<!DOCTYPE html>

<head>

<title>Peptide Reconstitution Calculator</title>

<style>

:root{

--text:#111827;

--muted:#6b7280;

--line:#e5e7eb;

--accent:#2563eb;

--calcbg:#f9fafb;

--card-dose-bg:#f8fafc; /* cool blue-gray */

--card-recon-bg:#f0f7ff; /* light modern blue */

}

*{box-sizing:border-box}

body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--text);background:transparent}

.wrap{max-width:720px;margin:0 auto;padding:16px}

.card{

border:1px solid var(--line);

border-radius:12px;

padding:16px;

background:#fff;

}

.card-dose{background:var(--card-dose-bg); margin-bottom:24px;} /* visual separation */

.card-recon{background:var(--card-recon-bg);}

/* Tighter title/description spacing */

h3{margin:0 0 2px;font-size:20px}

.sub{margin:0 0 4px;color:var(--muted);font-size:14px}

/* Ensure no inline style can widen spacing */

.card h3 + .sub{margin-bottom:4px !important;}

.section{margin:8px 0 6px;font-size:13px;font-weight:800;color:#374151}

.grid{display:grid;gap:12px;grid-template-columns:1fr}

@media(min-width:680px){.grid{grid-template-columns:repeat(3,1fr)}}

label{display:block;font-size:12px;font-weight:700;margin-bottom:6px;color:#374151}

.row{display:flex;gap:8px;align-items:center}

/* Inputs set to 75% width of the row */

input,select{

flex:1;

padding:10px 12px;

border:1px solid var(--line);

border-radius:10px;

outline:none;

background:#fff;

max-width:75%;

}

input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.15)}

.results{display:grid;gap:12px;margin-top:8px;grid-template-columns:1fr}

@media(min-width:680px){.results{grid-template-columns:repeat(4,1fr)}}

.results.recon{grid-template-columns:1fr}

@media(min-width:680px){.results.recon{grid-template-columns:repeat(3,1fr)}}

.stat{border:1px solid var(--line);border-radius:10px;padding:12px;background:var(--calcbg)}

.stat h4{margin:0 0 4px;color:var(--muted);font-size:12px}

.stat p{margin:0;font-size:18px;font-variant-numeric:tabular-nums}

.foot{margin-top:8px;color:var(--muted);font-size:12px}

/* Remove number input spinners */

input[type=number]::-webkit-outer-spin-button,

input[type=number]::-webkit-inner-spin-button{ -webkit-appearance: none; margin: 0; }

input[type=number]{ -moz-appearance: textfield; appearance: textfield; }

/* ---- tighten title + description spacing (force override) ---- */

.card > h3{

margin: 0 !important;

line-height: 1.25;

}

.card > .sub{

margin: 2px 0 4px !important; /* small top + bottom gap */

line-height: 1.35;

}

/* nudge the inputs closer to the subtitle */

.card .grid{

margin-top: 4px !important;

}

/* control subtitle spacing globally */

.card > .sub { margin: 2px 0 24px !important; line-height: 1.35; }

/* ensure the grid doesn't cap the gap — let the subtitle margin define it */

.card .grid { margin-top: 0 !important; }

</style>

</head>

<body>

<h3>Peptide Dose Calculator</h3>

<p class="sub">Determine how many syringe units to draw for your desired peptide dose and reconstitution volume.<br></br></p>

<div>

<label>Peptide Vial Contents (mg)</label>

<option value="" selected disabled>Select mg</option>

<option value="other">Other</option>

</select>mg

</div>

<div>

<label>Bacteriostatic Water (mL)</label>

<option value="" selected disabled>Select mL</option>

<option value="other">Other</option>

</select>mL

</div>

<div>

<label>Desired Dose</label>

<option value="" selected disabled>Select unit</option>

</select>

</div>

</div>

<div class="section">Results:</div>

<div class="stat"><h4>Draw syringe to</h4><p id="units">—</p></div>

<div class="stat"><h4>Peptide dose</h4><p id="doseEcho">—</p></div>

<div class="stat"><h4>Concentration</h4><p id="conc">—</p></div>

<div class="stat"><h4>Doses per vial</h4><p id="doses">—</p></div>

</div>

Formulas: <strong>units</strong> = (dose mg ÷ concentration mg/mL) × 100;

<strong>dose</strong> shows your input converted to mg;

<strong>concentration</strong> = vial mg ÷ mL;

<strong>doses per vial</strong> = vial mg ÷ dose mg.

</div>

<h3>Peptide Reconstitution Calculator</h3>

<p class="sub">Determine the ideal amount of bacteriostatic water to add for your desired syringe draw units and dose strength.<br></br></p>

<div>

<label>Peptide Vial Contents (mg)</label>

<option value="" selected disabled>Select mg</option>

<option value="other">Other</option>

</select>mg

</div>

<div>

<label>Desired Dose</label>

<option value="" selected disabled>Select unit</option>

</select>

</div>

</div>

<div>

<label>Desired Draw (units)</label>

</div>

<div class="section">Results:</div>

<div class="stat"><h4>Bacteriostatic water to add</h4><p id="reconWater">—</p></div>

<div class="stat"><h4>Resulting concentration</h4><p id="reconConc">—</p></div>

<div class="stat"><h4>Doses per vial</h4><p id="reconDoses">—</p></div>

</div>

Formulas: <strong>water (mL)</strong> = (units × vial mg) ÷ (dose mg × 100);

<strong>concentration</strong> = vial mg ÷ water mL;

<strong>doses per vial</strong> = vial mg ÷ dose mg.

