Veterinary Dehydration Fluid Plan Calculator
About this app
Free veterinary dehydration calculator. Deficit plus maintenance plus losses over hours.
Veterinary Dehydration Fluid Plan Calculator Veterinary Dehydration Fluid Plan Calculator Replacement volume from percent dehydration, plus maintenance and ongoing losses. Not a mcg/kg/min converter. SpeciesSets default maintenance. Dog (60 mL/kg/day) Cat (50 mL/kg/day) Body weightkg Dehydrationpercent. Enter 8 for 8%, not 0.08. Replace deficit overhours Ongoing lossesmL over the same hours. Vomiting, diarrhea, drain output. Optional. Maintenance overridemL/kg/day. Leave blank for the species default. Calculate fluids Formula Deficit (mL) = % dehydration × BW(kg) × 10 because 8% of 10 kg = 0.8 kg = 800 mL. Maintenance (mL) = mL/kg/day × BW × (hours / 24) Total = deficit + maintenance + losses Rate (mL/hr) = total / hours Allometric option (not the default here): dog ~132 × BW^0.75 mL/day; cat ~80 × BW^0.75 mL/day. Shock boluses are a separate decision. References DiBartola SP, Bateman S. Introduction to fluid therapy. In: DiBartola SP, ed. Fluid, Electrolyte, and Acid-Base Disorders in Small Animal Practice. Deficit = % dehydration × BW × 10 (mL). Davis H, et al. 2013 AAHA/AAFP fluid therapy guidelines for dogs and cats. J Am Anim Hosp Assoc. Maintenance ranges and replacement o...
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Source
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
<title>Veterinary Dehydration Fluid Plan Calculator</title>
<meta name="description" content="Free veterinary dehydration calculator. Deficit plus maintenance plus losses over hours.">
<meta name="keywords" content="dehydration deficit, fluid therapy, veterinary fluids, replacement, maintenance, dog cat">
<style>
:root { --text:#1a1a1a; --muted:#4a4a4a; --line:#d6d6d6; --bg:#fff; --panel:#f6f6f6; }
html { -webkit-text-size-adjust:100%; text-size-adjust:100%; }
* { box-sizing:border-box; }
body {
margin:0;
font:16px/1.45 system-ui,-apple-system,sans-serif;
color:var(--text);
background:var(--bg);
overflow-x:hidden;
}
main {
max-width:720px;
margin:0 auto;
padding:24px 16px 48px;
padding-left:max(16px, env(safe-area-inset-left));
padding-right:max(16px, env(safe-area-inset-right));
}
html.in-viewer main {
padding-top:calc(4.25rem + env(safe-area-inset-top, 0px));
padding-right:calc(4.75rem + env(safe-area-inset-right, 0px));
padding-bottom:calc(6.5rem + env(safe-area-inset-bottom, 0px));
}
h1 { font-size:1.35rem; margin:0 0 0.35rem; }
h2 { font-size:1.05rem; margin:1.75rem 0 0.5rem; }
p, li { color:var(--text); }
.lede, .note, .disclaimer, label span { color:var(--muted); }
.lede, .disclaimer { font-size:0.95rem; }
label span { font-weight:400; font-size:0.85rem; }
form, .stack { display:grid; gap:14px; margin:1.25rem 0; }
fieldset {
border:1px solid var(--line);
border-radius:6px;
padding:12px;
display:grid;
gap:12px;
min-width:0;
}
legend { font-weight:600; padding:0 6px; }
label { display:grid; gap:4px; font-weight:600; }
.check { display:flex; align-items:center; gap:10px; font-weight:600; }
.check input { width:22px; height:22px; min-height:22px; flex:0 0 auto; }
input, select, textarea {
font:inherit;
font-size:16px;
min-height:44px;
padding:10px 12px;
border:1px solid var(--line);
border-radius:6px;
width:100%;
max-width:100%;
background:#fff;
}
button {
font:inherit;
font-size:16px;
font-weight:600;
width:100%;
min-height:48px;
padding:12px 14px;
border:0;
border-radius:6px;
background:#1a1a1a;
color:#fff;
cursor:pointer;
}
.result {
padding:16px;
background:var(--panel);
border:1px solid var(--line);
border-radius:6px;
}
.result strong { font-size:1.35rem; }
.parts { display:grid; gap:6px; margin-top:10px; font-size:0.95rem; }
pre.formula {
white-space:pre-wrap;
overflow-wrap:anywhere;
background:var(--panel);
border:1px solid var(--line);
border-radius:6px;
padding:12px;
font-size:0.9rem;
max-width:100%;
}
ol.refs { padding-left:1.25rem; }
ol.refs li { margin-bottom:0.6rem; }
a { color:inherit; }
.table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; max-width:100%; }
table { border-collapse:collapse; width:100%; font-size:0.9rem; }
th, td { border:1px solid var(--line); padding:8px; text-align:left; vertical-align:top; }
