A calibrated ruler that keeps going

Measure from any point.

Infinite Ruler turns your iPhone into a practical ruler with centimetres, fractional inches, movable zero and A–B markers—then continues beyond the length of one screen.

Download on theApp Store No account required

$Infinite Ruler measuring a distance with fractional-inch precision and A–B markers$

Centimetres or fractional inchesMovable zero + A–B markersMeasure past one screen

Place the zero yourself

Start exactly where you need.

Move the zero point away from the edge of your phone, then place A and B markers to see a live distance between two real-world points.

Infinite Ruler with a movable zero point and A–B measurement markers

Longer than your phone

Keep measuring past one screen.

Advance the ruler page by page without losing your place. It is the pocket ruler that does not stop at the bottom of the display.

Infinite Ruler continuing a measurement beyond one phone screen

Use the comfortable side

Measure from either edge.

Put the scale and controls on the left or right edge so the ruler fits the object, your hand, and the way you are working.

Infinite Ruler using the right edge of the iPhone for measurement

Built for real objects

Fine-tune your phone.

Use a physical ruler once to calibrate the scale for your device, then keep that adjustment available for future measurements.

Infinite Ruler calibration instructions over the ruler interface

Useful guides

Solve the problem, step by step.

Practical guides that work on their own, with Infinite Ruler introduced where it genuinely helps.

Long measurement guide How to measure something longer than your iPhone screen iPhone ruler guide How to calibrate an iPhone ruler for more accurate measurements

No account, camera or cloud

Your measurements stay on your phone.

Infinite Ruler does not need an account or camera. Measurements and device calibration values remain on your device.

The practical details

Questions, answered.

Does Infinite Ruler support centimetres and inches?

Yes. Measure in centimetres or choose 1/8, 1/16 or 1/32-inch fractional precision.

How can a ruler be longer than the phone?

Use the next and previous controls to continue the scale across multiple ruler pages without resetting the measurement.

How accurate is it?

The app uses device-aware dimensions and provides calibration controls. For accuracy-sensitive work, calibrate it against a physical ruler first.

Keep a ruler in your pocket

Measure from any point.

Download on theApp Store