Everyday bedside calculations.

💧 IV Drip Rate gtt/min

(Volume × Drop factor) ÷ Time

🩸 IV Flow Rate mL/hr

Volume ÷ Time

⏱️ IV Infusion Time

Volume ÷ Flow rate

💊 Dosage (tablets / liquid)

(Desired ÷ Have) × Quantity

⚖️ Weight-Based Dose

Dose (mg/kg) × Weight (kg)

🫁 ABG Interpreter

Normal: pH 7.35–7.45 · PaCO₂ 35–45 · HCO₃⁻ 22–26

🧪 Creatinine Clearance mL/min

Cockcroft–Gault: [(140 − age) × weight × sex] ÷ (72 × SCr)

📐 Body Surface Area m²

Mosteller: √(height cm × weight kg ÷ 3600)

⚖️ Ideal Body Weight kg

Devine: 50 (♂) / 45.5 (♀) + 2.3 kg per inch over 5 ft

❤️ Mean Arterial Pressure mmHg

MAP = (SBP + 2 × DBP) ÷ 3

👶 Paediatric Maintenance Fluids mL/hr

Holliday–Segar 4-2-1: 4 mL/kg (first 10 kg) + 2 (next 10) + 1 (rest)

🤰 Estimated Due Date

Naegele's rule: LMP + 280 days (40 weeks)

🔥 Burns Fluid — Parkland mL / 24 h

4 mL × weight (kg) × % TBSA burned · half in first 8 h

🦴 Corrected Calcium mg/dL

Measured Ca + 0.8 × (4.0 − albumin)

⚗️ Anion Gap mEq/L

Na⁺ − (Cl⁻ + HCO₃⁻) · normal 3–11

🧠 Glasgow Coma Scale / 15

Eye + Verbal + Motor · 13–15 minor · 9–12 moderate · ≤8 severe

🫧 Oxygen Tank Duration time left

(Gauge PSI × cylinder factor) ÷ flow rate (L/min)

📏 BMI kg/m²

Weight ÷ Height²

🌡️ Temperature °F → °C

°C = (°F − 32) × 5/9

🏋️ Weight

kg = lb ÷ 2.205

🔄 Unit Converter

Mass

Volume

🩷 Next Period

First day of last period + cycle length

Estimate only — cycles naturally vary month to month.

🌸 Ovulation & Fertile Days

Ovulation ≈ next period − 14 days

Estimate only — not a contraceptive method.