{"id":100252,"date":"2026-02-15T20:29:46","date_gmt":"2026-02-15T20:29:46","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100252"},"modified":"2026-07-15T18:16:47","modified_gmt":"2026-07-15T18:16:47","slug":"surface-roughness-converter","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/id\/calculators\/surface-roughness-converter\/","title":{"rendered":"Controlled Surface-Parameter Unit Converter"},"content":{"rendered":"<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Controlled Surface-Parameter Unit Converter\",\"description\":\"Convert an already determined surface-height parameter value between length units without inferring another parameter, roughness grade, process or conformity.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/surface-roughness-converter\/\",\"applicationCategory\":\"EngineeringApplication\",\"operatingSystem\":\"Any\",\"isAccessibleForFree\":true,\"dateModified\":\"2026-07-15\",\"publisher\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"}}<\/script><\/p>\n<style>\n#sr-tool{--sr-ink:#17212b;--sr-muted:#53616f;--sr-line:#cbd5df;--sr-soft:#f3f7fa;--sr-blue:#075985;--sr-blue2:#e0f2fe;--sr-red:#991b1b;--sr-red2:#fef2f2;--sr-green:#166534;max-width:1120px;margin:24px auto;font-family:Inter,system-ui,-apple-system,\"Segoe UI\",sans-serif;color:var(--sr-ink);line-height:1.55}#sr-tool *{box-sizing:border-box}#sr-tool h1,#sr-tool h2,#sr-tool h3{line-height:1.2;color:var(--sr-ink)}#sr-tool h1{font-size:clamp(1.65rem,4vw,2.35rem);margin:0 0 12px}#sr-tool h2{font-size:1.28rem;margin:0 0 16px}#sr-tool h3{font-size:1rem;margin:0 0 8px}#sr-tool p{margin:0 0 12px}#sr-tool 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class=\"sr-kicker\">Controlled dimensional conversion<\/div>\n<h1>Surface-Parameter Unit Converter<\/h1>\n<p class=\"sr-lead\">Convert an <strong>already determined or specified height-parameter value<\/strong> between length units while preserving its parameter identifier. This worksheet does not manufacture Rz, a grade number or a process recommendation from Ra.<\/p>\n<div class=\"sr-badges\"><span class=\"sr-badge\">Exact length-unit factors<\/span><span class=\"sr-badge\">No Ra \u2194 Rz inference<\/span><span class=\"sr-badge\">No grade\/process lookup<\/span><\/div>\n<\/header>\n<div class=\"sr-alert\"><strong>Decision boundary.<\/strong> A unit conversion preserves one physical length; it does not convert one surface parameter into another. Parameter evaluation, filters, nesting indices, section lengths, measurement uncertainty and conformity remain governed by the referenced measurement or specification record.<\/div>\n<form id=\"sr-form\" novalidate>\n<section class=\"sr-card\" aria-labelledby=\"sr-value-heading\">\n<h2 id=\"sr-value-heading\">1. Recorded value<\/h2>\n<div class=\"sr-grid\">\n<div class=\"sr-field\"><label for=\"sr-symbol\">Parameter identifier <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-symbol\" type=\"text\" maxlength=\"32\" autocomplete=\"off\" placeholder=\"For example: Ra\"><\/p>\n<div class=\"sr-help\">Copy the identifier exactly from the controlled record. It is a label only; this page does not interpret its operator.<\/div>\n<\/div>\n<div class=\"sr-field\"><label for=\"sr-value\">Non-negative value <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-value\" type=\"text\" inputmode=\"decimal\" maxlength=\"40\" autocomplete=\"off\" placeholder=\"For example: 1.6\"><\/p>\n<div class=\"sr-help\">One plain decimal with point or comma. Scientific notation, grouping and unit suffixes are rejected.<\/div>\n<\/div>\n<div class=\"sr-field\"><label for=\"sr-unit\">Original unit <span class=\"sr-required\">*<\/span><\/label><select class=\"sr-select\" id=\"sr-unit\"><option value=\"\">Select<\/option><option value=\"nm\">nm<\/option><option value=\"um\">\u00b5m<\/option><option value=\"mm\">mm<\/option><option value=\"uin\">\u00b5in<\/option><option value=\"in\">in<\/option><\/select><\/div>\n<div class=\"sr-field\"><label for=\"sr-kind\">Record type <span class=\"sr-required\">*<\/span><\/label><select class=\"sr-select\" id=\"sr-kind\"><option value=\"\">Select<\/option><option value=\"measurement\">Measured\/evaluated parameter result<\/option><option value=\"specification\">Drawing or specification