Image:Challengecoins.jpg

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[edit] Summary

Two challenge coins and an American quarter-dollar for scale.

U.S. quarter

This image has a coin in it to indicate scale.

Do not use object such as coins for scale, as they 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 are particularly bad as they can reinforce a geographical bias.

Please photograph a ruler with the subject or add a scale marking via an image editor instead.

Examples of good practice: with (metric & imperial) ruler and with superimposed line.
Examples of bad practice: here.

A tape measure

Common coin diameters for reference:

  • U.S. and Canada:
    • 1¢: 19 mm, 0.75 in;
    • 5¢: 20 mm, 0.79 in;
    • 10¢: 18 mm, 0.71 in;
    • 25¢: 24 mm, 0.95 in;
    • 50¢: 30 mm, 1.18 in;
    • $1: 26 mm, 1.02 in;
    • $2: 28 mm, 1.10 in.
  • UK
    • 1p: 20.32 mm, 0.80 in;
    • 2p: 25.91 mm, 1.02 in;
    • 5p: 18.00 mm, 0.71 in;
    • 10p: 24.50 mm, 0.96 in;
    • 20p: 21.40 mm, 0.84 in;
    • 50p: 27.30 mm, 1.07 in;
    • £1: 22.50 mm, 0.89 in;
    • £2: 28.40 mm, 1.12 in.
  • Eur
    • 1¢: 16.25 mm,
    • 2¢: 18.75 mm,
    • 5¢: 21.25 mm,
    • 10¢: 19.75 mm,
    • 20¢: 22.25 mm,
    • 50¢: 24.25 mm,
    • 1€: 23.25 mm,
    • 2€: 25.75 mm,
Public domain

This image has been (or is hereby) released into the public domain by its creator, the Epopt. This applies worldwide.
In case this is not legally possible,
the creator grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Subject to disclaimers.

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