{"id":2885,"date":"2026-09-02T12:53:55","date_gmt":"2026-09-02T10:53:55","guid":{"rendered":"https:\/\/peptelia.com\/peptid-rechner-2\/"},"modified":"2026-10-08T19:31:16","modified_gmt":"2026-10-08T17:31:16","slug":"peptide-calculator","status":"publish","type":"page","link":"https:\/\/peptelia.com\/en\/peptide-calculator\/","title":{"rendered":"Peptide Calculator"},"content":{"rendered":"\n<style>\n  :root{\n    --snx-navy:#10201F;\n    --snx-blue:#0C8F80;\n    --snx-accent:#3AA795;\n    --snx-ink:#10201F;\n    --snx-muted:#4B4A44;\n    --snx-line:#E8DFD2;\n    --snx-card:#FFFDFA;\n    --snx-soft:#F3EDE4;\n    --snx-warn-bg:#fff4e5;\n    --snx-warn-bd:#C77A2B;\n    --snx-warn-tx:#8a5a00;\n    --snx-radius:3px;\n    --snx-font:'Helvetica Neue',Helvetica,Arial,sans-serif;\n  }\n  .snx-app,.snx-app *{box-sizing:border-box}\n  .snx-app{font-family:var(--snx-font);color:var(--snx-ink);\n    background:radial-gradient(1200px 500px at 80% -10%,rgba(12,143,128,.08),transparent 60%),#FAF6F0;\n 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.snx-faq{margin-top:26px;background:var(--snx-card);border:1px solid var(--snx-line);border-radius:var(--snx-radius);padding:8px 20px}\n  .snx-faq details{border-bottom:1px solid var(--snx-line)}\n  .snx-faq details:last-child{border-bottom:none}\n  .snx-faq summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700;font-size:14.5px;display:flex;justify-content:space-between;align-items:center}\n  .snx-faq summary::-webkit-details-marker{display:none}\n  .snx-faq summary::after{content:\"+\";font-size:20px;color:var(--snx-blue);font-weight:400}\n  .snx-faq details[open] summary::after{content:\"\u2013\"}\n  .snx-faq p{margin:0 0 16px;color:var(--snx-muted);font-size:14px;line-height:1.65}\n  .snx-disc{margin-top:20px;text-align:center;font-size:12px;color:var(--snx-muted);line-height:1.6}\n  .snx-disc b{color:var(--snx-ink)}\n<\/style>\n<div class=\"snx-app\">\n<div class=\"snx-wrap\">\n  <div class=\"snx-head\">\n    <div class=\"snx-logo\">Pept\u00e9lia<small>PEPTIDES<\/small>\n<\/div>\n    <h2 style=\"font-size:clamp(24px,4vw,34px);line-height:1.15;margin:16px 0 8px;font-weight:800;letter-spacing:.2px\">Peptide Calculator<\/h2>\n    <p>Calculate in seconds how many units to draw up after reconstituting your peptide with bacteriostatic water. For research and analytical purposes.<\/p>\n  <\/div>\n  <div class=\"snx-grid\">\n    <div>\n      <div class=\"snx-card snx-step\" style=\"margin-bottom:18px\">\n        <h2>\n<span class=\"snx-step-no\">1<\/span>Syringe<\/h2>\n        <div class=\"snx-chips\" id=\"syringe\">\n          <div class=\"snx-chip\" data-val=\"30\">0.3 ml<small>30 units<\/small>\n<\/div>\n          <div class=\"snx-chip\" data-val=\"50\">0.5 ml<small>50 units<\/small>\n<\/div>\n          <div class=\"snx-chip active\" data-val=\"100\">1.0 ml<small>100 units<\/small>\n<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"snx-card snx-step\" style=\"margin-bottom:18px\">\n        <h2>\n<span class=\"snx-step-no\">2<\/span>Vial size (peptide)<\/h2>\n        <div class=\"snx-chips\" id=\"vial\">\n          <div class=\"snx-chip\" data-val=\"5\">5 mg<\/div>\n          <div class=\"snx-chip active\" data-val=\"10\">10 mg<\/div>\n          <div class=\"snx-chip\" data-val=\"15\">15 mg<\/div>\n        <\/div>\n        <div class=\"snx-custom\">\n          <label>Other amount:<\/label>\n          <input class=\"snx-input\" id=\"vialCustom\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"0.1\" placeholder=\"e.g. 20\">\n          <span class=\"snx-unit\">mg<\/span>\n        <\/div>\n      <\/div>\n      <div class=\"snx-card snx-step\" style=\"margin-bottom:18px\">\n        <h2>\n<span class=\"snx-step-no\">3<\/span>Solvent volume (water)<\/h2>\n        <div class=\"snx-chips\" id=\"water\">\n          <div class=\"snx-chip\" data-val=\"1\">1 ml<\/div>\n          <div class=\"snx-chip active\" data-val=\"2\">2 ml<\/div>\n          <div class=\"snx-chip\" data-val=\"3\">3 ml<\/div>\n          <div class=\"snx-chip\" data-val=\"5\">5 ml<\/div>\n        <\/div>\n        <div class=\"snx-custom\">\n          <label>Other amount:<\/label>\n          <input class=\"snx-input\" id=\"waterCustom\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"0.1\" placeholder=\"e.g. 2.5\">\n          <span class=\"snx-unit\">ml<\/span>\n        <\/div>\n      <\/div>\n      <div class=\"snx-card snx-step\">\n        <h2>\n<span class=\"snx-step-no\">4<\/span>Desired single dose<\/h2>\n        <div class=\"snx-chips\" id=\"dose\">\n          <div class=\"snx-chip\" data-val=\"50\">50 mcg<\/div>\n          <div class=\"snx-chip\" data-val=\"100\">100 mcg<\/div>\n          <div class=\"snx-chip active\" data-val=\"250\">250 mcg<\/div>\n          <div class=\"snx-chip\" data-val=\"500\">500 mcg<\/div>\n        <\/div>\n        <div class=\"snx-custom\">\n          <label>Other amount:<\/label>\n          <input class=\"snx-input\" id=\"doseCustom\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"1\" placeholder=\"e.g. 300\">\n          <span class=\"snx-unit\">mcg<\/span>\n        <\/div>\n        <div class=\"snx-weight\">\n          <label class=\"snx-toggle\"><input type=\"checkbox\" id=\"wToggle\"> \u2696\ufe0f Dose by body weight (optional)<\/label>\n          <div id=\"wBody\" style=\"display:none;margin-top:12px\">\n            <div class=\"row\">\n              <div class=\"fld\">\n<span>Body weight<\/span><input class=\"snx-input\" id=\"bw\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"1\" placeholder=\"kg\">\n<\/div>\n              <div class=\"fld\">\n<span>Dose per kg<\/span><input class=\"snx-input\" id=\"dpk\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"0.1\" placeholder=\"mcg\/kg\">\n<\/div>\n            <\/div>\n            <div class=\"total\">Total dose: <b id=\"totalDose\">\u2013<\/b> <small>(overrides the single dose above)<\/small>\n<\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div>\n      <div class=\"snx-result\">\n        <div class=\"lead\">Your result<\/div>\n        <div class=\"snx-units\">\n<span class=\"num\" id=\"rUnits\">5<\/span><span class=\"lab\">units to draw up<\/span>\n<\/div>\n        <div class=\"snx-sub\" id=\"rSub\">Draw the syringe up to the <b>5<\/b>-unit mark.<\/div>\n        <div class=\"snx-scale\">\n          <div class=\"cap\">\n<span>Syringe fill level<\/span><span id=\"rCapTxt\">5 \/ 100 units<\/span>\n<\/div>\n          <div class=\"snx-bar\"><div class=\"fill\" id=\"rFill\"><\/div><\/div>\n        <\/div>\n        <div class=\"snx-metrics\">\n          <div class=\"snx-metric\">\n<div class=\"k\">Concentration<\/div>\n<div class=\"v\" id=\"rConc\">5,000 <small>mcg\/ml<\/small>\n<\/div>\n<\/div>\n          <div class=\"snx-metric\">\n<div class=\"k\">Volume \/ dose<\/div>\n<div class=\"v\" id=\"rVol\">0.050 <small>ml<\/small>\n<\/div>\n<\/div>\n          <div class=\"snx-metric\">\n<div class=\"k\">Doses \/ vial<\/div>\n<div class=\"v\" id=\"rDoses\">40 <small>doses<\/small>\n<\/div>\n<\/div>\n          <div class=\"snx-metric\">\n<div class=\"k\">Dose<\/div>\n<div class=\"v\" id=\"rDose\">250 <small>mcg<\/small>\n<\/div>\n<\/div>\n        <\/div>\n        <div class=\"snx-warn\" id=\"rWarn\"><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n  <div class=\"snx-faq\">\n    <details open>\n      <summary>What is the difference between mg, mcg and units?