{"id":37432,"date":"2026-10-13T17:49:06","date_gmt":"2026-10-14T00:49:06","guid":{"rendered":"https:\/\/96jewelry.com\/?page_id=37432"},"modified":"2026-10-14T01:45:06","modified_gmt":"2026-10-14T08:45:06","slug":"ring-size-converter","status":"publish","type":"page","link":"https:\/\/96jewelry.com\/fr\/ring-size-converter\/","title":{"rendered":"Ring Size Converter"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"37432\" class=\"elementor elementor-37432\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d9af327 e-flex e-con-boxed e-con e-parent\" data-id=\"d9af327\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-450dbb9 elementor-widget elementor-widget-html\" data-id=\"450dbb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"rsc\" aria-labelledby=\"rsc-title\">\r\n<div class=\"brand\">96JEWELRY \u00b7 SIZE GUIDE<\/div>\r\n<h1 id=\"rsc-title\">Ring Size Converter<\/h1>\r\n<p class=\"intro\">Start with a known size or an inner measurement. See approximate equivalents across four sizing systems.<\/p>\r\n<div class=\"inputs\">\r\n <div><label for=\"rsc-system\">Your sizing system<\/label><select id=\"rsc-system\">\r\n <option value=\"us\">US \/ Canada<\/option><option value=\"uk\">UK \/ Australia<\/option><option value=\"eu\">EU \u2014 circumference size<\/option><option value=\"jp\">Japan (JP)<\/option><option value=\"diameter\">Inner diameter (mm)<\/option><option value=\"circumference\">Inner circumference (mm)<\/option>\r\n <\/select><\/div>\r\n <div><label for=\"rsc-size\">Your size<\/label><div id=\"rsc-input\"><\/div><\/div>\r\n<\/div>\r\n<p id=\"rsc-help\" class=\"note\"><\/p>\r\n<div id=\"rsc-error\" role=\"alert\"><\/div>\r\n<div id=\"rsc-results\" aria-live=\"polite\" aria-atomic=\"true\"><\/div>\r\n<button id=\"rsc-reset\" type=\"button\">Reset to US 7<\/button>\r\n<p class=\"note\">Sizes are approximate and use the GIA reference chart. EU here means the inner circumference in millimeters, rounded to the nearest whole size; it is not the Swiss sizing system. JP results use the Japan entries in the chart. Brands and gauges may differ.<\/p>\r\n<p class=\"note\">For custom manufacturing, confirm the finished inner diameter, tolerance, band width and approved sample with your supplier. This converter does not determine finger fit or compensate for wide bands.<\/p>\r\n<details><summary>View reference chart &amp; method<\/summary>\r\n<p class=\"note\">US and UK values are looked up from the chart, not generated with a linear formula. Measurements use C = \u03c0 \u00d7 D. Each result independently selects the nearest available reference size; an exact halfway value selects the larger size. Results outside a system's reference range show \u201cOutside chart\u201d. Dimensions in the source are rounded to 0.1 mm.<\/p>\r\n<p class=\"note\">Reference: <a href=\"https:\/\/www.gia.edu\/quality-assurance-benchmark\/accurate-determination-finger-ring-size\" target=\"_blank\" rel=\"noopener noreferrer\">GIA \u2014 International Ring Size Chart<\/a>. Supported US range: 3\u201312.5; UK: F\u2013Y; JP: 4\u201326. EU and measurement inputs cover the same diameter range, 14.1\u201321.8 mm.<\/p>\r\n<div class=\"table-wrap\"><table><caption>Approximate size equivalents<\/caption><thead><tr><th scope=\"col\">US<\/th><th scope=\"col\">UK<\/th><th scope=\"col\">EU \u2248<\/th><th scope=\"col\">JP<\/th><th scope=\"col\">Inner \u00d8 mm<\/th><th scope=\"col\">Inner C mm<\/th><\/tr><\/thead><tbody id=\"rsc-chart\"><\/tbody><\/table><\/div>\r\n<\/details>\r\n<\/section>\r\n<script>\r\n(() => {\r\n 'use strict';\r\n \/\/ Transcribed numeric reference facts from GIA's linked chart.\r\n \/\/ null means no JP equivalent was specified for that row; do not invent it.\r\n const diameters=[14.1,14.3,14.5,14.7,14.9,15.1,15.3,15.5,15.7,15.9,16.1,16.3,16.5,16.7,16.9,17.1,17.3,17.5,17.7,17.9,18.1,18.3,18.5,18.8,19,19.2,19.4,19.6,19.8,20,20.2,20.4,20.6,20.8,21,21.2,21.4,21.6,21.8];\r\n const japan=[4,5,null,6,7,null,8,null,9,null,10,null,11,12,13,null,14,null,15,null,16,null,17,null,18,null,19,null,20,21,22,null,23,null,24,null,25,null,26];\r\n const rows=diameters.map((d,i)=>({diameter:d,circumference:d*Math.PI,us:3+i\/4,uk:String.fromCharCode(70+Math.floor(i\/2))+(i%2?'\u00bd':''),jp:japan[i]}));\r\n const root=document.getElementById('rsc');\r\n const $=id=>root.querySelector('#rsc-'+id);\r\n const format=n=>Number(n.toFixed(2)).toString();\r\n const minD=diameters[0],maxD=diameters.at(-1);\r\n function nearest(d,list) {\r\n   if(d<list[0].diameter-1e-9||d>list.at(-1).diameter+1e-9)return null;\r\n   return list.reduce((a,b)=>Math.abs(b.diameter-d)<=Math.abs(a.diameter-d)+1e-10?b:a);\r\n }\r\n function convert(system,value) {\r\n   if(system==='us'||system==='uk'||system==='jp') {\r\n     const row=rows.find(r=>String(r[system])===String(value)&&r[system]!