requirement<\/option><option value=\"reference\">Controlled reference value<\/option><\/select><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"sr-card\" aria-labelledby=\"sr-record-heading\">\n<h2 id=\"sr-record-heading\">2. Provenance record<\/h2>\n<div class=\"sr-grid\">\n<div class=\"sr-field\"><label for=\"sr-record\">Record \/ requirement ID <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-record\" type=\"text\" maxlength=\"160\" autocomplete=\"off\"><\/div>\n<div class=\"sr-field\"><label for=\"sr-source\">Source and revision <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-source\" type=\"text\" maxlength=\"400\" autocomplete=\"off\"><\/div>\n<div class=\"sr-field\"><label for=\"sr-definition\">Parameter definition\/operator source, edition and location <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-definition\" type=\"text\" maxlength=\"500\" autocomplete=\"off\"><\/div>\n<div class=\"sr-field\"><label for=\"sr-method\">Measurement or specification method record <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-method\" type=\"text\" maxlength=\"500\" autocomplete=\"off\"><\/div>\n<div class=\"sr-field\"><label for=\"sr-precision\">Original precision \/ rounding statement <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-precision\" type=\"text\" maxlength=\"300\" autocomplete=\"off\"><\/div>\n<div class=\"sr-field\"><label for=\"sr-analyst\">Analyst \/ checker <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-analyst\" type=\"text\" maxlength=\"160\" autocomplete=\"off\"><\/div>\n<div class=\"sr-field\"><label for=\"sr-date\">Record date <span class=\"sr-required\">*<\/span><\/label><input class=\"sr-input\" id=\"sr-date\" type=\"date\"><\/div>\n<\/p><\/div>\n<div class=\"sr-field\" style=\"margin-top:16px\"><label for=\"sr-notes\">Notes<\/label><textarea class=\"sr-textarea\" id=\"sr-notes\" maxlength=\"1200\" placeholder=\"Optional uncertainty, acceptance-rule or follow-up notes. No data is stored.\"><\/textarea><\/div>\n<\/section>\n<section class=\"sr-card\" aria-labelledby=\"sr-confirm-heading\">\n<h2 id=\"sr-confirm-heading\">3. Confirmations<\/h2>\n<div class=\"sr-checks\">\n        <label class=\"sr-check\" for=\"sr-c1\"><input id=\"sr-c1\" type=\"checkbox\"><span>I copied the value, unit and parameter identifier from the same controlled record.<\/span><\/label><br \/>\n        <label class=\"sr-check\" for=\"sr-c2\"><input id=\"sr-c2\" type=\"checkbox\"><span>I understand that the output changes units only and does not infer Ra, Rq, Rz, Rt, an N grade, a manufacturing process or surface function.<\/span><\/label><br \/>\n        <label class=\"sr-check\" for=\"sr-c3\"><input id=\"sr-c3\" type=\"checkbox\"><span>I will use the original record\u2014not this unit conversion\u2014to decide measurement validity, uncertainty or conformity.<\/span><\/label>\n      <\/div>\n<div class=\"sr-actions\"><button class=\"sr-btn sr-primary\" type=\"submit\">Convert documented value<\/button><button class=\"sr-btn sr-secondary\" id=\"sr-reset\" type=\"button\">Clear worksheet<\/button><\/div>\n<div class=\"sr-status\" id=\"sr-status\" role=\"alert\" aria-live=\"polite\"><\/div>\n<\/section><\/form>\n<section class=\"sr-card sr-output\" id=\"sr-output\" data-visible=\"false\" aria-labelledby=\"sr-output-heading\">\n<h2 id=\"sr-output-heading\">4. Unit-conversion result<\/h2>\n<div class=\"sr-result-grid\">\n<div class=\"sr-result\"><span>Parameter preserved<\/span><output id=\"sr-r-symbol\">\u2014<\/output><\/div>\n<div class=\"sr-result\"><span>Nanometres<\/span><output id=\"sr-r-nm\">\u2014<\/output><\/div>\n<div class=\"sr-result\"><span>Micrometres<\/span><output id=\"sr-r-um\">\u2014<\/output><\/div>\n<div class=\"sr-result\"><span>Millimetres<\/span><output id=\"sr-r-mm\">\u2014<\/output><\/div>\n<div class=\"sr-result\"><span>Microinches<\/span><output id=\"sr-r-uin\">\u2014<\/output><\/div>\n<div class=\"sr-result\"><span>Inches<\/span><output id=\"sr-r-in\">\u2014<\/output><\/div>\n<\/p><\/div>\n<p class=\"sr-note\" id=\"sr-r-boundary\">\n<\/section>\n<section class=\"sr-card\" aria-labelledby=\"sr-method-heading\">\n<h2 id=\"sr-method-heading\">Method and applicability<\/h2>\n<div class=\"sr-formula\">Let L be the recorded physical length in \u00b5m.