Screen Ruler: Phone Measure
Tools Contains ads
On-screen ruler with bank-card calibration β measure in mm, cm, or inches.
- Price
- Free
- No in-app purchases
- Updated
- Oct 17
- 2026 Β· v1.0.0
Screenshots
About Screen Ruler: Phone Measure
π Screen Ruler β turn your phone into a pocket measuring tape
Need a quick length when you donβt have a ruler? Screen Ruler puts millimeter ticks on the edge of the display. Drag the orange guides to the object, read the span, and copy the result. Calibrate once with a bank card so the scale matches real-world mm/cm/in.
No accounts and no cloud β the ruler and your calibration stay on the device.
π How it works
1οΈβ£ Place a bank card on the screen and match the orange β² βΌ to its short edges
2οΈβ£ Save calibration (or skip and use an estimate)
3οΈβ£ Drag the guides to the object you want to measure
4οΈβ£ Switch mm / cm / in and copy the reading
β οΈ Best results after card calibration. Phone DPI alone is often wrong β a real bank card (ISO ID-1 short side β 53.98 mm) is the reference.
π Key features
π Aluminum + tape-style edge ruler
π Drag β² βΌ measure guides
π³ Bank-card calibration saved on device
π’ Units: mm, cm, inches
π Copy measurement
π Reset guides / recalibrate
βοΈ English and Russian
π΄ Works offline after install
π Perfect for
β Quick DIY and craft sizes
β Checking small parts when a tape is elsewhere
β Comparing lengths side by side on the screen
β Everyday mm/cm checks at home or at the desk
β οΈ Important notes
Does NOT replace a certified measuring instrument
Does NOT claim laboratory accuracy without calibration
Does NOT measure distance with the camera β on-screen scale only
Accuracy depends on your calibration and how flat the object sits against the glass
π Privacy first
π No accounts
π Calibration and preferences stay on-device
π No cloud required for measuring
π± Screen Ruler β a clear on-screen scale when you need one
Need a quick length when you donβt have a ruler? Screen Ruler puts millimeter ticks on the edge of the display. Drag the orange guides to the object, read the span, and copy the result. Calibrate once with a bank card so the scale matches real-world mm/cm/in.
No accounts and no cloud β the ruler and your calibration stay on the device.
π How it works
1οΈβ£ Place a bank card on the screen and match the orange β² βΌ to its short edges
2οΈβ£ Save calibration (or skip and use an estimate)
3οΈβ£ Drag the guides to the object you want to measure
4οΈβ£ Switch mm / cm / in and copy the reading
β οΈ Best results after card calibration. Phone DPI alone is often wrong β a real bank card (ISO ID-1 short side β 53.98 mm) is the reference.
π Key features
π Aluminum + tape-style edge ruler
π Drag β² βΌ measure guides
π³ Bank-card calibration saved on device
π’ Units: mm, cm, inches
π Copy measurement
π Reset guides / recalibrate
βοΈ English and Russian
π΄ Works offline after install
π Perfect for
β Quick DIY and craft sizes
β Checking small parts when a tape is elsewhere
β Comparing lengths side by side on the screen
β Everyday mm/cm checks at home or at the desk
β οΈ Important notes
Does NOT replace a certified measuring instrument
Does NOT claim laboratory accuracy without calibration
Does NOT measure distance with the camera β on-screen scale only
Accuracy depends on your calibration and how flat the object sits against the glass
π Privacy first
π No accounts
π Calibration and preferences stay on-device
π No cloud required for measuring
π± Screen Ruler β a clear on-screen scale when you need one
What’s new
Version 1.0.0 Β· Updated October 17, 2026
[New] Init the App