{"id":1533,"date":"2026-07-11T06:38:19","date_gmt":"2026-07-11T06:38:19","guid":{"rendered":"https:\/\/wetflagcalculator.com\/?p=1533"},"modified":"2026-07-18T12:12:55","modified_gmt":"2026-07-18T12:12:55","slug":"iu-to-mcg-converter","status":"publish","type":"post","link":"https:\/\/wetflagcalculator.com\/es\/iu-to-mcg-converter\/","title":{"rendered":"Calculadora convertidora de IU a mcg"},"content":{"rendered":"\n<h2 style=\"text-align:center;font-family:'DM Sans',sans-serif;margin-bottom:20px;\">\nIU to mcg Converter\n<\/h2>\n\n<style>\n#iucm*{box-sizing:border-box;margin:0;padding:0}\n#iucm{\n  font-family:'DM Sans',system-ui,sans-serif;\n  max-width:480px;\n  margin:0 auto;\n  border:1.5px solid #e6e2db;\n  border-radius:18px;\n  padding:26px 24px 22px;\n  background:#fff;\n}\n#iucm .lbl{\n  display:block;\n  font-size:11px;\n  font-weight:700;\n  text-transform:uppercase;\n  letter-spacing:.07em;\n  color:#999;\n  margin-bottom:5px;\n}\n#iucm select,#iucm input[type=number]{\n  width:100%;\n  height:46px;\n  padding:0 14px;\n  border:1.5px solid #e6e2db;\n  border-radius:10px;\n  font-size:15px;\n  background:#fafaf8;\n}\n#iucm select:disabled,#iucm input:disabled{\n  opacity:.5;\n  cursor:not-allowed;\n}\n#iucm .row{\n  display:grid;\n  grid-template-columns:1fr 1fr;\n  gap:12px;\n  margin-bottom:12px;\n}\n#iucm .full{grid-column:1\/-1}\n#iucm .arrow{\n  display:flex;\n  align-items:center;\n  justify-content:center;\n  padding-top:22px;\n  font-size:22px;\n  color:#ccc;\n}\n#iucm button.convert-btn{\n  width:100%;\n  height:48px;\n  margin-top:6px;\n  background:#111;\n  color:#fff;\n  border:none;\n  border-radius:11px;\n  font-size:15px;\n  font-weight:700;\n  cursor:pointer;\n}\n#iucm button.convert-btn:disabled{\n  background:#ccc;\n  cursor:not-allowed;\n}\n#iucm-result{\n  display:none;\n  margin-top:18px;\n  padding-top:18px;\n  border-top:1.5px solid #f0ede8;\n}\n#iucm-result .big{\n  font-size:36px;\n  font-weight:700;\n}\n#iucm-result .eq{\n  font-size:13px;\n  color:#888;\n  margin-top:5px;\n}\n#iucm-note{\n  display:none;\n  margin-top:18px;\n  padding:14px 16px;\n  border-top:1.5px solid #f0ede8;\n  font-size:13px;\n  line-height:1.6;\n  color:#555;\n  background:#fafaf8;\n  border-radius:10px;\n}\n#iucm-share{\n  display:none;\n  margin-top:10px;\n  font-size:12px;\n  color:#999;\n  word-break:break-all;\n}\n.chart-wrap{\n  max-width:700px;\n  margin:30px auto;\n  font-family:'DM Sans',sans-serif;\n}\n.chart-wrap p.chart-title{\n  font-size:15px;\n  font-weight:400;\n  margin-bottom:10px;\n  color:#333;\n}\n.chart-wrap table{\n  width:100%;\n  border-collapse:collapse;\n}\n.chart-wrap th,\n.chart-wrap td{\n  border:1px solid #ddd;\n  padding:10px;\n  text-align:left;\n}\n.chart-wrap th{\n  background:#f7f7f7;\n}\n.similar-wrap{\n  max-width:700px;\n  margin:30px auto;\n  font-family:'DM Sans',sans-serif;\n}\n.similar-wrap h3{\n  margin-bottom:12px;\n}\n.similar-group{\n  margin-bottom:18px;\n}\n.similar-group .grp-title{\n  font-size:12px;\n  font-weight:700;\n  text-transform:uppercase;\n  letter-spacing:.06em;\n  color:#999;\n  margin-bottom:8px;\n}\n.similar-links{\n  display:flex;\n  flex-wrap:wrap;\n  