Skip to main content
🏥

Clinical & Veterinary Calculators

Fourteen advanced clinical calculators for veterinary professionals. Fluid rates, blood volume, emergency drug doses, CRI calculations, electrolyte correction — the tools that matter most in a clinical setting, available instantly.

35Free Tools
ICU &Emergency Ready
⚕️Vet Use Recommended

Every Calculator in This Category

These tools are designed for use by or under the supervision of qualified veterinary professionals. All formulas are sourced from published veterinary pharmacology and critical care references.

🔢

CRI Calculator for Dogs

Calculate constant rate infusion (CRI) amounts and rates for analgesics, sedatives, and vasopressors in canine patients.

🫁

Dog Anesthesia Bag Size Calculator

Calculate the correct rebreathing bag size for dogs during inhalant anaesthesia based on tidal volume.

🧪

Dog Anion Gap Calculator

Calculate the anion gap and albumin-corrected anion gap to identify the cause of metabolic acidosis in dogs.

🔬

Dog Bicarbonate Deficit Calculator

Calculate the bicarbonate deficit and sodium bicarbonate supplementation dose for metabolic acidosis in dogs.

🩸

Dog Blood Transfusion Calculator

Calculate the correct whole blood or pRBC volume required to reach the target PCV in a canine transfusion patient.

🩺

Dog Blood Volume Calculator

Calculate total circulating blood volume and haemorrhage thresholds for fluid therapy planning and surgical preparation.

📐

Dog Body Surface Area Calculator

Calculate canine body surface area (BSA) in m² for chemotherapy dosing and nutritional support calculations.

🫘

Dog BUN Creatinine Ratio Calculator

Calculate BUN:creatinine ratio to differentiate pre-renal, renal, and post-renal azotaemia in dogs.

🦴

Dog Corrected Calcium Calculator

Calculate corrected serum calcium in dogs with hypoalbuminaemia.

💧

Dog Dehydration Calculator

Calculate fluid deficit and replacement rate for dehydrated canine patients based on clinical dehydration percentage and bodyweight.

Dog Electrolyte Calculator

Calculate and interpret key electrolyte values — sodium, potassium, chloride, and calcium — for dogs in clinical settings.

🚨

Dog Emergency Drug Calculator

Generate a complete pre-calculated emergency drug sheet for a specific canine patient weight — for CPCR and critical care.

🫁

Dog Endotracheal Tube Size Calculator

Calculate the correct endotracheal tube diameter and confirm appropriate tube size for dogs by weight and breed type.

💉

Dog Fluid Bolus Calculator

Calculate correct fluid bolus volume and rate for dogs in hypovolaemic shock using incremental resuscitation.

💧

Dog Free Water Deficit Calculator

Calculate free water deficit in hypernatraemic dogs and guide safe correction rate.

🫘

Dog GFR Calculator

Estimate GFR and IRIS CKD stage in dogs using serum creatinine and SDMA.

❤️

Dog Heart Rate Calculator

Calculate normal heart rate ranges for dogs by age and size — and assess whether your dog's recorded heart rate is within normal limits.

💧

Dog IV Fluid Rate Calculator

Calculate maintenance, replacement, and shock bolus IV fluid rates with drops-per-minute for manual drip sets.

💉

Dog Maintenance Fluid Calculator

Calculate daily maintenance fluid requirements for hospitalised dogs based on body weight.

🔬

Dog MCHC Calculator

Calculate MCHC, MCV, and MCH from dog CBC values to classify anaemia type and detect hypochromasia or spherocytosis.

❤️

Dog Mean Electrical Axis Calculator

Calculate the mean electrical axis (MEA) from a dog ECG using leads I and aVF to detect axis deviation and conduction abnormalities.

🫁

Dog Minute Ventilation Calculator

Calculate minute ventilation and adjust ventilator settings to target normal EtCO2 in mechanically ventilated dogs.

🧫

Dog Osmolality Calculator

Calculate serum osmolality and identify osmol gap to detect unmeasured osmoles including ethylene glycol toxicity.

🫁

Dog Oxygen Content Calculator

Calculate arterial oxygen content (CaO2) from haemoglobin, oxygen saturation, and PaO2 for oxygen delivery assessment.

