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Clinical calculators
Free clinical calculators for veterinarians — doses and CRIs, fluids, transfusions, toxicities, IRIS staging, electrolytes, acid–base, nutrition and more. Formulas and thresholds are shown with their sources.
Dosing
- Body Surface Area (BSA) Calculator for Dogs & Cats — mg/m² DosingBody surface area in m² from body weight, and the total dose for drugs dosed in mg/m² (e.g.…
- CRI Calculator for Dogs & Cats (Constant-Rate Infusion)Constant-rate infusion maths in mcg/kg/min, mcg/kg/h, mg/kg/h or mg/kg/day — either the drug to add to a fluid…
- Tablet Dose Calculator for Dogs & CatsHow many tablets (whole, halves or quarters) give the dose you want — and the mg/kg the patient…
- Veterinary Dose Calculator (mg/kg to mL)Convert a dose in mg/kg, mcg/kg, IU/kg or mL/kg into the total dose and the volume to draw…
Fluids
- Fluid Therapy Calculator for Dogs & Cats (Maintenance + Dehydration)Maintenance fluid requirement, dehydration deficit and the hourly rate to replace it — using the AAHA/AAFP allometric formulas…
- IV Drip Rate Calculator (Drops per Minute)Turn an infusion rate in mL/h into drops per minute and seconds per drop for any giving set.
Emergency & critical care
- A–a Gradient Calculator (Alveolar Gas Equation) for Dogs & CatsAlveolar oxygen (PAO₂), the alveolar–arterial oxygen gradient and the PaO₂/FiO₂ ratio from an arterial blood gas.
- Blood Transfusion Volume Calculator for Dogs & Cats (pRBC)Volume of packed red blood cells needed to reach a target PCV, from the recipient's PCV, the unit's…
- Modified Glasgow Coma Scale (MGCS) Calculator for DogsScore motor activity, brainstem reflexes and level of consciousness (1–6 each) for a total of 3–18 in head…
- Plasma Transfusion Dose Calculator for Dogs & CatsVolume range of plasma for coagulopathies by species and body weight.
- Urine Output Calculator (mL/kg/h)Urine production in mL/kg/h from the volume collected, body weight and collection time — for in-patients on fluids…
Toxicology
- Chocolate Toxicity Calculator for Dogs (Theobromine + Caffeine mg/kg)Methylxanthine dose (theobromine + caffeine) in mg/kg from the type and amount of chocolate eaten, with the expected…
- Ibuprofen Toxicity Calculator for Dogs & CatsIbuprofen dose in mg/kg after an acute ingestion and the expected effects at that dose.
- Paracetamol (Acetaminophen) Toxicity Calculator for Dogs & CatsParacetamol (acetaminophen) dose in mg/kg and what to expect in cats and dogs, with the antidote dose of…
- Xylitol Toxicity Calculator for DogsXylitol dose in mg/kg from the amount on the product label, compared with the thresholds for hypoglycaemia and…
Electrolytes & acid–base
- Anion Gap Calculator for Dogs & CatsAnion gap from sodium, potassium, chloride and bicarbonate.
- Free Water Deficit Calculator (Hypernatraemia) for Dogs & CatsFree water deficit in litres from the current and normal sodium, and the minimum time to correct at…
- Potassium Supplementation Calculator (KCl in IV Fluids)How much potassium to add per litre of fluid for the patient's serum potassium, and a check of…
- Sodium Bicarbonate Dose Calculator (Base Deficit) for Dogs & CatsBicarbonate deficit in mEq from the base deficit — or with the conservative formula from measured HCO₃⁻ —…
Nephrology
Nutrition
Reproduction
Conversions
- Dilution Calculator (C1V1 = C2V2) — Dextrose & Other SolutionsHow much stock solution to add to make a final volume at a lower concentration — for example…
- Lab Unit Converter: SI ↔ Conventional (Glucose, Creatinine, BUN, Calcium…)Convert biochemistry results between SI and conventional units — glucose, creatinine, BUN/urea, calcium, phosphorus, magnesium, bilirubin, cholesterol, triglycerides,…
- Veterinary Unit Converter (kg/lb, °C/°F, %, mg/mcg)Everyday clinical conversions: body weight, temperature, % solutions to mg/mL, mg ↔ mcg and ounces to grams.
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