<br \/>L = input \u00d7 unit factor<br \/>1 nm = 0.001 \u00b5m &nbsp; | &nbsp; 1 mm = 1,000 \u00b5m<br \/>1 \u00b5in = 0.0254 \u00b5m exactly &nbsp; | &nbsp; 1 in = 25,400 \u00b5m exactly<\/div>\n<div class=\"sr-boundary\">\n<div>\n<h3>What is calculated<\/h3>\n<ul>\n<li>Dimensional normalization to \u00b5m.<\/li>\n<li>Equivalent nm, mm, \u00b5in and inch values.<\/li>\n<li>The parameter label is preserved unchanged.<\/li>\n<\/ul>\n<\/div>\n<div>\n<h3>What is not calculated<\/h3>\n<ul>\n<li>Any different surface parameter.<\/li>\n<li>Historical N1\u2013N12 grades or process capability.<\/li>\n<li>Filters, uncertainty or conformance.<\/li>\n<\/ul>\n<\/div>\n<div>\n<h3>Input requirements<\/h3>\n<ul>\n<li>One non-negative height value.<\/li>\n<li>One explicit original unit.<\/li>\n<li>A controlled source and operator record.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"sr-info\"><strong>Why Ra cannot be converted to Rz.<\/strong> The centered profiles [\u22121, +1] and [\u22122, 0, 0, +2] have the same mean absolute deviation, 1. Their ranges are 2 and 4. One average-height value therefore cannot uniquely determine an extreme-height parameter. Multiplying every Ra by four is an estimate, not a dimensional conversion or ISO parameter evaluation.<\/div>\n<\/section>\n<section class=\"sr-card\" aria-labelledby=\"sr-source-heading\">\n<h2 id=\"sr-source-heading\">Sources and standards boundary<\/h2>\n<ul class=\"sr-source-list\">\n<li><a href=\"https:\/\/www.iso.org\/standard\/72196.html\" rel=\"noopener\" target=\"_blank\">ISO 21920-1:2021<\/a>, edition 1, published 2021-12: rules for indicating profile-method surface texture in technical product documentation. As of 2026-07-15 it is at stage 90.92 (to be revised); the published edition remains ISO 21920-1:2021.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/28089.html\" rel=\"noopener\" target=\"_blank\">ISO 1302:2002<\/a>, edition 4, was withdrawn on 2021-12-20 and revised by ISO 21920-1:2021. Its official scope concerns indication by graphical symbols and text; it is not authority for a universal Ra-to-Rz multiplier.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/10132.html\" rel=\"noopener\" target=\"_blank\">ISO 4287:1997<\/a>, including its corrigenda\/amendment lifecycle, was withdrawn on 2021-12-20 and revised by ISO 21920-2:2021.<\/li>\n<li><a href=\"https:\/\/www.ptb.de\/cms\/en\/ptb\/fachabteilungen\/abt5\/fb-51\/standards-and-guidelines-for-surface-metrology.html\" rel=\"noopener\" target=\"_blank\">PTB surface-metrology standards overview<\/a> confirms that ISO 21920-1 replaces ISO 1302, ISO 21920-2 replaces the parameter-definition standards, and ISO 21920-3 supplies specification operators.<\/li>\n<li><a href=\"https:\/\/www.nist.gov\/pml\/special-publication-811\/nist-guide-si-appendix-b-conversion-factors\/nist-guide-si-appendix-b8\" rel=\"noopener\" target=\"_blank\">NIST Special Publication 811, Appendix B.8<\/a>: 1 microinch = 2.54 \u00d7 10<sup>\u22122<\/sup> \u00b5m; the factor is marked exact. SI prefixes give the nm\/\u00b5m\/mm factors.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/4496.html\" rel=\"noopener\" target=\"_blank\">ISO 468:1982<\/a>, \u201cSurface roughness \u2014 Parameters, their values and general rules for specifying requirements,\u201d was withdrawn on 1998-04-10. The removed N1\u2013N12\/Rz\/process table cannot be presented as current ISO 1302 data; its exact provenance and any contractual legacy use are <strong>NEEDS_LICENSED_SOURCE<\/strong>.<\/li>\n<\/ul>\n<p><strong>Classification:<\/strong> this is an exact general length-unit conversion, not an \u201cISO formula calculator.\u201d Exact ISO parameter definitions, operator tables, legacy grade-number clauses and process-capability ranges are not reproduced or guessed.<\/p>\n<\/section>\n<p><\/main><\/p>\n<p><script>\n(function(){\n  'use strict';\n  var factorUm=Object.freeze({nm:0.001,um:1,mm:1000,uin:0.0254,in:25400});\n  var labels=Object.freeze({nm:'nm',um:'\u00b5m',mm:'mm',uin:'\u00b5in',in:'in'});\n  var required=['sr-record','sr-source','sr-definition','sr-method','sr-precision','sr-analyst','sr-date'];\n  function byId(id){return document.getElementById(id);}\n  function parsePlain(raw){var t=String(raw).trim();if(t.length<1||t.length>40||!