{"id":100096,"date":"2026-02-15T20:16:23","date_gmt":"2026-02-15T20:16:23","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100096"},"modified":"2026-07-12T05:32:24","modified_gmt":"2026-07-12T05:32:24","slug":"flange-gasket-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bg\/calculators\/flange-gasket-calculator\/","title":{"rendered":"Annular Gasket Geometry | Area, Width &#038; Envelope Volume"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Annular Gasket Geometry from Documented Dimensions\",\"description\":\"Calculate nominal annulus width,mean diameter,gross plan area,circumferences and ideal solid-envelope volume from documented gasket ID,OD and thickness. No standards lookup or bolt-load result.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/flange-gasket-calculator\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-12\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this calculator select an ASME gasket size?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Enter dimensions from the controlling drawing,manufacturer specification or licensed standard. The page does not reproduce B16.20,B16.21 or B16.5 tables.\"}},{\"@type\":\"Question\",\"name\":\"Does gross annular area determine gasket seating load?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Gross geometric plan area is not the effective gasket area or a seating-load calculation. Joint design requires the applicable method,qualified gasket parameters and complete service\/joint inputs.\"}}]}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Annular gasket geometry\",\"item\":\"https:\/\/vibromera.eu\/calculators\/flange-gasket-calculator\/\"}]}<\/script>\r\n<link rel=\"preconnect\" 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print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\r\r\n\r\r\n.vc-form-grid-annulus{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.vc-field-source{grid-column:1\/-1}.vc-result-note{margin:0;color:var(--vc-ink-secondary);font-size:13px}@media(max-width:650px){.vc-form-grid-annulus{grid-template-columns:1fr}.vc-field-source{grid-column:auto}}\r\r\n<\/style>\r\n<div class=\"vc-calculator\" id=\"vc-gasket-annulus\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Documented dimensions required \u2014 geometry only<\/p><h1 class=\"vc-header-title\">Annular Gasket Geometry<\/h1><p class=\"vc-header-subtitle\">Calculate nominal geometry from an identified gasket inner diameter,outer diameter and uncompressed thickness. No standard size,material or bolt load is inferred.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">b=(D\u2092\u2212D\u1d62)\/2<\/span><span class=\"vc-badge\">A=\u03c0(D\u2092\u00b2\u2212D\u1d62\u00b2)\/4<\/span><span class=\"vc-badge\">mm or in<\/span><\/div><\/header>\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-form-grid-annulus\">\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-unit\">Length unit<\/label><select class=\"vc-select\" id=\"vc-unit\"><option value=\"\">Select\u2026<\/option><option value=\"mm\">millimetres (mm)<\/option><option value=\"in\">inches (in)<\/option><\/select><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-id\">Gasket inner diameter, D<sub>i<\/sub><\/label><input class=\"vc-input\" id=\"vc-id\" type=\"text\" inputmode=\"decimal\" placeholder=\"e.g. 100\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-od\">Gasket outer diameter, D<sub>o<\/sub><\/label><input class=\"vc-input\" id=\"vc-od\" type=\"text\" inputmode=\"decimal\" placeholder=\"e.g. 150\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-t\">Uncompressed nominal thickness, t<\/label><input class=\"vc-input\" id=\"vc-t\" type=\"text\" inputmode=\"decimal\" placeholder=\"e.g. 3\"><\/div>\r\n<div class=\"vc-field vc-field-source\"><label class=\"vc-label\" for=\"vc-source\">Dimension source and revision <span class=\"vc-label-hint\">(required)<\/span><\/label><input class=\"vc-input\" id=\"vc-source\" type=\"text\" maxlength=\"500\" placeholder=\"e.g. manufacturer drawing G-42 rev C\"><\/div>\r\n<\/div><p id=\"vc-error\" role=\"alert\" style=\"margin:.75rem 0 0;color:#b42318\"><\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Scope:<\/strong> ideal concentric circular boundaries and constant uncompressed thickness. This page does not determine a compatible gasket,standard designation,pressure\/temperature rating,chemical suitability,compression,creep,leak tightness,seating stress,bolt load,preload or torque.