Penny (US one cent)
19.05 mm (0.75 in)
Diameter
The copper-coloured US cent. Now struck only for collector sets. Diameter: 19.05 mm.
Published
How big is that?
19.05 mm is 22% of a credit card.
Penny is the 2nd smallest of the 39 Classic objects, and the 2nd smallest of the 109 objects across all three SizeItUp games.
Size comparison
To scale, smallest to largest: Penny in orange beside the Classic objects nearest in size, in teal.
| Object | Size | vs Penny |
|---|---|---|
| Dime (US ten cents)The smallest US coin, worth ten cents. | 17.91 mm across | 94% of the size |
| Penny (US one cent) | 19.05 mm across | – |
| Nickel (US five cents)The US five-cent coin. | 21.21 mm across | 1.1× bigger |
| US quarterThe 25-cent coin of the United States. | 24.26 mm across | 1.3× bigger |
In other units
| Millimetres | 19.05 |
|---|---|
| Centimetres | 1.905 |
| Metres | 0.01905 |
| Inches | 0.75 |
| Feet | 0.0625 |
How it's measured
Diameter. US Mint coin specifications.
Sources
- usmint.gov: US Mint coin specifications: penny diameter 0.750 in., 19.05 mm.
- web.archive.org (supporting): Archived copy of the same page, 21 Oct 2026.
Checked against the source on .
Could you have guessed it by eye?
Penny is one of the objects in Classic, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.