\/^(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)$\/.test(t))throw new Error('format');var n=Number(t.replace(',','.'));if(!Number.isFinite(n))throw new Error('format');return Object.is(n,-0)?0:n;}\n  function convert(value,unit){if(!Object.prototype.hasOwnProperty.call(factorUm,unit))throw new Error('unit');if(!Number.isFinite(value)||value<0)throw new Error('value');var um=value*factorUm[unit];if(!Number.isFinite(um)||um>1e12)throw new Error('range');return Object.freeze({nm:um*1000,um:um,mm:um\/1000,uin:um\/0.0254,in:um\/25400});}\n  function fmt(n){if(Object.is(n,-0))n=0;if(!Number.isFinite(n))return'\u2014';var a=Math.abs(n);if(a!==0&&(a>=1e12||a<1e-9))return n.toExponential(11).replace(\/\\.?0+e\/,'e');return new Intl.NumberFormat('en-US',{maximumSignificantDigits:12,useGrouping:false}).format(n);}\n  function clearResults(){byId('sr-output').dataset.visible='false';['symbol','nm','um','mm','uin','in'].forEach(function(x){byId('sr-r-'+x).textContent='\u2014';});byId('sr-r-boundary').textContent='';}\n  function fail(message,field){clearResults();var s=byId('sr-status');s.dataset.kind='error';s.textContent=message;if(field)field.focus();}\n  function validSymbol(raw){var t=String(raw).trim();return t.length>=1&&t.length<=32&&\/^[A-Za-z][A-Za-z0-9*+_\\\/(). -]*$\/.test(t);}\n  byId('sr-form').addEventListener('submit',function(ev){ev.preventDefault();var symbol=byId('sr-symbol').value.trim();if(!validSymbol(symbol)){fail('Enter the 1\u201332 character parameter identifier from the controlled record.',byId('sr-symbol'));return;}var value;try{value=parsePlain(byId('sr-value').value);}catch(e){fail('Enter one non-negative plain decimal; scientific notation, grouping and unit suffixes are not accepted.',byId('sr-value'));return;}var unit=byId('sr-unit').value,result;try{result=convert(value,unit);}catch(e){var message=e.message==='unit'?'Select the original unit.':e.message==='range'?'The normalized value must not exceed 1e12 \u00b5m.':'Enter a valid non-negative value.';fail(message,e.message==='unit'?byId('sr-unit'):byId('sr-value'));return;}if(!\/^(measurement|specification|reference)$\/.test(byId('sr-kind').value)){fail('Select the controlled record type.',byId('sr-kind'));return;}for(var i=0;i<required.length;i++){var f=byId(required[i]);if(!f.value.trim()){fail('Complete every required provenance field.',f);return;}}for(var c=1;c<=3;c++)if(!byId('sr-c'+c).checked){fail('Complete all three scope and decision-boundary confirmations.',byId('sr-c'+c));return;}byId('sr-r-symbol').textContent=symbol+' (unchanged)';Object.keys(labels).forEach(function(key){byId('sr-r-'+key).textContent=fmt(result[key])+' '+labels[key];});byId('sr-r-boundary').textContent='Equivalent length-unit representations of the same recorded '+symbol+' value. No surface parameter, grade, process, uncertainty or conformity result was inferred.';byId('sr-output').dataset.visible='true';var s=byId('sr-status');s.dataset.kind='ok';s.textContent='Documented value converted without changing its parameter identity.';byId('sr-output').scrollIntoView({behavior:'smooth',block:'start'});\n  });\n  byId('sr-reset').addEventListener('click',function(){byId('sr-form').reset();clearResults();var s=byId('sr-status');s.textContent='';s.dataset.kind='';byId('sr-symbol').focus();});\n  window.C100252Test=Object.freeze({parsePlain:parsePlain,convert:convert,factorUm:factorUm});clearResults();\n})();\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convert an already determined surface-height parameter value between units without inferring Rz, roughness grades, processes or ISO conformance.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100252","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/calculator\/100252","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/calculator\/100252\/revisions"}],"predecessor-version":[{"id":102596,"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/calculator\/100252\/revisions\/102596"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/media?parent=100252"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/categories?post=100252"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/id\/wp-json\/wp\/v2\/tags?post=100252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}