==null);\r\n     if(!row)throw new Error('Choose a size from the list.');\r\n     return row.diameter;\r\n   }\r\n   if(typeof value==='string'&&!value.trim())throw new Error('Enter a measurement or EU size.');\r\n   const n=Number(value);\r\n   if(!Number.isFinite(n)||n<=0)throw new Error('Enter a valid positive number.');\r\n   if(system==='eu'&&!Number.isInteger(n))throw new Error('Enter a whole EU size.');\r\n   const d=system==='diameter'?n:n\/Math.PI;\r\n   if(d<minD-1e-9||d>maxD+1e-9)throw new Error('Outside this reference chart. Use diameter 14.1\u201321.8 mm, circumference '+(minD*Math.PI).toFixed(2)+'\u2013'+(maxD*Math.PI).toFixed(2)+' mm, or EU 45\u201368.');\r\n   return d;\r\n }\r\n function render() {\r\n   $('error').textContent='';\r\n   $('results').replaceChildren();\r\n   try {\r\n     const d=convert($('system').value,$('size').value);\r\n     const r=nearest(d,rows),j=nearest(d,rows.filter(r=>r.jp!==null));\r\n     const cards=[['US \/ Canada',format(r.us),'nearest chart size'],['UK \/ Australia',r.uk,'nearest chart size'],['EU',String(Math.round(d*Math.PI)),'approx. circumference size'],['Japan (JP)',j?String(j.jp):'Outside chart','nearest listed JP size'],['Inner diameter',d.toFixed(2)+' mm','measurement \/ reference'],['Inner circumference',(d*Math.PI).toFixed(2)+' mm','calculated from diameter']];\r\n     const wrap=document.createElement('div');wrap.className='cards';\r\n     cards.forEach(([label,value,note])=>{\r\n       const card=document.createElement('div');card.className='card';\r\n       const name=document.createElement('span');name.textContent=label;\r\n       const result=document.createElement('span');result.className='value';result.textContent=value;\r\n       const detail=document.createElement('small');detail.textContent=note;\r\n       card.append(name,result,detail);wrap.append(card);\r\n     });\r\n     $('results').append(wrap);\r\n   }catch(error){$('error').textContent=error.message;}\r\n }\r\n function setInput() {\r\n   const system=$('system').value;\r\n   const discrete=['us','uk','jp'].includes(system);\r\n   const input=document.createElement(discrete?'select':'input');\r\n   input.id='rsc-size';input.setAttribute('aria-describedby','rsc-help rsc-error');\r\n   if(discrete){\r\n     rows.filter(r=>r[system]!==null).forEach(r=>{const option=document.createElement('option');option.value=r[system];option.textContent=r[system];input.append(option)});\r\n     input.value=system==='us'?'7':system==='uk'?'N':'14';\r\n   }else{\r\n     input.type='number';input.inputMode='decimal';\r\n     input.step=system==='eu'?'1':'any';\r\n     input.min=system==='diameter'?minD:system==='eu'?45:minD*Math.PI;\r\n     input.max=system==='diameter'?maxD:system==='eu'?68:maxD*Math.PI;\r\n     input.value=system==='diameter'?'17.3':system==='eu'?'54':'54.35';\r\n   }\r\n   input.addEventListener(discrete?'change':'input',render);\r\n   $('input').replaceChildren(input);\r\n   $('help').textContent=discrete?'Select a listed reference size.':system==='eu'?'Enter a whole circumference-based EU size (45\u201368).':'Measure the inside of a round ring in millimeters, not its outside diameter.';\r\n   render();\r\n }\r\n rows.forEach(r=>{const tr=document.createElement('tr');[format(r.us),r.uk,Math.round(r.circumference),r.jp??'\u2014',r.diameter.toFixed(1),r.circumference.toFixed(2)].forEach(v=>{const td=document.createElement('td');td.textContent=v;tr.append(td)});$('chart').append(tr)});\r\n $('system').addEventListener('change',setInput);\r\n $('reset').addEventListener('click',()=>{$('system').value='us';setInput()});\r\n setInput();\r\n})();\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>96JEWELRY \u00b7 SIZE GUIDE Ring Size Converter Start with a known size or an inner measurement. See approximate equivalents across four sizing systems. Your sizing systemUS \/ CanadaUK \/ AustraliaEU \u2014 circumference sizeJapan (JP)Inner diameter (mm)Inner circumference (mm) Your size Reset to US 7 Sizes are approximate and use the GIA reference chart. EU here [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"Convert US, UK, EU and Japanese ring sizes, or look up sizes using inner diameter and circumference in 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