3D Printing Calculators
Stepper Motor E-Steps Calibration Calculator
https://www.3dsizing.com/calculators/estep-calibration/
Estimate only — not firmware, a slicer profile or a shop quote. Confirm on a test print.
Stepper Motor E-Steps Calibration Calculator
Mark 120 mm of filament, command 100 mm, measure what actually moved, then correct firmware e-steps. The same ratio works for any requested length, not only 100 mm.
Inputs
Results
- New e-steps
- 97.895steps/mm
- Length error
- -5.00%
Save with M92 E… then M500 on Marlin-style firmware.
Negative = less filament than commanded (under-extrusion).
Calculation method
New e-steps = old e-steps × requested distance / actual extruded distance. If you always request 100 mm this is the familiar new = old × 100 / actual. Error percent is (actual − requested) / requested × 100 so a 95 mm result on a 100 mm command is −5%. Lengths are millimetres; the unit toggle shows inches for US calipers without changing the ratio.
Exact formula
new_esteps = old_esteps × requested_mm / actual_mm. Error % = (actual − requested) / requested × 100. Negative error means under-extrusion (actual shorter than commanded). Limits: Measure at print temperature. Bowden stretch and a cold mark on the filament will lie.
100 mm is a convenience
Any pair of requested and actual lengths is valid. 50 mm is faster but noisier; 120 mm commanded with a 140 mm mark leaves room to measure.
After a new extruder
Bondtech-style dual drive and cheap BMG clones often land near 140–415 e-steps depending on gearing. Do not copy a forum number — measure.
Frequently asked questions
Do I heat the hotend?
Follow your firmware guide. Many people extrude into air at print temperature so the melt does not back-pressure the measurement.
Direct drive vs Bowden?
Same formula. Bowden spring in the tube can add a millimetre of error — mark on the filament before the tube, not on the tube.
Should I repeat the test?
Yes. After saving new e-steps, run 100 mm again. You should land inside about ±0.5 mm before you chase flow % in the slicer.
Is this the same as flow rate in the slicer?
No. E-steps are the hardware millimetres. Slicer flow is a remaining fudge for die swell and part geometry.
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