Online Inch Ruler with 1/16-Inch Marks

Use a calibrated inch ruler for small physical measurements. The scale includes common fractional marks so you can read halves, quarters, eighths and sixteenths.

Calibration is stored only in this browser.
0
Drag across the ruler to measure a span.
⌨ Keyboard shortcuts

C cm · I inch · P px · R rotate · F fullscreen · G guides · X crosshair · A angle · D dark · 4 four edges

Calibrate1Ruler

Match a standard bank card width (85.60 mm) to the guide below.

85.60 mm

How to read the inch scale

Each inch is divided into 16 equal parts. The longest intermediate mark is the half-inch, followed by quarter-inch and eighth-inch marks, with the shortest ticks showing sixteenths. This stepped pattern makes common fractions easier to identify at a glance.

Decimal and fractional measurements

Drag across the ruler to see a decimal-inch value. The measurement output also provides a practical sixteenth-inch fraction, useful when matching common tape-measure or hardware dimensions.

Calibrate the screen first

An inch is a physical unit, so an uncalibrated browser cannot guarantee a true one-inch length on every device. Match a standard 85.60 mm bank card or use the known screen diagonal, then keep the same display scale while measuring.

When an inch ruler is useful

  • Small hardware, craft pieces and printed parts.
  • Checking dimensions given in US customary units.
  • Comparing an inch measurement with the metric scale without changing tools.