Vet Tech Calculators

The A-a gradient assesses lung gas exchange efficiency.

Formula: [FiO2 * (Patm - 47) - (PaCO2 / 0.8)] - PaO2

Calculates the volume (mL) of anesthesia drug to draw up based on weight and selected drug’s default dose and concentration.

Formula: [Weight (kg) × Dose (mg/kg)] / Concentration (mg/mL) = Volume (mL)

Evaluates acid-base imbalances.

Formula: Na⁺ - (Cl⁻ + HCO₃⁻) = Anion Gap (mEq/L)

Interprets acid-base status.

Basic interpretation provided (e.g., acidosis, alkalosis).

Determines bicarbonate needed to correct metabolic acidosis.

Formula: 0.3 × Weight (kg) × (Target HCO₃⁻ - Current HCO₃⁻)

Estimates BSA for drug dosing.

Formula: BSA (m²) = K × (Weight (kg))^(2/3) / 100, K = 10.1 (dogs), 10.0 (cats)

Calculates the final concentration when mixing two fluids.

Formula: [(Vol1 × Conc1) + (Vol2 × Conc2)] / (Vol1 + Vol2)

Determines infusion rate for constant drug delivery.

Formula: [Weight (kg) × Dose (μg/kg/min)] / [Concentration (mg/mL) × 1000] × 60

Calculates the volume of drug to administer.

Formula: [Weight (kg) × Dose (mg/kg)] / Concentration (mg/mL)

Calculates IV drip rate for fluid administration.

Formula: [Volume (mL) × Drop Factor (drops/mL)] / [Time (h) × 60]

Normalizes echocardiographic measurements.

Formula: LVID / Weight^(1/3)

Estimates daily energy needs.

Formula: RER = 70 × (Weight (kg))^0.75; Active = 1.5 × RER

Estimates fluid deficit for horses.

Formula: Weight (kg) × Dehydration (%) × 10

Calculates fluid rate including deficit and maintenance.

Formula: [Deficit (Weight × % × 10) + Maintenance (50 mL/kg/day)] / Hours

Assesses kidney function.

Formula: (Urine Na⁺ / Plasma Na⁺) ÷ (Urine Creat / Plasma Creat) × 100

Estimates daily fluid needs.

Formula: 50 mL/kg/day

Estimates plasma osmolality.

Formula: 2 × Na⁺ + (Glucose / 18) + (BUN / 2.8)

Calculates the concentration of a solution.

Formula: (Solute (g) / Volume (mL)) × 100

Converts between Celsius and Fahrenheit.

Formulas: C to F = (C × 9/5) + 32; F to C = (F - 32) × 5/9

Estimates blood volume needed for transfusion.

Formula: Weight (kg) × 70 × (Target HCT - Current HCT) / Donor HCT (assume 40%)

Converts between kilograms and pounds.

Formulas: kg to lb = kg × 2.20462; lb to kg = lb / 2.20462

Calculates IV fluid administration rate.

Formula: Weight (kg) × Rate (mL/kg/h)

Estimates due date based on breeding date and species.

Average gestation: Dog (63 days), Cat (65 days), Horse (340 days)