1-yen coin (Japan)
20 mm (0.7874 in)
Diameter
Japan's smallest coin, made of pure aluminum since 1955: light enough to float on water. 20 mm across, and it weighs exactly 1 gram.
Published
How big is that?
20 mm is 2.8 times a grain of rice and 23% of a credit card.
1-yen coin is the largest of the 32 Tiny Worlds objects, and the 38th smallest of the 172 objects across all five SizeItUp games.
Closest in size from the other games: Penny (US one cent) (Classic), 19.05 mm across and Nickel (US five cents) (Classic), 21.21 mm across.
Size comparison
To scale, smallest to largest: 1-yen coin in orange beside the Tiny Worlds objects nearest in size, in teal.
| Object | Size | vs 1-yen coin |
|---|---|---|
| German cockroach (Adult)The small brown cockroach of kitchens worldwide, seen from above. | 14.5 mm long | 73% of the size |
| 1 euro cent coinThe smallest euro coin, copper-plated steel. | 16.25 mm across | 81% of the size |
| 1-yen coin (Japan) | 20 mm across | – |
In other units
| Millimetres | 20 |
|---|---|
| Centimetres | 2 |
| Metres | 0.02 |
| Inches | 0.7874 |
| Feet | 0.06562 |
How it's measured
Diameter. Japan Mint specification.
Sources
- mint.go.jp: Japan Mint, circulating coins: 1 yen, diameter 20.0 mm.
- mof.go.jp (supporting): Ministry of Finance Japan: 1 yen, diameter 20.0 mm.
Checked against the source on .
Could you have guessed it by eye?
1-yen coin is one of the objects in Tiny Worlds, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.