Online ruler
A ruler at actual size on any screen. Match a bank card to the outline once, then measure anything small.
2⅞in
7.3 cm · 73 mm
Not calibrated yet · standard screen size
Hold a bank card against the screen and match the outline.
Bank card · 3⅜ × 2⅛ in
How to use it
- 1Hold a bank card against the screen and match the outline.
- 2Put the thing you are measuring on the ruler, against the 0.
- 3Read the yellow line, in inches and fractions.
This page, or the app?
| This page | Tapepal on iPhone | |
|---|---|---|
| Length | Up to the width of your screen | Anything your camera can see |
| Setup | Match a bank card first | Point and tap |
| Saved | Gone when you close the tab | Saved with the photo |
Questions
Why do I need a bank card?
Screens have different pixel sizes. A bank card is always 3⅜ in wide, so matching it tells the page how big an inch is on your screen.
Is it accurate?
Once calibrated, to about 1/16 in on most screens.
Does it work on a phone?
Yes, but a phone screen is short. For longer things, use the camera.