💨

Dog Oxygen Flow Rate Calculator

Calculate the correct fresh gas flow rate for dogs during inhalant anaesthesia based on body weight and breathing circuit type.

🔬

Dog Platelet Count Calculator

Assess platelet count severity and bleeding risk in dogs with thrombocytopaenia.

Dog Potassium Supplementation Calculator

Calculate the appropriate potassium supplementation rate for hypokalaemic dogs — with safe maximum infusion rate guidance.

🫘

Dog Protein Creatinine Ratio Calculator

Calculate urine protein:creatinine ratio (UPC) to quantify proteinuria and IRIS substage dogs with CKD.

🫁

Dog Respiratory Rate Calculator

Assess your dog's respiratory rate and determine whether it falls within normal limits — with guidance on when to seek veterinary attention.

🔬

Dog Reticulocyte Count Calculator

Calculate absolute reticulocyte count and classify anaemia as regenerative or non-regenerative in dogs.

🧂

Dog Sodium Deficit Calculator

Calculate the sodium deficit and correct replacement fluid volume for hyponatraemic dogs — with correction rate safety guidance.

💉

Dog Subcutaneous Fluid Calculator

Calculate correct subcutaneous fluid volume for dogs with CKD or mild dehydration requiring home fluid therapy.

🫁

Dog Tidal Volume Calculator

Calculate the correct tidal volume and ventilation parameters for mechanical ventilation in dogs based on body weight.

💧

Dog Urine Output Calculator

Calculate normal and abnormal urine output ranges for dogs based on body weight — for monitoring hydration and renal function.

❤️

Dog Vertebral Heart Score Calculator

Calculate Vertebral Heart Score (VHS) from thoracic radiograph measurements to assess cardiac size in dogs.

Clinical Calculators Built for Veterinary Practice

In a clinical setting, calculation errors can have serious consequences. These tools are designed to reduce cognitive load during high-pressure situations — whether that's an anaesthetic complication, a CPCR event, or managing a critically ill patient in ICU. Every formula is sourced from peer-reviewed veterinary references and standard critical care protocols.

They work best as a cross-check against manual calculation, not a replacement for clinical judgment. Experienced clinicians use calculators to verify — not to replace — their own reasoning. That's exactly how these tools are intended to be used.

🏥

Reduce Calculation Errors

Even experienced clinicians benefit from a second check during high-pressure moments.

How to Use These Calculators

1
🐕

Identify the Clinical Need

Fluid therapy? Drug dosing? Electrolyte correction? Select the calculator that matches your immediate need.

2
📝

Enter Patient Parameters

Input bodyweight, relevant laboratory values, and other patient-specific data as prompted.

3

Review and Cross-Check

Use the result to verify your manual calculation or as a starting point for discussion with your team.

4

Apply Clinical Judgment

These tools inform — they don't replace your assessment of the individual patient.

Why Dog Owners Trust Our Calculators

📚

Evidence-Based Formulas

All calculations sourced from BSAVA, Plumb's Veterinary Drug Handbook, and current critical care literature.

Instant in Emergency

Pre-calculated results in seconds when every second counts during CPCR or anaesthetic emergencies.

🔒

No Data Stored

Patient data entered into these calculators is never stored, transmitted, or retained.

🆓

Free for Clinicians

All 14 tools are permanently free — no hospital subscription required.

Frequently Asked Questions

Are these tools suitable for use in clinical practice?

They are designed as reference calculators for use by or under the supervision of qualified veterinary professionals. They should cross-check, not replace, clinical calculation.

What reference sources are the formulas based on?

BSAVA Manual of Canine and Feline Emergency and Critical Care, Plumb's Veterinary Drug Handbook, and current RECOVER CPR guidelines.

Is patient data stored when I use these calculators?

No. All calculations run in the browser. No patient data is transmitted to or stored on our servers.

Can veterinary nurses use these tools?

Yes — these tools are useful for any qualified veterinary professional involved in patient care and drug preparation.

Clinical Tools Available Right Now

14 free veterinary calculators. No login, no subscription, no wait.

Browse All Categories →