Medical Calculation Formula
We have given complete list of medical calculation formula.
1. BMI
BMI = Weight (kg) / Height (m)²
2. BSA – Mosteller formula
BSA = √[(Height(cm) × Weight(kg)) / 3600]
3. IV Drip Rate
gtt/min = (Volume × Drop Factor) / Time (min)
4. Infusion Rate
mL/hr = Total Volume / Time (hr)
5. Dosage Calculations
Dose = mg/kg × Weight(kg)
6. Pediatric Fluid Requirements (4:2:1 Rule)
4 mL/kg/hr (first 10 kg), 2 mL/kg/hr (next 10 kg), 1 mL/kg/hr (>20 kg)
7. % Drug Solution
1% = 1g/100mL = 10 mg/mL
8. Creatinine Clearance
CrCl = [(140 – age) × weight (kg)] / (72 × serum creatinine) × 0.85 (if female)
9. eGFR
MDRD or CKD-EPI formulas (based on lab)
10. Anion Gap
AG = Na⁺ – (Cl⁻ + HCO₃⁻)
11. Corrected Sodium (Hyperglycemia)
Corrected Na = Measured Na + [1.6 × ((Glucose – 100)/100)]
12. Corrected Calcium
Corrected Ca = Measured Ca + 0.8 × (4 – albumin)
13. Alveolar Gas Equation
PAO₂ = FiO₂ × (Patm – PH₂O) – PaCO₂ / RQ
14. A-a Gradient
A–a gradient = PAO₂ – PaO₂
15. P/F Ratio
P/F Ratio = PaO₂ / FiO₂
16. MAP
MAP = (SBP + 2 × DBP) / 3
17. Pulse Pressure
PP = SBP – DBP
18. Cardiac Output / Index
CO = HR × SV | CI = CO / BSA
19. Heart Rate (ECG)
HR = 300 / Number of large squares between R-R
20. APGAR Score
Appearance, Pulse, Grimace, Activity, Respiration (0–10)
21. Weight-Based Drug Dosing
Dose = mg/kg × Weight
22. Estimated Weight by Age
1–10 yrs: (Age × 2) + 8
23. BP Percentiles
Use age, sex, and height to assess percentile
24. Naegele’s Rule
EDD = LMP + 1 year – 3 months + 7 days
25. Bishop Score
Assesses cervical readiness for labor (0–13)
26. Contraction Frequency
Count contractions in a 10-minute window
27. GCS
Eye (4) + Verbal (5) + Motor (6) = 3–15
28. Shock Index
SI = HR / SBP
29. Wells Score
DVT/PE clinical prediction (score-based)
30. CHA₂DS₂-VASc Score
Stroke risk in AF (0–9)
31. Insulin Dose
Based on sliding scale or carb ratio
32. HbA1c to eAG
eAG = (28.7 × HbA1c) – 46.7
33. Insulin-Carb Ratio
ICR = 500 / TDD
34. Sodium Correction
Use formulas for hypo/hypernatremia adjustment
35. Potassium Replacement
10 mEq K⁺ ≈ 0.1 mEq/L serum increase
36. Osmolality
Osm = 2 × Na + Glucose/18 + BUN/2.8