Stepper Motor Steps per mm CalculatorSTEPS PER MM

1. 1Enter the motor step angle from its datasheet (1.8° is typical).
2. 2Select the microstepping configured on the driver.
3. 3Choose the drive: lead for a leadscrew, or belt pitch and pulley teeth for a belt.
4. 4Put the steps/mm into your firmware, e.g. Marlin M92, or use the travel per revolution as Klipper rotation_distance.
5. 5Command a 100 mm move, measure it and fine-tune with new = old × commanded / measured if needed.

Steps/mm is how many pulses the controller must send for the axis to move 1 mm. A stepper has N = 360° / step angle full steps per revolution — 200 for a 1.8° motor. Microstepping µ subdivides each step, so at 1/16 one revolution takes 3200 pulses. Divide by the travel per revolution (the leadscrew lead, or belt pitch × pulley teeth) and you have steps/mm, the value used by Marlin (M92 / DEFAULT_AXIS_STEPS_PER_UNIT) and GRBL ($100–$102).

With a 1.8° motor at 1/16 microstepping: GT2 × 20 T belt = 80 steps/mm, GT2 × 16 T = 100 steps/mm, a T8 leadscrew (8 mm lead) = 400 steps/mm, Tr8×2 = 1600 steps/mm. A 0.9° motor doubles each value. Need a GT2 pulley with a different tooth count? Generate it with the pulley generator on this site and send it to Orinovate for printing.

N = 360° / θ
steps/mm = (N × µ) / L
L = lead (leadscrew) ; L = pitch × z (belt)
Δx = 1000 / (steps/mm)  [µm]
s = pulses / (steps/mm)

Results are for design reference only; confirm against supplier catalogues and the applicable standards before manufacturing.