gap:8px;\n}\n.similar-links a{\n  display:inline-block;\n  padding:8px 14px;\n  border:1.5px solid #e6e2db;\n  border-radius:20px;\n  font-size:13px;\n  color:#111;\n  text-decoration:none;\n  background:#fafaf8;\n}\n.similar-links a:hover{\n  background:#111;\n  color:#fff;\n  border-color:#111;\n}\n.similar-links a.active{\n  background:#111;\n  color:#fff;\n  border-color:#111;\n}\n<\/style>\n\n<div id=\"iucm\">\n\n<div class=\"row\">\n<div class=\"full\">\n<label class=\"lbl\">Substance<\/label>\n<select id=\"iucm-sub\" onchange=\"iucmOnSubChange()\">\n<option value=\"vitD\" selected data-name=\"Vitamin D\">Vitamin D (D2 \/ D3)<\/option>\n<option value=\"vitA_retinol\" data-name=\"Vitamin A (retinol)\">Vitamin A \u2014 retinol<\/option>\n<option value=\"vitA_beta\" data-name=\"Vitamin A (beta-carotene)\">Vitamin A \u2014 beta-carotene<\/option>\n<option value=\"vitE_nat\" data-name=\"Vitamin E natural\">Vitamin E \u2014 natural<\/option>\n<option value=\"vitE_syn\" data-name=\"Vitamin E synthetic\">Vitamin E \u2014 synthetic<\/option>\n<option value=\"vitC\" data-name=\"Vitamin C\">Vitamin C<\/option>\n<option value=\"vitB12\" data-name=\"Vitamin B12\">Vitamin B12<\/option>\n<option value=\"vitK2\" data-name=\"Vitamin K2\">Vitamin K2<\/option>\n<\/select>\n<\/div>\n<\/div>\n\n<div class=\"row\">\n<div class=\"full\">\n<label class=\"lbl\">Direction<\/label>\n<select id=\"iucm-dir\" onchange=\"iucmOnDirChange()\">\n<option value=\"iu2mcg\" selected>IU \u2192 mcg<\/option>\n<option value=\"mcg2iu\">mcg \u2192 IU<\/option>\n<\/select>\n<\/div>\n<\/div>\n\n<div class=\"row\">\n<div>\n<label class=\"lbl\" id=\"iucm-qty-lbl\">Quantity (IU)<\/label>\n<input type=\"number\" id=\"iucm-qty\" value=\"1000\">\n<\/div>\n\n<div>\n<label class=\"lbl\">From<\/label>\n<select id=\"iucm-from\" disabled>\n<option selected>IU<\/option>\n<\/select>\n<\/div>\n<\/div>\n\n<div class=\"row\">\n<div class=\"arrow\" style=\"cursor:pointer;\" id=\"iucm-swap\" onclick=\"iucmSwap()\" title=\"Swap direction\">\u21c5<\/div>\n\n<div>\n<label class=\"lbl\">To<\/label>\n<select id=\"iucm-to\" disabled>\n<option selected>mcg<\/option>\n<\/select>\n<\/div>\n<\/div>\n\n<button class=\"convert-btn\" id=\"iucm-btn\" onclick=\"iucmCalc(true)\">Convert<\/button>\n\n<div id=\"iucm-result\">\n<div class=\"big\" id=\"iucm-out\"><\/div>\n<div class=\"eq\" id=\"iucm-eq\"><\/div>\n<\/div>\n\n<div id=\"iucm-note\"><\/div>\n\n<div id=\"iucm-share\"><\/div>\n\n<\/div>\n\n<div class=\"chart-wrap\">\n\n<p class=\"chart-title\">IU to mcg Conversion Chart (per 10 IU)<\/p>\n\n<table>\n<tbody><tr>\n<th>Vitamin<\/th>\n<th>10 IU in mcg<\/th>\n<\/tr>\n\n<tr>\n<td>Vitamin D (D2 \/ D3)<\/td>\n<td>0.25 mcg<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin A (Retinol)<\/td>\n<td>3 mcg<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin A (Beta-Carotene)<\/td>\n<td>6 mcg<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin E Natural<\/td>\n<td>6.71 mcg<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin E Synthetic<\/td>\n<td>9.09 mcg<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin C<\/td>\n<td>500 mcg<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin B12<\/td>\n<td>No