.muted { color:var(--muted); font-size:0.9rem; }
</style>
</head>
<body>
<main>
<h1>Veterinary Dehydration Fluid Plan Calculator</h1>
<p class="lede">Replacement volume from percent dehydration, plus maintenance and ongoing losses. Not a mcg/kg/min converter.</p>
<form id="calc-form">
<label>Species<span>Sets default maintenance.</span>
<select id="species">
<option value="60" selected>Dog (60 mL/kg/day)</option>
<option value="50">Cat (50 mL/kg/day)</option>
</select>
</label>
<label>Body weight<span>kg</span>
<input id="bw" type="number" min="0" step="any" inputmode="decimal" value="10">
</label>
<label>Dehydration<span>percent. Enter 8 for 8%, not 0.08.</span>
<input id="pct" type="number" min="0" max="15" step="any" inputmode="decimal" value="8">
</label>
<label>Replace deficit over<span>hours</span>
<input id="hours" type="number" min="1" step="any" inputmode="decimal" value="24">
</label>
<label>Ongoing losses<span>mL over the same hours. Vomiting, diarrhea, drain output. Optional.</span>
<input id="losses" type="number" min="0" step="any" inputmode="decimal" value="0">
</label>
<label>Maintenance override<span>mL/kg/day. Leave blank for the species default.</span>
<input id="maint" type="number" min="0" step="any" inputmode="decimal" placeholder="optional">
</label>
<button type="submit">Calculate fluids</button>
</form>
<div class="result" id="result" hidden></div>
<h2>Formula</h2>
<pre class="formula">Deficit (mL) = % dehydration × BW(kg) × 10
because 8% of 10 kg = 0.8 kg = 800 mL.
Maintenance (mL) = mL/kg/day × BW × (hours / 24)
Total = deficit + maintenance + losses
Rate (mL/hr) = total / hours
Allometric option (not the default here): dog ~132 × BW^0.75 mL/day;
cat ~80 × BW^0.75 mL/day. Shock boluses are a separate decision.</pre>
<h2>References</h2>
<ol class="refs">
<li>DiBartola SP, Bateman S. Introduction to fluid therapy. In: DiBartola SP, ed. <i>Fluid, Electrolyte, and Acid-Base Disorders in Small Animal Practice</i>. Deficit = % dehydration × BW × 10 (mL).</li>
<li>Davis H, et al. 2013 AAHA/AAFP fluid therapy guidelines for dogs and cats. <i>J Am Anim Hosp Assoc</i>. Maintenance ranges and replacement over time.</li>
</ol>
<p class="disclaimer">Veterinary education only. Not a prescription. Confirm doses and volumes with the attending clinician and current formularies before use.</p>
</main>
<script>
if (window.self !== window.top) {
document.documentElement.classList.add('in-viewer');
}
function num(id) {
var el = document.getElementById(id);
if (!el) return 0;
var value = parseFloat(el.value);
return isFinite(value) && value > 0 ? value : 0;
}
function raw(id) {
var el = document.getElementById(id);
if (!el) return NaN;
var value = parseFloat(el.value);
return isFinite(value) ? value : NaN;
}
function sel(id) {
var el = document.getElementById(id);
return el ? el.value : '';
}
function showResult(html) {
var el = document.getElementById('result');
el.hidden = false;
el.innerHTML = html;
}
function fmt(value, digits) {
if (!isFinite(value)) return '—';
return value.toFixed(digits);
}
document.getElementById('calc-form').addEventListener('submit', function (event) {
event.preventDefault();
var bw = num('bw'), pct = raw('pct'), hours = num('hours'), losses = raw('losses');
var maintPer = num('maint') || parseFloat(sel('species'));
if (!bw || !hours || !isFinite(pct) || pct < 0) {
showResult('<p>Enter weight, percent dehydration, and hours.</p>');
return;
}
losses = isFinite(losses) && losses > 0 ? losses : 0;
var deficit = pct * bw * 10;
var maint = maintPer * bw * (hours / 24);
var total = deficit + maint + losses;
var rate = total / hours;
showResult(
'<div>Fluid rate</div><strong>' + fmt(rate, 1) + '</strong><span> mL/hr</span>' +
'<div class="parts"><div>Deficit = ' + fmt(deficit, 0) + ' mL</div>' +
'<div>Maintenance over ' + fmt(hours, 1) + ' h = ' + fmt(maint, 0) + ' mL</div>' +
'<div>Losses = ' + fmt(losses, 0) + ' mL</div>' +
'<div>Total = ' + fmt(total, 0) + ' mL</div></div>' +
'<p class="note">Reassess hydration before the deficit window ends. Shock is not this plan.</p>'
);
});
</script>
</body>
</html>
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