<\/p><\/div><\/form>\r\n<div class=\"vc-results\" id=\"vc-results\" aria-live=\"polite\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Nominal geometric results<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\">\r\n<div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Gross annular plan area<\/div><div class=\"vc-rcard-value\" id=\"vc-r-area\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Radial annulus width, b<\/div><div class=\"vc-rcard-value\" id=\"vc-r-width\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Mean diameter, G<\/div><div class=\"vc-rcard-value\" id=\"vc-r-mean\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Inner circumference<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ci\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Outer circumference<\/div><div class=\"vc-rcard-value\" id=\"vc-r-co\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Mean circumference<\/div><div class=\"vc-rcard-value\" id=\"vc-r-cm\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Radial-section rectangle, b\u00b7t<\/div><div class=\"vc-rcard-value\" id=\"vc-r-section\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Ideal solid-envelope volume, A\u00b7t<\/div><div class=\"vc-rcard-value\" id=\"vc-r-volume\">\u2014<\/div><\/div>\r\n<\/div><p class=\"vc-result-note\" id=\"vc-r-note\"><\/p><\/div><\/div>\r\n\r\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd0<\/span><span class=\"vc-section-title\">Formulas,meaning and standards context<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\r\n<h3>Ideal annulus formulas<\/h3><p>For documented inner diameter D<sub>i<\/sub>,outer diameter D<sub>o<\/sub> and uncompressed nominal thickness t,the radial width is b=(D<sub>o<\/sub>\u2212D<sub>i<\/sub>)\/2 and mean diameter is G=(D<sub>o<\/sub>+D<sub>i<\/sub>)\/2. Subtracting the two circle areas gives the gross nominal plan area:<\/p>\r\n<div class=\"vc-formula-box\">A = \u03c0(D<sub>o<\/sub>\u00b2\u2212D<sub>i<\/sub>\u00b2)\/4 = \u03c0\u00b7G\u00b7b<\/div>\r\n<p>Inner,outer and mean circumferences are \u03c0D<sub>i<\/sub>,\u03c0D<sub>o<\/sub> and \u03c0G. The ideal rectangular radial section is b\u00b7t and the solid annular-envelope volume is A\u00b7t. For a spiral-wound,serrated,porous,composite or otherwise non-solid gasket,this envelope volume is not the actual constituent material volume or mass.<\/p>\r\n<h3>Not an effective seating area<\/h3><p>A is only the area of the nominal planar annulus. It is not automatically the effective gasket reaction area and must not be multiplied by an assumed y value to claim seating load. Compression behaviour,flange facing,standard-specific effective width,service conditions,qualified gasket parameters and the full joint method determine design quantities.<\/p>\r\n<h3>Standards context \u2014 tables are not implemented<\/h3><p><a href=\"https:\/\/www.asme.org\/getmedia\/eb102b24-8593-4273-9d9f-049845df92e8\/B16-20_2023_ToC.pdf\" target=\"_blank\" rel=\"noopener\">ASME B16.20\u20142023<\/a> is the current metallic-gasket edition identified by ASME and covers standardized metallic gasket constructions within its scope. <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-21-nonmetallic-flat-gaskets-pipe-flanges\" target=\"_blank\" rel=\"noopener\">ASME B16.21\u20142021<\/a> covers types,sizes,materials,dimensions,tolerances and markings for nonmetallic flat gaskets suitable for referenced flange standards. Their licensed dimensional tables are not reproduced or inferred here.<\/p>\r\n<p><a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-5-pipe-flanges-flanged-fittings-nps-1-2-nps-24-metric-inch-standard\/2025\" target=\"_blank\" rel=\"noopener\">ASME B16.5\u20142025<\/a> covers ratings,materials,dimensions,tolerances,marking and testing for its specified flanges;flange bolting data must not be silently treated as a B16.20 gasket table. <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/pressure-boundary-bolted-flange-joint-assembly\" target=\"_blank\" rel=\"noopener\">ASME PCC-1\u20142022<\/a> provides pressure-boundary bolted-joint assembly guidance within its scope;this elementary geometry is not a PCC-1 load calculation.<\/p>\r\n<p>All selected-unit dimensions remain in that unit. NIST defines1in exactly as25.4mm,so area scales by25.4\u00b2 and volume by25.4\u00b3 between equivalent inch\/mm inputs. Sources checked12July2026. No closed clause,table,standard size,m\/y factor or material limit is asserted.