official IU \u2014 labeled in mcg only<\/td>\n<\/tr>\n\n<tr>\n<td>Vitamin K2<\/td>\n<td>No official IU \u2014 labeled in mcg only<\/td>\n<\/tr>\n\n<\/tbody><\/table>\n\n<\/div>\n\n<div class=\"similar-wrap\" id=\"iucm-similar\">\n<h3>Popular IU to mcg Conversions<\/h3>\n<div class=\"similar-group\">\n<div class=\"grp-title\">Vitamin D<\/div>\n<div class=\"similar-links\" id=\"iucm-sim-vitd\"><\/div>\n<\/div>\n<\/div>\n\n<script>\n(function(){\n\n\/\/ mcg per 1 IU, for each substance. null = no standardized IU exists.\nvar F={\nvitD:0.025,\nvitA_retinol:0.3,\nvitA_beta:0.6,\nvitE_nat:0.671,\nvitE_syn:0.909,\nvitC:50,\nvitB12:null,\nvitK2:null\n};\n\n\/\/ slug fragment used inside the shareable URL for each substance\n\/\/ vitD has NO fragment, so its URL stays exactly \"1000-iu-to-mcg\" \/ \"25-mcg-to-iu\"\nvar SLUG={\nvitD:\"\",\nvitA_retinol:\"vitamin-a-retinol\",\nvitA_beta:\"vitamin-a-beta-carotene\",\nvitE_nat:\"vitamin-e-natural\",\nvitE_syn:\"vitamin-e-synthetic\",\nvitC:\"vitamin-c\",\nvitB12:\"vitamin-b12\",\nvitK2:\"vitamin-k2\"\n};\n\nvar NAME={\nvitD:\"Vitamin D\",\nvitA_retinol:\"Vitamin A (retinol)\",\nvitA_beta:\"Vitamin A (beta-carotene)\",\nvitE_nat:\"Vitamin E (natural)\",\nvitE_syn:\"Vitamin E (synthetic)\",\nvitC:\"Vitamin C\",\nvitB12:\"Vitamin B12\",\nvitK2:\"Vitamin K2\"\n};\n\nvar NO_IU_NOTE=\"There's no official International Unit (IU) conversion for {NAME}. Unlike Vitamin D, A, and E, {NAME} was never assigned a standardized IU by the USP\/FDA \u2014 it's measured and labeled only in mcg (micrograms). Any \\\"IU\\\" figure you see for {NAME} elsewhere is an unofficial estimate, not a regulated conversion, so we don't calculate one here.\";\n\n\/\/ all quantities supplied, merged from both lists, de-duplicated, ascending\nvar POPULAR_VITD=[1,2,5,10,15,30,45,50,90,100,125,150,200,250,300,400,500,600,700,800,900,1000,1200,2000,2500,3000,4000,5000,8000,10000,20000,25000,50000,60000,100000,250000];\n\nfunction fmt(n){\nreturn parseFloat(n.toPrecision(10)).toString();\n}\n\n\/\/ dir: \"iu2mcg\" (IU -> mcg) or \"mcg2iu\" (mcg -> IU)\nfunction slugFor(qty,key,dir){\nvar s=SLUG[key];\nif(dir===\"mcg2iu\"){\nreturn s ? (qty+\"-mcg-\"+s+\"-to-iu\") : (qty+\"-mcg-to-iu\");\n}\nreturn s ? (qty+\"-iu-\"+s+\"-to-mcg\") : (qty+\"-iu-to-mcg\");\n}\n\n\/\/ parses \"1000-iu-vitamin-c-to-mcg\" or \"25-mcg-to-iu\" etc.\n\/\/ returns null if it doesn't match an expected pattern\nfunction parseSlug(rawParam){\nif(!rawParam) return null;\nvar raw=decodeURIComponent(rawParam).toLowerCase().trim();\nvar dir,unitWord,core;\nif(raw.slice(-7)===\"-to-mcg\"){\ndir=\"iu2mcg\";\nunitWord=\"iu\";\ncore=raw.slice(0,-7);\n}else if(raw.slice(-6)===\"-to-iu\"){\ndir=\"mcg2iu\";\nunitWord=\"mcg\";\ncore=raw.slice(0,-6);\n}else{\nreturn null;\n}\nvar re=new RegExp(\"^([\\\\d.]+)-\"+unitWord+\"(?:-(.+))?$\");\nvar m=core.match(re);\nif(!m) return null;\nvar qty=parseFloat(m[1]);\nif(isNaN(qty)) return null;\nvar subSlug=m[2]||\"\";\nvar key=\"vitD\";\nfor(var k in SLUG){\nif(SLUG[k]===subSlug){key=k;break;}\n}\nif(subSlug!