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
Deutsch ∙ English ∙ español ∙ français ∙ Gaeilge ∙ italiano ∙ Plattdüütsch ∙ português ∙ sicilianu ∙ svenska ∙ suomi ∙ македонски ∙ русский ∙ മലയാളം ∙ 한국어 ∙ 日本語 ∙ 中文 ∙ 中文（简体） ∙ עברית ∙ +/−
คำอธิบายAbaloneOutside.jpg
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.
The outside of a Californian red abalone. 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.
ไฟล, abaloneoutside, ไฟล, ประว, ไฟล, หน, าท, ภาพน, การใช, ไฟล, วนกลาง, อม, ลเก, ยวก, บภาพไม, ภาพท, รายละเอ, ยดส, งกว, าน, abaloneoutside, 8206, กเซล, ขนาดไฟล, โลไบต, ชน, ดไมม, image, jpeg, ปภาพหร, อไฟล, เส, ยงน, นฉบ, บอย, คอมมอนส, รายละเอ, ยดด, านล, าง, เป, นข. ifl prawtiifl hnathimiphaphni karichiflswnklang khxmulekiywkbphaphimmiphaphthimiraylaexiydsungkwani AbaloneOutside jpg 8206 431 415 phikesl khnadifl 305 kiolibt chnidimm image jpeg rupphaphhruxiflesiyngni tnchbbxyuthi khxmmxns raylaexiyddanlang epnkhxkhwamthiaesdngphlcak ifltnchbbinkhxmmxns khxmmxnsepnewbistinokhrngkarsahrbekbrwbrwmsuxesri thi khunsamarthchwyid 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 Deutsch nbsp English nbsp espanol nbsp francais nbsp Gaeilge nbsp italiano nbsp Plattduutsch nbsp portugues nbsp sicilianu nbsp svenska nbsp suomi nbsp makedonski nbsp russkij nbsp മലയ ള nbsp 한국어 nbsp 日本語 nbsp 中文 nbsp 中文 简体 nbsp עברית nbsp khaxthibayAbaloneOutside jpg 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 wnthi phvsphakhm ph s 2548 aehlngthima ngankhxngtw phusrangsrrkh Kowloonese xnuyatihkhdlxk aeckcayaela hruxddaeprexksarniphayitenguxnikhkhxngsyyaxnuyatexksaresrikhxngknu run 1 2 hruxrunid nbcaknithixxkodymulnithisxftaewresri odyimmiswnidhamaekikh immikhxkhwampkhnaaelapkhlng saenakhxngsyyaxnuyatrwmxyuinswnchux syyaxnuyatexksaresrikhxngknuhttp www gnu org copyleft fdl html GFDL GNU Free Documentation License true true iflnixyuphayitsyyaxnuyat khriexthifkhxmmxns aebbaesdngthima xnuyataebbediywkn 3 0 tnchbb khunsamarth thicaaebngpn thicathasaena aeckcay aelasngngandngklawtxip thicaeriyberiyngihm thicaddaeplngngandngklaw phayitenguxnikhtxipni aesdngthima khuntxngihekiyrtiecakhxngnganxyangehmaasm odyephimlingkipyngsyyaxnuyat aelarabuhakmikarepliynaeplng khunxacthaechnniidinrupaebbidkidtamkhwr aettxngimichinlksnathiaenawaphuihxnuyatsnbsnunkhunhruxkarichngankhxngkhun xnuyataebbediywkn hakkhunddaeplng epliynrup hruxtxetimnganni khuntxngichsyyaxnuyataebbediywknhruxaebbthiehmuxnkbsyyaxnuyatthiichkbnganniethann payaesdngsthanalikhsiththinithukephimephuxihepniptamkarepliynaeplngsyyaxnuyatkhxngmulnithiwikimiediy cak GFDL ipyng GFDL khwbkhukb CC BY SA 3 0 http creativecommons org licenses by sa 3 0 CC BY SA 3 0 Creative Commons Attribution Share Alike 3 0 true truekhabrryayodyyxithyephimkhabrryaythrrthdediywephuxkhyaykhwamwaiflnimixairixethmthiaesdngxyuiniflniprakxbdwysthanalikhsiththimilikhsiththisyyaxnuyatCreative Commons Attribution ShareAlike 3 0 Unported nbsp xngkvsGNU Free Documentation License