How many steps per revolution does a 1.8 degree motor have?

A full step is 1.8 degrees, so one revolution is 360 / 1.8 = 200 full steps. That is the most common NEMA 17 motor used in 3D printers. A 0.9 degree motor doubles the resolution to 400 full steps per revolution. Microstepping multiplies this further: 200 full steps at 1/16 microstepping become 3200 steps per revolution, which is the figure the driver actually emits.

What does microstepping change in the numbers?

Microstepping subdivides each full step into smaller increments for smoother, quieter motion. The divisor multiplies steps per revolution directly: a 1.8 degree motor gives 200 steps at full step, 1600 at 1/8, and 3200 at 1/16. Steps per mm scale by the same factor, so doubling microstepping doubles steps/mm. Note that microsteps add resolution but not proportional accuracy, since torque per microstep drops as the divisor rises.

How do I get steps/mm for a leadscrew axis?

Steps per mm equals steps per revolution divided by the screw lead in mm. A 1.8 degree motor at 1/16 microstepping gives 3200 steps per revolution; on a T8 leadscrew with an 8 mm lead that is 3200 / 8 = 400 steps/mm. Watch the lead versus pitch distinction: a 4-start T8 screw has 2 mm pitch but 8 mm lead, and the lead is the value that matters here.

How do I get steps/mm for a belt and pulley axis?

First find the travel per revolution: belt pitch times pulley teeth. A GT2 belt has 2 mm pitch, so a 20-tooth pulley moves 40 mm per revolution. Steps per mm is then steps per revolution divided by that distance: 3200 / 40 = 80 steps/mm for a 1.8 degree motor at 1/16 microstepping. This is the typical value for the X and Y axes of a CoreXX or bedslinger printer.

Where do I paste the steps/mm value in firmware?

In Marlin it goes into DEFAULT_AXIS_STEPS_PER_UNIT in Configuration.h, or you set it live with M92 then save with M500. In Klipper you do not enter steps/mm directly; instead the printer computes it from rotation_distance, full_steps_per_rotation and microsteps. Use this tool to confirm the math: rotation_distance for a belt axis is just belt pitch times pulley teeth, the same mm per revolution shown here.

How do I calibrate steps/mm if the calculated value is slightly off?

The calculated value is the theoretical starting point. To trim it, command a move (say 100 mm), measure the real travel with calipers, then scale: new steps/mm = old steps/mm times commanded distance / measured distance. If 100 mm commanded actually moved 98 mm, multiply your steps/mm by 100 / 98. Belt and leadscrew axes are usually within a percent of theory; extruder E-steps drift more and need this measured calibration most.

Set steps/mm for a fresh Marlin build

You just flashed Marlin on a printer and the axes move the wrong distance. Drop in 1.8 degrees, your driver's microstepping, and the mechanics of each axis — leadscrew lead for Z, GT2 pitch and pulley teeth for X and Y. The tool hands you the exact steps/mm to paste into DEFAULT_AXIS_STEPS_PER_UNIT, so a commanded 100 mm actually moves 100 mm before you even reach for the calipers.

Check a Klipper rotation_distance

Klipper wants rotation_distance, not steps/mm, and it is easy to enter the wrong number. Use belt mode to get mm per revolution: GT2 at 2 mm times a 20-tooth pulley is 40 mm, which is rotation_distance directly. For Z, the leadscrew lead is the rotation_distance. Cross-check the resulting steps/mm against what Klipper computes and you catch a wrong pulley count immediately.

Plan a CNC axis around a target resolution

Building a CNC and want at least 0.01 mm of positioning resolution per step? Try a T8 leadscrew at 8 mm lead with 1/16 microstepping: 3200 steps per revolution gives 400 steps/mm, or 0.0025 mm per step, well inside the target. Swap to a 2 mm lead screw or change microstepping and watch the resolution move until the mechanics match your spec.

Convert a move into a step count for a controller

Driving steppers from a microcontroller or G-code by raw step counts? Enter your steps/mm setup and a travel distance to read out exactly how many steps a move costs — 400 steps/mm over 10 mm is 4000 steps. The inverse also holds, so you can confirm a 4000-step pulse train lands the carriage at 10 mm, not 9.8.

Stepper Motor Steps Calculator — Steps per mm and per Revolution

Step angle + microstepping + transmission → steps/rev, steps/mm, steps for any travel — Marlin/Klipper config, browser-only

Runs locally
Category Calculator
Best for Getting a realistic range before a purchase, plan, workout, or schedule decision.