==\"\" && key===\"vitD\") return null; \/\/ unknown substance slug\nreturn {qty:qty,key:key,dir:dir};\n}\n\nfunction updateUrl(qty,key,dir){\nvar slug=slugFor(qty,key,dir);\nvar url=window.location.pathname+\"?convert=\"+slug;\ntry{\nwindow.history.pushState({convert:slug},\"\",url);\n}catch(e){}\nvar title;\nif(F[key]===null){\ntitle=NAME[key]+\" IU to mcg \u2014 No Standard Conversion\";\n}else if(dir===\"mcg2iu\"){\ntitle=qty+\" mcg to IU \u2014 \"+NAME[key]+\" Conversion\";\n}else{\ntitle=qty+\" IU to mcg \u2014 \"+NAME[key]+\" Conversion\";\n}\ndocument.title=title;\nvar metaDesc=document.querySelector('meta[name=\"description\"]');\nif(metaDesc){\nvar desc;\nif(F[key]===null){\ndesc=NAME[key]+\" has no official IU-to-mcg conversion factor. Learn why and see verified conversions for Vitamin D, A, E and C.\";\n}else if(dir===\"mcg2iu\"){\ndesc=qty+\" mcg of \"+NAME[key]+\" equals \"+fmt(qty\/F[key])+\" IU. Free IU to mcg converter with formulas for Vitamin D, A, E and C.\";\n}else{\ndesc=qty+\" IU of \"+NAME[key]+\" equals \"+fmt(qty*F[key])+\" mcg. Free IU to mcg converter with formulas for Vitamin D, A, E and C.\";\n}\nmetaDesc.setAttribute(\"content\",desc);\n}\nvar shareEl=document.getElementById(\"iucm-share\");\nshareEl.style.display=\"block\";\nshareEl.textContent=\"Shareable link: \"+window.location.origin+url;\nhighlightActive(slug);\n}\n\nfunction highlightActive(slug){\ndocument.querySelectorAll(\".similar-links a\").forEach(function(a){\nif(a.getAttribute(\"data-slug\")===slug){\na.classList.add(\"active\");\n}else{\na.classList.remove(\"active\");\n}\n});\n}\n\n\/\/ toggles the tool between \"normal conversion\" and \"no official IU\" states\nwindow.iucmOnSubChange=function(){\nvar sub=document.getElementById('iucm-sub');\nvar key=sub.value;\nvar noIU=(F[key]===null);\n\ndocument.getElementById('iucm-dir').disabled=noIU;\ndocument.getElementById('iucm-qty').disabled=noIU;\ndocument.getElementById('iucm-btn').disabled=noIU;\n\nvar noteEl=document.getElementById('iucm-note');\nvar resultEl=document.getElementById('iucm-result');\n\nif(noIU){\nresultEl.style.display='none';\nnoteEl.style.display='block';\nnoteEl.textContent=NO_IU_NOTE.split(\"{NAME}\").join(NAME[key]);\n}else{\nnoteEl.style.display='none';\n}\n};\n\n\/\/ keeps quantity label + From\/To boxes in sync with the chosen direction\nwindow.iucmOnDirChange=function(){\nvar dir=document.getElementById('iucm-dir').value;\nvar qtyLbl=document.getElementById('iucm-qty-lbl');\nvar fromSel=document.getElementById('iucm-from');\nvar toSel=document.getElementById('iucm-to');\nif(dir===\"mcg2iu\"){\nqtyLbl.textContent=\"Quantity (mcg)\";\nfromSel.innerHTML='<option selected>mcg<\/option>';\ntoSel.innerHTML='<option selected>IU<\/option>';\n}else{\nqtyLbl.textContent=\"Quantity (IU)\";\nfromSel.innerHTML='<option selected>IU<\/option>';\ntoSel.innerHTML='<option selected>mcg<\/option>';\n}\n};\n\nwindow.iucmSwap=function(){\nvar dirSel=document.getElementById('iucm-dir');\nif(dirSel.disabled) return;\ndirSel.value=(dirSel.value===\"iu2mcg\")?