<\/p>\r\n<div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Selection warning:<\/strong> verify flange standard\/edition,NPS,class,facing,gasket construction,dimensions,tolerances,materials,marking,manufacturer data,fluid,temperature,pressure and applicable law. A geometric match alone does not establish suitability.<\/p><\/div>\r\n<\/div><\/div><\/div>\r\n<footer class=\"vc-footer\"><p>\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Reference annulus geometry only;not a gasket selector,standard lookup or pressure-joint design. Scientific review:July2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';function $(i){return document.getElementById(i)}var outs=['vc-r-area','vc-r-width','vc-r-mean','vc-r-ci','vc-r-co','vc-r-cm','vc-r-section','vc-r-volume'];function pnum(s){s=s.trim().replace(',','.');return \/^[+]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:[eE][+-]?\\d+)?$\/.test(s)?Number(s):NaN}function fmt(x){return Number(x.toPrecision(12)).toString()}function clear(){outs.forEach(function(id){$(id).textContent='\u2014'});$('vc-r-note').textContent='';$('vc-results').classList.remove('vc-visible')}function calc(){var ids=['vc-unit','vc-id','vc-od','vc-t','vc-source'],raw=ids.map(function(id){return $(id).value.trim()}),any=raw.some(Boolean),u=new URL(location),keys=['unit','inner_diameter','outer_diameter','thickness','source'];keys.forEach(function(k,i){if(raw[i])u.searchParams.set(k,raw[i]);else u.searchParams.delete(k)});history.replaceState(null,'',u.toString());if(!raw.every(Boolean)){clear();$('vc-error').textContent=any?'Complete all five fields.':'';return}var di=pnum(raw[1]),dO=pnum(raw[2]),t=pnum(raw[3]);if(!Number.isFinite(di)||di<=0||di>1e9){clear();$('vc-error').textContent='Inner diameter must be a strict,finite number greater than0 and no more than10\u2079 selected units.';return}if(!Number.isFinite(dO)||dO<=di||dO>1e9){clear();$('vc-error').textContent='Outer diameter must be a strict,finite number greater than the inner diameter and no more than10\u2079 selected units.';return}if(!Number.isFinite(t)||t<=0||t>1e9){clear();$('vc-error').textContent='Thickness must be a strict,finite number greater than0 and no more than10\u2079 selected units.';return}var b=(dO-di)\/2,G=(dO+di)\/2,area=Math.PI\/4*(dO-di)*(dO+di),ci=Math.PI*di,co=Math.PI*dO,cm=Math.PI*G,section=b*t,volume=area*t;if(![b,G,area,ci,co,cm,section,volume].every(Number.isFinite)){clear();$('vc-error').textContent='The result exceeds the finite numerical range.';return}var L=raw[0],A=L+'\u00b2',V=L+'\u00b3';$('vc-error').textContent='';$('vc-r-area').textContent=fmt(area)+' '+A;$('vc-r-width').textContent=fmt(b)+' '+L;$('vc-r-mean').textContent=fmt(G)+' '+L;$('vc-r-ci').textContent=fmt(ci)+' '+L;$('vc-r-co').textContent=fmt(co)+' '+L;$('vc-r-cm').textContent=fmt(cm)+' '+L;$('vc-r-section').textContent=fmt(section)+' '+A;$('vc-r-volume').textContent=fmt(volume)+' '+V;$('vc-r-note').textContent='Dimension source:'+raw[4]+' | Gross geometric area and ideal solid-envelope volume only;no effective seating area,load,stress,torque or suitability verdict.';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);$('vc-copy-btn').addEventListener('click',function(){if(navigator.clipboard)navigator.clipboard.writeText($('vc-results').innerText)});document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});var p=new URLSearchParams(location.search),keys=['unit','inner_diameter','outer_diameter','thickness','source'],ids=['vc-unit','vc-id','vc-od','vc-t','vc-source'];keys.forEach(function(k,i){if(p.has(k))$(ids[i]).value=p.get(k)});calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Calculate nominal annulus width,mean diameter,gross plan area,circumferences and ideal solid-envelope volume from documented gasket ID,OD and thickness. No standards lookup or bolt load.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100096","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/calculator\/100096","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":4,"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/calculator\/100096\/revisions"}],"predecessor-version":[{"id":102402,"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/calculator\/100096\/revisions\/102402"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/media?parent=100096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/categories?post=100096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bg\/wp-json\/wp\/v2\/tags?post=100096"}],"curies":[{"name":"\u0440\u0430\u0431\u043e\u0442\u043d\u0430 \u0441\u0440\u0435\u0449\u0430","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}