Step angle (deg/step)1.8° = 200 steps/rev · 0.9° = 400 steps/rev

Microstepping

Screw lead (mm/rev)e.g. T8 leadscrew = 8 mm

Travel distance (mm)

Steps per revolution

3200

Steps per millimetre

400

paste into firmware steps/mm

mm per revolution

8 mm

Steps for travel

4000 steps

What this tool does

Free stepper motor steps calculator for 3D printers and CNC machines. Turn the three numbers your firmware needs out of three you already know: enter the motor step angle (1.8 degrees gives 200 full steps per revolution, 0.9 degrees gives 400), pick the driver microstepping divisor (1, 2, 4, 8, 16 or 32), and describe the axis transmission. For a leadscrew or threaded rod give the lead in mm per revolution, for example a T8 leadscrew at 8 mm; for a belt drive give the belt pitch (GT2 is 2 mm) and the pulley tooth count. The tool returns steps per revolution, mm moved per revolution, and the steps per millimetre value you paste straight into Marlin DEFAULT_AXIS_STEPS_PER_UNIT or use to derive a Klipper rotation_distance. Enter a travel distance and it also shows exactly how many steps that move costs, so you can sanity-check a calibration jog before sending it. One click copies the steps/mm or a full summary, and the shareable URL reproduces your exact configuration. Everything runs in your browser, no upload, no account.

Tool details

Input: Numbers; The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output: Live result + Copy; The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy: Browser-side processing; The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share: Shareable URL state; Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget: Initial JS <= 9 KB; No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit: Calculator · Developer; Category and role tags drive related tools, internal links, and quick fit checks.

How to use

1. Input

Paste or drop your content into the tool panel.
2. Process

Click the button. All processing is local in your browser.
3. Copy / Download

Copy the result or download to disk in one click.

How Stepper Motor Steps Calculator fits into your work

Use it for fast estimates, comparisons, and planning numbers before you make the final call.

Calculation jobs

Getting a realistic range before a purchase, plan, workout, or schedule decision.
Comparing scenarios by changing one input at a time.
Turning rough assumptions into a number you can discuss.

Calculation checks

Double-check units, dates, rates, and rounding assumptions.
Treat health, finance, tax, and legal outputs as planning aids, not professional advice.
Save the inputs that produced an important result so you can reproduce it later.

Good next steps

These links move the current task into a more complete workflow.

Real-world use cases

Set steps/mm for a fresh Marlin build
You just flashed Marlin on a printer and the axes move the wrong distance. Drop in 1.8 degrees, your driver's microstepping, and the mechanics of each axis — leadscrew lead for Z, GT2 pitch and pulley teeth for X and Y. The tool hands you the exact steps/mm to paste into DEFAULT_AXIS_STEPS_PER_UNIT, so a commanded 100 mm actually moves 100 mm before you even reach for the calipers.
Check a Klipper rotation_distance
Klipper wants rotation_distance, not steps/mm, and it is easy to enter the wrong number. Use belt mode to get mm per revolution: GT2 at 2 mm times a 20-tooth pulley is 40 mm, which is rotation_distance directly. For Z, the leadscrew lead is the rotation_distance. Cross-check the resulting steps/mm against what Klipper computes and you catch a wrong pulley count immediately.
Plan a CNC axis around a target resolution
Building a CNC and want at least 0.01 mm of positioning resolution per step? Try a T8 leadscrew at 8 mm lead with 1/16 microstepping: 3200 steps per revolution gives 400 steps/mm, or 0.0025 mm per step, well inside the target. Swap to a 2 mm lead screw or change microstepping and watch the resolution move until the mechanics match your spec.
Convert a move into a step count for a controller
Driving steppers from a microcontroller or G-code by raw step counts? Enter your steps/mm setup and a travel distance to read out exactly how many steps a move costs — 400 steps/mm over 10 mm is 4000 steps. The inverse also holds, so you can confirm a 4000-step pulse train lands the carriage at 10 mm, not 9.8.

Common pitfalls

Confusing leadscrew lead with thread pitch. A multi-start T8 screw has a 2 mm pitch but an 8 mm lead, and one motor revolution advances by the lead, not the pitch. Feed the lead (mm per revolution), or your steps/mm will be four times too high on a 4-start screw.
Forgetting to multiply by microstepping. Plugging 200 steps per revolution into a 1/16 setup undercounts by sixteen and every move ends up far too short. Always use the effective steps per revolution (200 times the divisor), which is what this tool reports.
Mixing belt pitch with belt tooth spacing labels. GT2 means a 2 mm pitch, not a 2 GT designation for something else; multiply pitch by pulley teeth, not by belt length. A 20-tooth GT2 pulley travels 40 mm per revolution, the number steps/mm divides by.

Privacy

Every calculation — steps per revolution, the mm-per-revolution geometry, steps per mm and the step count for a move — is plain JavaScript that runs in your browser tab. No motor specs, machine dimensions or firmware values ever leave the page, and nothing is logged. The one caveat: the shareable URL encodes your inputs in the query string, so a share link pasted into chat records those numbers in the recipient server's access log. The values here are not sensitive, but if you would rather not share a build's exact geometry, use the copy button and paste the text instead of the URL.

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Stepper Motor Steps Calculator — Steps per mm and per Revolution

What this tool does

Tool details

How to use

1. Input

2. Process

3. Copy / Download

How Stepper Motor Steps Calculator fits into your work

Calculation jobs

Calculation checks

Good next steps

Real-world use cases

Set steps/mm for a fresh Marlin build

Check a Klipper rotation_distance

Plan a CNC axis around a target resolution

Convert a move into a step count for a controller

Common pitfalls

Privacy

FAQ

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