\"mcg2iu\":\"iu2mcg\";\niucmOnDirChange();\n};\n\nwindow.iucmCalc=function(pushUrl){\n\nvar sub=document.getElementById('iucm-sub');\nvar key=sub.value;\nvar name=sub.options[sub.selectedIndex].getAttribute('data-name');\n\nif(F[key]===null){\ndocument.getElementById('iucm-result').style.display='none';\ndocument.getElementById('iucm-note').style.display='block';\ndocument.getElementById('iucm-note').textContent=NO_IU_NOTE.split(\"{NAME}\").join(name);\nif(pushUrl){\nupdateUrl(document.getElementById('iucm-qty').value||0,key,document.getElementById('iucm-dir').value);\n}\nreturn;\n}\n\nvar qty=parseFloat(document.getElementById('iucm-qty').value);\nif(isNaN(qty)) return;\n\nvar dir=document.getElementById('iucm-dir').value;\n\nvar result, fromUnit, toUnit;\nif(dir===\"mcg2iu\"){\nresult=qty\/F[key];\nfromUnit=\"mcg\";\ntoUnit=\"IU\";\n}else{\nresult=qty*F[key];\nfromUnit=\"IU\";\ntoUnit=\"mcg\";\n}\n\ndocument.getElementById('iucm-out').textContent=\nfmt(result)+' '+toUnit;\n\ndocument.getElementById('iucm-eq').textContent=\nqty+' '+fromUnit+' of '+name+' = '+fmt(result)+' '+toUnit;\n\ndocument.getElementById('iucm-note').style.display='none';\ndocument.getElementById('iucm-result').style.display='block';\n\nif(pushUrl){\nupdateUrl(qty,key,dir);\n}\n\n};\n\n\/\/ builds the \"Popular IU to mcg Conversions\" link row (Vitamin D, IU -> mcg direction)\nfunction buildSimilar(){\nvar wrap=document.getElementById('iucm-sim-vitd');\nvar html=\"\";\nfor(var i=0;i<POPULAR_VITD.length;i++){\nvar qty=POPULAR_VITD[i];\nvar slug=slugFor(qty,'vitD','iu2mcg');\nhtml+='<a href=\"?convert='+slug+'\" data-slug=\"'+slug+'\" data-qty=\"'+qty+'\" data-key=\"vitD\" data-dir=\"iu2mcg\">'+qty+' IU<\/a>';\n}\nwrap.innerHTML=html;\n\n\/\/ intercept clicks so navigation is instant (no full reload) but the\n\/\/ href stays real, so the links work and are crawlable even without JS\ndocument.getElementById('iucm-similar').addEventListener('click',function(e){\nvar a=e.target.closest('a[data-slug]');\nif(!a) return;\ne.preventDefault();\ndocument.getElementById('iucm-qty').value=a.getAttribute('data-qty');\ndocument.getElementById('iucm-sub').value=a.getAttribute('data-key');\ndocument.getElementById('iucm-dir').value=a.getAttribute('data-dir');\niucmOnSubChange();\niucmOnDirChange();\niucmCalc(true);\nwindow.scrollTo({top:document.getElementById('iucm').offsetTop-20,behavior:'smooth'});\n});\n}\n\nfunction loadFromUrl(){\nvar params=new URLSearchParams(window.location.search);\nvar parsed=parseSlug(params.get('convert'));\nif(parsed){\ndocument.getElementById('iucm-qty').value=parsed.qty;\ndocument.getElementById('iucm-sub').value=parsed.key;\ndocument.getElementById('iucm-dir').value=parsed.dir;\niucmOnSubChange();\niucmOnDirChange();\niucmCalc(false); \/\/ don't re-push, URL is already correct\nupdateUrl(parsed.qty,parsed.key,parsed.dir); \/\/ still set title\/meta\/highlight\/share text\n}else{\niucmOnSubChange();\niucmOnDirChange();\niucmCalc(false);\n}\n}\n\n\/\/ handle browser back\/forward\nwindow.addEventListener('popstate',function(){\nloadFromUrl();\n});\n\nwindow.addEventListener('load',function(){\nbuildSimilar();\nloadFromUrl();\n});\n\n})();\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>More Converters<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/wetflagcalculator.com\/iu-to-mg-converter\/\">IU to Mg Converter<\/a><br><a href=\"https:\/\/wetflagcalculator.com\/litre-to-kg-converter\/\">Liter To