</div>

// ===== Dose Calculator =====

(function(){

const vialPreset=document.getElementById('vialPreset');

const vialMgOther=document.getElementById('vialMgOther');

const waterPreset=document.getElementById('waterPreset');

const waterMlOther=document.getElementById('waterMlOther');

const doseValue=document.getElementById('doseValue');

const doseUnit=document.getElementById('doseUnit');

const unitsEl=document.getElementById('units');

const concEl=document.getElementById('conc');

const dosesEl=document.getElementById('doses');

const doseEcho=document.getElementById('doseEcho');

const doseHelp=document.getElementById('doseHelp');

const fmt=(n,dec=2)=>!isFinite(n)?'—':(+n.toFixed(dec)).toString();

function reset(){ unitsEl.textContent=concEl.textContent=dosesEl.textContent=doseEcho.textContent='—'; doseHelp.textContent=''; }

function getVialMg(){

if(vialPreset.value==='other'){ return parseFloat(vialMgOther.value); }

return parseFloat(vialPreset.value);

}

function getWaterMl(){

if(waterPreset.value==='other'){ return parseFloat(waterMlOther.value); }

return parseFloat(waterPreset.value);

}

function compute(){

const vial=getVialMg();

const water=getWaterMl();

const rawDose=parseFloat(doseValue.value);

const unit=doseUnit.value;

if(!isFinite(vial) || !isFinite(water) || !isFinite(rawDose) || !unit){ reset(); return; }

const doseMg=(unit==='mcg')? rawDose/1000 : rawDose;

doseHelp.textContent = (unit==='mg')

? `${fmt(rawDose)} mg = ${fmt(rawDose*1000,0)} mcg`

: `${fmt(rawDose,0)} mcg = ${fmt(rawDose/1000)} mg`;

if(water<=0||vial<=0||doseMg<=0){ reset(); return; }

const conc=vial/water;

const mlPerDose=doseMg/conc;

const units=mlPerDose*100;

const doses=vial/doseMg;

unitsEl.textContent=`${fmt(units,1)} units`;

concEl.textContent=`${fmt(conc,3)} mg/mL`;

dosesEl.textContent=`${fmt(doses,1)}`;

doseEcho.textContent=`${fmt(doseMg,3)} mg`;

}

function syncVial(){

const showOther = vialPreset.value==='other';

vialMgOther.style.display = showOther ? 'block' : 'none';

compute();

}

function syncWater(){

const showOther = waterPreset.value==='other';

waterMlOther.style.display = showOther ? 'block' : 'none';

compute();

}

['input','change'].forEach(ev=>{

[vialPreset,vialMgOther,waterPreset,waterMlOther,doseValue,doseUnit].forEach(el=>el.addEventListener(ev,compute));

vialPreset.addEventListener(ev,syncVial);

waterPreset.addEventListener(ev,syncWater);

});

reset();

})();

// ===== Reconstitution Calculator =====

(function(){

const vialPreset2=document.getElementById('vialPreset2');

const vialMgOther2=document.getElementById('vialMgOther2');

const doseValue2=document.getElementById('doseValue2');

const doseUnit2=document.getElementById('doseUnit2');

const targetUnits2=document.getElementById('targetUnits2');

const reconWater=document.getElementById('reconWater');

const reconConc=document.getElementById('reconConc');

const reconDoses=document.getElementById('reconDoses');

const doseHelp2=document.getElementById('doseHelp2');

const fmt2=(n,dec=2)=>!isFinite(n)?'—':(+n.toFixed(dec)).toString();

function reset2(){ reconWater.textContent=reconConc.textContent=reconDoses.textContent='—'; doseHelp2.textContent=''; }

function getVialMg2(){

if(vialPreset2.value==='other'){ return parseFloat(vialMgOther2.value); }

return parseFloat(vialPreset2.value);

}

function compute2(){

const vial=getVialMg2();

const rawDose=parseFloat(doseValue2.value);

const unit=doseUnit2.value;

const targetUnits=parseFloat(targetUnits2.value);

if(!isFinite(vial) || !isFinite(rawDose) || !unit || !isFinite(targetUnits)){ reset2(); return; }

const doseMg=(unit==='mcg')? rawDose/1000 : rawDose;

doseHelp2.textContent = (unit==='mg')

? `${fmt2(rawDose)} mg = ${fmt2(rawDose*1000,0)} mcg`

: `${fmt2(rawDose,0)} mcg = ${fmt2(rawDose/1000)} mg`;

if(doseMg<=0 || vial<=0 || targetUnits<=0){ reset2(); return; }

const water = (targetUnits * vial) / (doseMg * 100);

const conc = vial / water;

const doses = vial / doseMg;

reconWater.textContent = `${fmt2(water,3)} mL`;

reconConc.textContent = `${fmt2(conc,3)} mg/mL`;

reconDoses.textContent = `${fmt2(doses,1)}`;

}

function syncVial2(){

const showOther = vialPreset2.value==='other';

vialMgOther2.style.display = showOther ? 'block' : 'none';

compute2();

}

['input','change'].forEach(ev=>{

[vialPreset2,vialMgOther2,doseValue2,doseUnit2,targetUnits2].forEach(el=>el.addEventListener(ev,compute2));

vialPreset2.addEventListener(ev,syncVial2);

});

reset2();

})();

</script>

</body>

</html>