Extruder E-Steps Calibration Calculator
Get the exact new extruder steps/mm (E-steps) after a calibration extrude, plus the percentage error, so your slicer's requested filament length matches what the extruder actually pushes.
Enter Values
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How to use this calculator
- Enter your printer's current E-steps value (steps/mm) — read it from the firmware, an M503 report, or the display.
- Enter the length you asked the printer to extrude (typically 100 mm) and the actual length consumed, which is the requested length minus any leftover you measure before the extruder entry.
- Read the New E-steps, save it to firmware (M92 then M500 on Marlin), and re-run the test to confirm.
How it works
The correction is proportional: if the extruder pushed less than you asked, its steps/mm are too low, so New E-steps = current E-steps × (requested / actual). The extrusion error is (requested − actual) / requested × 100, a positive number when under-extruding and negative when over-extruding.
Worked example
Worked example. With current E-steps of 93, a requested 100 mm and an actual 96 mm consumed, the printer under-extruded by 4%. New E-steps = 93 × 100 / 96 = 96.875 steps/mm, and the extrusion error is 4%.
Common mistakes
- Measuring the wrong direction: actual length is requested MINUS the leftover mark distance, not the leftover itself.
- Extruding too fast or with a cold nozzle, which causes slipping and skews the reading — use a slow speed and full print temperature.
- Applying the new value but never re-running the test, so a second-order error goes unnoticed.
Frequently asked questions
How long should the test extrusion be?
100 mm is standard; 120 mm gives a little more margin so the mark stays clear of the extruder body. Longer test lengths make the percentage error easier to measure accurately.
Do I need to re-run the calibration after applying the new value?
Yes. Slippage and measurement error mean the first correction is rarely perfect. Re-run the extrude with the new E-steps and confirm the error is within about ±1% before trusting the value.
Related tools
- Max Volumetric Flow Rate Calculator
- Steps per mm Calculator
- Print Shrinkage Compensation Calculator
- 3D Print Time Estimator
- Filament Remaining Calculator
- Nozzle Line Width & Layer Height Calculator
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Tip: Enter any known values to calculate the remaining results.
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