Kg<\/a><br><a href=\"https:\/\/wetflagcalculator.com\/ml-to-g-converter-calculator\/\">ML to Grams<\/a><br><a class=\"row-title\" href=\"https:\/\/wetflagcalculator.com\/mpg-to-liters-per-100km-converter\/\">MPG to Liters per 100km Converter<\/a><br><a class=\"row-title\" href=\"https:\/\/wetflagcalculator.com\/gallon-to-liter-converter\/\">Gallon to Liter Converter Calculator<\/a><\/p>\n\n\n<p>International Units, or IU, show up on vitamin bottles and supplement labels next to mass units like mcg, and the two rarely match at a glance. That&#8217;s because IU isn&#8217;t a weight at all, it&#8217;s a measure of biological activity. This guide explains what that means in practice, gives you the correct conversion factor for each vitamin that actually uses IU, and works through the numbers people search for most.<\/p>\n<h2>IU as Mcg: A Simple Answer<\/h2>\n<p>IU and mcg are not interchangeable using one universal formula. Each vitamin, and in some cases each form of that vitamin, has its own conversion factor. Only three vitamins use IU at all: Vitamin D, Vitamin A, and Vitamin E. Vitamin C, B12, K, and the other B vitamins are measured purely by mass, so putting them into an IU converter doesn&#8217;t make sense; if you see &#8220;IU&#8221; attached to one of those, double-check the label.<\/p>\n<h2>Why IU Isn&#8217;t a Weight<\/h2>\n<p>A milligram is always a milligram, regardless of what you&#8217;re weighing. An International Unit is different: it&#8217;s defined separately for each substance, based on the biological effect a lab-standardized amount produces. That&#8217;s why 1 IU of Vitamin D weighs a different amount than 1 IU of Vitamin A, and why Vitamin A itself splits into different factors depending on whether it comes from retinol or beta-carotene. The unit was designed for consistency of effect, not consistency of mass.<\/p>\n<h2>Conversion Factors by Vitamin<\/h2>\n<p>These are the factors you actually need, sourced from NIH Office of Dietary Supplements fact sheets and FDA supplement-labeling guidance.<\/p>\n<table width=\"936\">\n<tbody>\n<tr>\n<td width=\"468\">\n<p><strong>Vitamin \/ Form<\/strong><\/p>\n<\/td>\n<td width=\"468\">\n<p><strong>1 IU equals<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"468\">\n<p>Vitamin D (D2 or D3)<\/p>\n<\/td>\n<td width=\"468\">\n<p>0.025 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"468\">\n<p>Vitamin A \u2014 Retinol<\/p>\n<\/td>\n<td width=\"468\">\n<p>0.3 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"468\">\n<p>Vitamin A \u2014 Beta-Carotene<\/p>\n<\/td>\n<td width=\"468\">\n<p>0.6 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"468\">\n<p>Vitamin E \u2014 Natural (d-alpha-tocopherol)<\/p>\n<\/td>\n<td width=\"468\">\n<p>670 mcg (0.67 mg)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"468\">\n<p>Vitamin E \u2014 Synthetic (dl-alpha-tocopherol)<\/p>\n<\/td>\n<td width=\"468\">\n<p>450 mcg (0.45 mg)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2>How to Convert IU to mcg<\/h2>\n<p>The formula is:<\/p>\n<p><strong>micrograms = IU \u00d7 conversion factor<\/strong><\/p>\n<ul>\n<li>Step 1: Identify the exact vitamin and form on the label (natural vs. synthetic matters for Vitamin E; retinol vs. beta-carotene matters for Vitamin A).