<\/summary>\n      <p><b>mg (milligrams)<\/b> is the amount of peptide in the vial. <b>mcg (micrograms)<\/b> is your single dose \u2013 1 mg = 1,000 mcg. <b>Units<\/b> are the markings on the insulin syringe: on every standard insulin syringe, 1 unit = 0.01 ml. The scale does not change with syringe size \u2013 only the maximum capacity does (30, 50 or 100 units).<\/p>\n    <\/details>\n    <details>\n      <summary>How much bacteriostatic water should I use?<\/summary>\n      <p>The water volume determines the concentration and therefore how many units you draw up per dose. More water = lower concentration = more units per dose (easier to read precisely). Less water = higher concentration = fewer units. Choose the volume so that your target dose can be read comfortably on the syringe scale. How long a prepared solution remains stable is explained in the <a href=\"https:\/\/peptelia.com\/en\/storage-stability\/\">Storage &amp; Stability<\/a> guide.<\/p>\n    <\/details>\n    <details>\n      <summary>Why does the same dose correspond to a different number of markings?<\/summary>\n      <p>The markings on a syringe vary with its size, which is why the same dose can correspond to a different number of markings on different syringes. The calculator always converts your volume correctly into the matching number of units and warns you if the amount does not fit into the selected syringe.<\/p>\n    <\/details>\n  <\/div>\n  <div class=\"snx-disc\">\n    <b>Note:<\/b> This calculator is intended solely for research, analytical and educational purposes. <br>\n    Not medical advice. Pept\u00e9lia products are not intended for human use.\n  <\/div>\n<\/div>\n<script>\n(function(){\n  var state = { syringe:100, vial:10, water:2, dose:250 }; var dpkHigh=false; var DPK_MAX=50;\n  function fmt(n, d){ if(!isFinite(n)) return \"\u2013\"; return n.toLocaleString('en-GB',{minimumFractionDigits:d,maximumFractionDigits:d}); }\n  function chipGroup(id, key, onSet){\n    var wrap = document.getElementById(id);\n    wrap.querySelectorAll('.snx-chip').forEach(function(c){\n      c.addEventListener('click', function(){\n        wrap.querySelectorAll('.snx-chip').forEach(function(x){x.classList.remove('active')});\n        c.classList.add('active');\n        state[key] = parseFloat(c.getAttribute('data-val'));\n        if(onSet) onSet(); calc();\n      });\n    });\n  }\n  function bindCustom(inputId, groupId, key){\n    var el = document.getElementById(inputId);\n    el.addEventListener('input', function(){\n      var v = parseFloat(el.value.replace(',','.'));\n      if(isFinite(v) && v>0){ document.getElementById(groupId).querySelectorAll('.snx-chip').forEach(function(x){x.classList.remove('active')}); state[key] = v; }\n      else { var act = document.getElementById(groupId).querySelector('.snx-chip.active'); if(act) state[key] = parseFloat(act.getAttribute('data-val')); }\n      calc();\n    });\n  }\n  chipGroup('syringe','syringe');\n  chipGroup('vial','vial', function(){ document.getElementById('vialCustom').value=''; });\n  chipGroup('water','water', function(){ document.getElementById('waterCustom').value=''; });\n  chipGroup('dose','dose', function(){ document.getElementById('doseCustom').value=''; manualDose(); });\n  bindCustom('vialCustom','vial','vial');\n  bindCustom('waterCustom','water','water');\n  function manualDose(){ var t=document.getElementById('wToggle'); if(t && t.checked){ t.checked=false; document.getElementById('wBody').style.display='none'; } setWeightUI(); }\n  function setWeightUI(){ var on=document.getElementById('wToggle').checked; ['dose','doseCustom'].forEach(function(id){ var el=document.getElementById(id); if(el){ el.style.opacity=on?'0.45':''; } }); }\n  document.getElementById('doseCustom').addEventListener('input', manualDose);\n  bindCustom('doseCustom','dose','dose');\n  var wToggle = document.getElementById('wToggle');\n  wToggle.addEventListener('change', function(){ document.getElementById('wBody').style.display = wToggle.checked ? 