MotionShine01 / Why
Screens differ
A browser's "inch" is not a real inch on most screens, so the ruler needs a reference.
Free tool
Online ruler, set to true size.
A ruler on your screen in centimetres and millimetres or inches in sixteenths. Screens differ, so set it up once: hold any bank card against the screen and move the slider until the box matches it, or type your screen's diagonal. After that the marks are true size on this screen. Drag along the ruler to read a length, or turn it upright for taller things.
Marker:
Set it up: match a bank card
Hold a bank card here and match its size
Or type your screen size
Bank cards share one size: 85.60 x 53.98 mm (ID-1). The setting is for this screen and browser zoom.
Your setting is kept in this browser. Nothing is sent anywhere.
True to size
Set once, measure any time.
02 / Card
A size everyone has
Bank cards, ID cards and many loyalty cards share the ID-1 size, 85.60 by 53.98 mm.
03 / Measure
Drag the marker
Drag along the ruler to read a length in centimetres or inches and fractions.
Questions
Good to know.
Is the online ruler actual size?
After you set it up with a card or your screen size, yes, on this screen. Before that it is only close.
How do I set it up?
Hold a bank card flat against the screen and move the slider until the box matches the card.
Does browser zoom change it?
Yes. Set it up again if you zoom the page in or out.
Can I measure in inches?
Yes, in sixteenths. Pick Inches.
Can I use it on a phone?
Yes, but phone screens are short; turn it upright or measure in parts.