<\/li>\n<li>Step 2: Look up that form&#8217;s conversion factor from the table above.<\/li>\n<li>Step 3: Multiply the IU amount by the factor to get micrograms.<\/li>\n<\/ul>\n<h2>How to Convert mcg to IU<\/h2>\n<p>Reversing the formula gives you IU from a mass figure:<\/p>\n<p><strong>IU = micrograms \u00f7 conversion factor<\/strong><\/p>\n<p>This is the direction you&#8217;ll use when a newer label shows mcg but you want to compare it against an older product or a dosing chart that&#8217;s still listed in IU.<\/p>\n<h2>IU to mcg: Worked Examples (Vitamin D)<\/h2>\n<p>Vitamin D is the most commonly searched conversion, and the cleanest to calculate, since the factor is a flat 0.025 mcg per IU.<\/p>\n<h3>100 IU to mcg<\/h3>\n<p>100 IU \u00d7 0.025 mcg\/IU = 2.5 mcg<\/p>\n<h3>400 IU to mcg<\/h3>\n<p>400 IU \u00d7 0.025 mcg\/IU = 10 mcg<\/p>\n<h3>1000 IU to mcg<\/h3>\n<p>1000 IU \u00d7 0.025 mcg\/IU = 25 mcg<\/p>\n<h3>2000 IU to mcg<\/h3>\n<p>2000 IU \u00d7 0.025 mcg\/IU = 50 mcg<\/p>\n<h3>5000 IU to mcg<\/h3>\n<p>5000 IU \u00d7 0.025 mcg\/IU = 125 mcg<\/p>\n<p>400 IU (10 mcg) lines up with the standard adult Vitamin D recommendation used on many supplement labels, which is why it&#8217;s such a common reference point.<\/p>\n<h2>Quick-Reference Chart: Same IU Amount, Different Vitamins<\/h2>\n<p>This is where people get tripped up, the same IU number means a completely different mcg amount depending on which vitamin it&#8217;s attached to.<\/p>\n<table width=\"936\">\n<tbody>\n<tr>\n<td width=\"180\">\n<p><strong>IU Amount<\/strong><\/p>\n<\/td>\n<td width=\"189\">\n<p><strong>Vitamin D<\/strong><\/p>\n<\/td>\n<td width=\"189\">\n<p><strong>Vitamin A (Retinol)<\/strong><\/p>\n<\/td>\n<td width=\"189\">\n<p><strong>Vitamin A (Beta-Carotene)<\/strong><\/p>\n<\/td>\n<td width=\"189\">\n<p><strong>Vitamin E (Natural)<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"180\">\n<p>100 IU<\/p>\n<\/td>\n<td width=\"189\">\n<p>2.5 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>30 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>60 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>67 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"180\">\n<p>400 IU<\/p>\n<\/td>\n<td width=\"189\">\n<p>10 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>120 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>240 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>268 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"180\">\n<p>1000 IU<\/p>\n<\/td>\n<td width=\"189\">\n<p>25 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>300 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>600 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>670 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"180\">\n<p>2000 IU<\/p>\n<\/td>\n<td width=\"189\">\n<p>50 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>600 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>1200 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>1340 mcg<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"180\">\n<p>5000 IU<\/p>\n<\/td>\n<td width=\"189\">\n<p>125 