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U.S. quarter

This image has currency in it to indicate scale.

Avoid using objects 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, and some coins' designs are copyrighted.

Ideally, a photograph should include a ruler with the subject (as seen in this photo) or add a scale marking via an image editor instead (as seen in this photo). SI ("metric") units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of bad practice: here.

A tape measure

Common coin diameters for reference:

  • U.S. dollar:
    • 1¢: 19.05 mm , 0.75 in
    • 5¢: 21.21 mm , 0.79 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:
    • 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
    • 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: 22.5 mm , 0.89 in
    • £2: 28.4 mm , 1.12 in
  • Euro
    • 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

English: The outside of a Californian red abalone, Haliotis rufescens. This red abalone was harvested on North California coast in May, 2005. An American quarter dollar coin is included in the picture to provide scale. The picture shows some sea plants growing on top of the shell. Note the 4 holes on the right hand side.
Date May 2005(2005-05)
Source Own work
Author Kowloonese
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
This licensing tag was added to this file as part of the GFDL licensing update.

GNU Free Documentation License


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EXIF data:
File name abaloneoutside.jpg
Size, bytes 311934
Mime type image/jpeg
Image input equipment manufacturer SONY
Image input equipment model CYBERSHOT
Orientation of image 1
Image resolution in width direction 72/1
Image resolution in height direction 72/1
Unit of X and Y resolution 2
Exposure time 10/4000
F number 56/10
Exposure program 2
ISO speed rating 100
Compressed bits per pixel 2/1
Exif version 0220
Lens focal length 80/10
Date and time original image was generated 2005:05:24 09:58:57
Date and time image was made digital data 2005:05:24 09:58:57
Meaning of each component 
Exposure bias 0/10
Maximum lens aperture 48/16
Metering mode 5
Supported Flashpix version 0100
Color space information 1
Exif image width 431
Exif image length 415
Scene type 
Software used GIMP 2.6.7
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