20 teeth = 40 mm. Steps/mm = 3200 / 40 = 80.

How do I convert steps/mm to rotation_distance (Klipper)?

rotation_distance = full_steps_per_rotation × microsteps / steps_per_mm. For the GT2 20T example: 200 × 16 / 80 = 40 mm — which equals belt pitch × teeth.

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Published 18 May 2026 Updated 21 May 2026