File:TungstenMetalUSGOV.jpg

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This image has currency in it to indicate scale.

Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.

Ideally, a photograph should include a ruler with the subject (example) or an added scale marking. SI ("metric") units are the most commonly used worldwide (see meter and centimeter).

Images with coins to indicate scale

Common coin diameters for reference:

U.S. dollar (as of?):
- 1¢: 19.05 mm, 0.75 in
- 5¢: 21.21 mm, 0.84 in
- 10¢: 17.91 mm, 0.71 in
- 25¢: 24.26 mm, 0.94 in
- 50¢: 30.61 mm, 1.22 in
- $1: 26.5 mm, 1.02 in

Canadian dollar (as of?):
- 1¢: 19.05 mm, 0.75 in
- 5¢: 21.2 mm, 0.83 in
- 10¢: 18.03 mm, 0.71 in
- 25¢: 23.88 mm, 0.94 in
- 50¢: 27.13 mm, 1.07 in
- $1: 26.5 mm, 1.02 in
- $2: 28 mm, 1.1 in

Pound sterling as of 2021:
- 1p: 20.32 mm, 0.8 in
- 2p: 25.91 mm, 1.02 in
- 5p: 18 mm, 0.71 in
- 10p: 24.5 mm, 0.96 in
- 20p: 21.4 mm, 0.84 in
- 50p: 27.3 mm, 1.07 in
- £1: 23.03–23.43 mm, 0.91–0.92 in
- £2: 28.4 mm, 1.12 in

Euro as of 2002:
- 1c: 16.25 mm, 0.64 in
- 2c: 18.75 mm, 0.74 in
- 5c: 21.25 mm, 0.84 in
- 10c: 19.75 mm, 0.78 in
- 20c: 22.25 mm, 0.88 in
- 50c: 24.25 mm, 0.95 in
- €1: 23.25 mm, 0.92 in
- €2: 25.75 mm, 1.01 in

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English: Tungsten green-silver metal powder. Originaly from Minerals and Materials Photo Gallery.

Slovenščina: Volfram v zeleno-srebrnem prahu. Izvirno s strani Minerals and Materials Photo Gallery.

Uploaded to English Wikipedia by Chris 73.

This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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