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>1500 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>3000 mcg<\/p>\n<\/td>\n<td width=\"189\">\n<p>3350 mcg<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2>mcg to IU: A Worked Example<\/h2>\n<p>A newer supplement label lists 15 mcg of Vitamin D and you want to compare it to an older product listed in IU:<\/p>\n<p>15 mcg \u00f7 0.025 mcg\/IU = 600 IU<\/p>\n<p>That&#8217;s roughly 1.5 times the old 400 IU standard dose, useful context if you&#8217;re comparing two products side by side.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>Is IU the same as mcg?<\/h3>\n<p>No. IU measures biological activity, mcg measures mass. They only relate to each other through a substance-specific conversion factor, there&#8217;s no universal formula that works for every vitamin.<\/p>\n<h3>Why does Vitamin A have two different conversion factors?<\/h3>\n<p>Because &#8220;Vitamin A&#8221; on a label can come from two different sources, preformed retinol or plant-based beta-carotene, and the body converts them into active Vitamin A at different rates. Retinol is more efficiently used, so it takes less of it to equal 1 IU.<\/p>\n<h3>Why does Vitamin E have a natural and synthetic factor?<\/h3>\n<p>Natural Vitamin E (d-alpha-tocopherol) is more biologically active than the synthetic form (dl-alpha-tocopherol), so it takes fewer milligrams of the natural form to reach 1 IU of activity.<\/p>\n<h3>How many mcg is 400 IU of Vitamin D?<\/h3>\n<p>10 mcg, using the standard 0.025 mcg per IU factor.<\/p>\n<h3>Can I convert Vitamin C or B12 from IU to mcg?<\/h3>\n<p>No, those vitamins aren&#8217;t measured in IU at all. If a label or chart shows an IU figure next to Vitamin C, it&#8217;s worth double-checking the source, since Vitamin C is mass-only under current labeling standards.<\/p>\n<h2>Try the Calculator<\/h2>\n<p>Rather than looking up factors and multiplying by hand, our IU to mcg Converter handles Vitamin D, A, and E, in both directions, using the exact factor for each form.<\/p>","protected":false},"excerpt":{"rendered":"<p>IU to mcg Converter Substance Vitamin D (D2 \/ D3)Vitamin A \u2014 retinolVitamin A \u2014 beta-caroteneVitamin E \u2014 naturalVitamin E \u2014 syntheticVitamin CVitamin B12Vitamin K2 Direction IU \u2192 mcgmcg \u2192 IU Quantity (IU) From IU \u21c5 To mcg Convert IU to mcg Conversion Chart (per 10 IU) Vitamin 10 IU in mcg Vitamin D (D2&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1533","post","type-post","status-publish","format-standard","hentry","category-wetflag"],"_links":{"self":[{"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/posts\/1533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/comments?post=1533"}],"version-history":[{"count":0,"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/posts\/1533\/revisions"}],"wp:attachment":[{"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/media?parent=1533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/categories?post=1533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wetflagcalculator.com\/es\/wp-json\/wp\/v2\/tags?post=1533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}