version 1 2 or lateral nbsp xngkvsthimakhxngiflkarsrangdngedimodyphuxpohldwnthisrang wnkxtngphvsphakhm 2005exposure time nbsp xngkvs0 0025 winathif number nbsp xngkvs5 6focal length nbsp xngkvs8 milliemtrISO speed nbsp xngkvs100MIME type nbsp xngkvsimage jpegepnphaphthaychecksum nbsp xngkvs93761e84eb8fa6cd4d238e4b10b5dce5813fd589withikarkahnd SHA 1 nbsp xngkvsdata size nbsp xngkvs311 934 ibtkhwamsung415 phikeslkhwamkwang431 phikesl prawtiifl khlikwnthi ewlaephuxduiflthipraktinkhnann wnthi ewlarupyxkhnadphuichkhwamehn pccubn01 15 19 kumphaphnth 2553431 415 305 kiolibt Snek01cropped 02 26 28 mithunayn 2548640 480 198 kiolibt MaracThe outside of a Californian red abalone 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 hnathimiphaphni hnatxipni oyngmathiphaphni hxyepahux karichiflswnklang wikixuntxipniichiflni karichbn ca wikipedia org Orella de mar karichbn ceb wikipedia org Haliotis rufescens karichbn de wikipedia org Rotes Seeohr karichbn en wikipedia org Haliotis rufescens Haliotoidea karichbn es wikipedia org Haliotis Haliotis rufescens karichbn et wiktionary org punane merikorv karichbn fr wiktionary org t aya karichbn hak wikipedia org Pau ǹg karichbn id wikipedia org Abalon karichbn jv wikipedia org Abalon karichbn ko wikipedia org 전복 karichbn min wikipedia org Templat Lai Tau Sanak Mai karichbn ms wikipedia org Abalon karichbn no wikipedia org Haliotoidea karichbn sk wikipedia org Usovite karichbn species wikimedia org Haliotoidea Haliotis karichbn sr wikipedia org Abalon karichbn sv wikipedia org Haliotis rufescens karichbn tr wikipedia org Denizkulagi hayvan karichbn uk wikipedia org Abalon karichbn vi wikipedia org Bao ngư Lien họ Bao ngư karichbn www wikidata org Q3126011 karichbn zh min nan wikipedia org Pau hi karichbn zh wikipedia org 鮑魚 鮑總科khxmulekiywkbphaph phaphnimikhxmulephimetim sungswnihymacakklxngdicitxlhruxsaeknenxrthisamarthekbkhxmuldngklawiwrwmkbphaphid thaphaphnithukprbprungaekikhhruxepliynaeplngcakedim khxmulbangxyangcayngkhngimepliynaeplngehmuxnphaphthithukprbprungaekikhnnphuphlitklxngSONYrunkhxngklxngCYBERSHOTewlaepidhnaklxng1 400 winathi 0 0025 khaexff 5 6xtrakhwamerw ISO100ewlathibnthukphaph09 58 24 phvsphakhm 2548khwamyawofkselns8 mm karcdwangphaphpktikhwamlaexiydaenwnxn72 dpikhwamlaexiydaenwtng72 dpisxftaewrthiichGIMP 2 6 7aekikhphaphlasud19 14 18 kumphaphnth 2553taaehnng Y aela CCo sitedopraekrmexksophechxropraekrmpktirunexksif Exif 2 2ewlathiaeplngepndicithl09 58 24 phvsphakhm 2548khwamhmaykhxngaetlakhxmophenntY Cb Cr immikhaohmdkarbibxdphaph2karchdechyaesng0rurbaesngkwangsud3 APEX f 2 83 ohmdkarwdaesngaephtethirnaesngimthrabaeflchimichaeflchrunaeflchphiksthirxngrb1sepssisRGBtnchbbiflklxngthayphaphningdicithlchnidsinphaphthayodytrngkarpramwlphaphophlessspktiohmdexksophechxrexksophechxrxtonmtiiwtbalansiwtbalansxtonmtichnidsinaekhpecxrpkti ekhathungcak https th wikipedia org wiki ifl AbaloneOutside jpg, wikipedia, วิกิ หนังสือ, หนังสือ, ห้องสมุด,