'block':'none'; setWeightUI(); calc(); });\n  setWeightUI();\n  document.getElementById('bw').addEventListener('input', calc);\n  document.getElementById('dpk').addEventListener('input', calc);\n  function effectiveDose(){\n    dpkHigh=false;\n    if(wToggle.checked){\n      var bw = parseFloat((document.getElementById('bw').value||'').replace(',','.'));\n      var dpk = parseFloat((document.getElementById('dpk').value||'').replace(',','.'));\n      if(isFinite(bw)&&isFinite(dpk)&&bw>0&&dpk>0){ dpkHigh = dpk>DPK_MAX; var t = bw*dpk; document.getElementById('totalDose').textContent = fmt(t,0)+' mcg'; return t; }\n      document.getElementById('totalDose').textContent = '\u2013';\n    }\n    return state.dose;\n  }\n  function calc(){\n    var dose = effectiveDose();\n    var conc = (state.vial*1000)\/state.water;\n    var volPerDose = dose\/conc;\n    var units = volPerDose*100;\n    var dosesPerVial = Math.floor(state.water\/volPerDose);\n    var cap = state.syringe;\n    document.getElementById('rUnits').textContent = fmt(units,2);\n    document.getElementById('rSub').innerHTML = 'Draw the syringe up to the <b>'+fmt(units,2)+'<\/b>-unit mark.';\n    document.getElementById('rConc').innerHTML = fmt(conc,0)+' <small>mcg\/ml<\/small>';\n    document.getElementById('rVol').innerHTML = fmt(volPerDose,3)+' <small>ml<\/small>';\n    document.getElementById('rDoses').innerHTML = (isFinite(dosesPerVial)?dosesPerVial:'\u2013')+' <small>doses<\/small>';\n    document.getElementById('rDose').innerHTML = fmt(dose,0)+' <small>mcg<\/small>';\n    document.getElementById('rCapTxt').textContent = fmt(units,2)+' \/ '+cap+' units';\n    var pct = Math.max(0, Math.min(100, (units\/cap)*100));\n    var fill = document.getElementById('rFill'); fill.style.width = pct+'%';\n    var warn = document.getElementById('rWarn');\n    if(units>cap){\n      fill.classList.add('over');\n      var next = cap<50?'a 0.5 ml (50 units) syringe':(cap<100?'a 1.0 ml (100 units) syringe':'a larger vial-to-water ratio');\n      warn.className='snx-warn show';\n      warn.innerHTML='\u26a0\ufe0f <b>Warning:<\/b> The required amount ('+fmt(units,2)+' units) does not fit into your '+(cap===30?'0.3 ml':cap===50?'0.5 ml':'1.0 ml')+' syringe (max. '+cap+' units). Use '+next+' or more water.';\n    } else { fill.classList.remove('over'); warn.className='snx-warn'; warn.innerHTML=''; }\n    if(dpkHigh){ warn.className='snx-warn show'; warn.innerHTML += (warn.innerHTML?'<br><br>':'') + '\u26a0\ufe0f <b>Plausibility check:<\/b> '+fmt(parseFloat((document.getElementById('dpk').value||'').replace(',','.')),1)+' mcg\/kg is unusually high. Most research protocols are well below '+DPK_MAX+' mcg\/kg \u2013 please check your input (mcg vs. mg).'; }\n  }\n  calc();\n})();\n<\/script>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Calculate in seconds how many units to draw up after reconstituting a peptide with bacteriostatic water \u2013 for research and analytical purposes.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","footnotes":""},"class_list":["post-2885","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Peptide Calculator: Concentration &amp; Volume | Pept\u00e9lia<\/title>\n<meta name=\"description\" content=\"Free peptide calculator: work out concentration and withdrawal volume from vial size and diluent volume for reconstituted research peptides.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/peptelia.com\/en\/peptide-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Peptide Calculator: Concentration &amp; 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