Health calculators

Screening tools, body metrics, and calorie math you can trust.

BMI, body fat, BMR, and other health screening tools — clearly labelled as informational rather than diagnostic, with citations for each formula.

Calculators

277

Topics: All Body Metrics (56) Calories (14)

Health

Pediatric Maintenance Fluid (4-2-1) Calculator

Compute the hourly maintenance IV fluid rate for a child using the Holliday-Segar 4-2-1 rule: 4 mL/kg/h for the first 10...

basic

1,194 3.9 1 min

Health / Calories

BMR Calculator

Estimate basal metabolic rate using the Mifflin-St Jeor equation.

basic

23,812 5.0 1 min

Health

Delta Gap & Delta Ratio Calculator

Compute the delta gap and delta ratio from the anion gap and serum bicarbonate to detect mixed acid-base disorders. Δ-ra...

basic

22,700 4.4 1 min

Health

GOLD COPD Spirometry Grade Calculator

Classifies COPD severity using the GOLD classification based on post-bronchodilator FEV1 % predicted: GOLD 1 (≥80%), GOL...

basic

21,324 3.9 1 min

Health

Opioid Morphine Milligram Equivalent (MME) Dose Calculator

Compute the daily morphine milligram equivalent (MME) for an opioid prescription — the standard CDC measure of opioid do...

basic

18,982 3.8 1 min

Health

Dialysis URR (Urea Reduction Ratio) Calculator

Compute the urea reduction ratio (URR) — the simplest haemodialysis adequacy index — from the patient's pre- and post-di...

basic

18,655 4.9 1 min

Health

BISAP Score for Acute Pancreatitis Calculator

Compute the BISAP (Bedside Index of Severity in Acute Pancreatitis) score from 5 binary criteria available within 24 h o...

basic

18,336 4.9 1 min

Health

Base Excess from ABG Calculator

Estimate the standard base excess (SBE) from arterial pH and HCO₃ using a Siggaard-Andersen-style approximation: BE ≈ 0....

basic

15,659 4.3 1 min

Health

CIWA-Ar Alcohol-Withdrawal Severity Score Calculator

Compute the Clinical Institute Withdrawal Assessment for Alcohol — Revised (CIWA-Ar). 10 weighted sub-scores (each 0-7 e...

basic

14,896 4.7 1 min

Health

Cardiac Index from Cardiac Output and Body-Surface Area Calculator

Compute the cardiac index — the bedside hemodynamic measure that normalises cardiac output to body size. CI = CO (L/min)...

basic

14,159 4.6 1 min

Health

Bishop Score for Cervical Favorability Calculator

Compute the modified Bishop score used to predict whether labour induction will be successful: sum of cervical dilation,...

basic

11,103 3.9 1 min

Health

Pediatric Weight Estimate from Age Calculator

Estimate a child's weight from age using the APLS formula (in kg): for ages 1-5 → 2·age + 8; for ages 6-12 → 3·age + 7....

basic

10,719 4.6 1 min

Health

FIB-4 Liver Fibrosis Index Calculator

Compute the FIB-4 index — a non-invasive estimate of advanced liver fibrosis combining age, AST, ALT and platelet count:...

basic

5,613 4.5 1 min

Health

FEV1 / FVC Ratio Calculator

Compute the FEV₁/FVC ratio from spirometry. A post-bronchodilator ratio below 0.70 (or below the lower limit of normal)...

basic

5,566 4.5 1 min

Health

Maximum Heart Rate (Gellish Formula) Calculator

Estimate age-predicted maximum heart rate via the Gellish equation HR_max = 207 − 0.7 · age, derived from a longitudinal...

basic

4,648 4.5 1 min

Health

Ganzoni Iron Deficit Calculator

Compute total iron deficit (mg) using the Ganzoni equation: deficit = weight · (Hb_target − Hb_current) · 2.4 + iron-sto...

basic

4,027 4.0 1 min

Health

Arterial Oxygen Content (CaO₂) Calculator

Compute the arterial oxygen content CaO₂ — the total volume of O₂ carried per 100 mL (dL) of arterial blood — from haemo...

basic

2,912 4.3 1 min

Health

Glasgow-Blatchford Upper-GI Bleeding Score Calculator

Compute the Glasgow-Blatchford bleeding score for upper-GI bleed risk stratification. Score = 0 reliably identifies pati...

basic

270 3.9 1 min

Health

SAAG Serum-Ascites Albumin Gradient Calculator

Compute the serum-ascites albumin gradient (SAAG): SAAG = serum_albumin − ascites_albumin (g/dL). SAAG ≥ 1.1 g/dL strong...

basic

22,464 4.5 1 min

Health

Braden Scale Pressure Injury Risk Score Calculator

Compute the Braden Scale score for predicting pressure injury (decubitus ulcer) risk. Six subscales each scored 1-3 or 1...

basic

21,145 4.1 1 min

Health

Respiratory Exchange Ratio Calculator

Compute the respiratory exchange ratio (RER) from the volumes of CO₂ produced and O₂ consumed during a metabolic test, a...

basic

21,068 4.1 1 min

Health

Oxygen Delivery (DO₂) from Cardiac Output and CaO₂ Calculator

Calculates systemic oxygen delivery DO₂ = CO × CaO₂ × 10, where CO is cardiac output (L/min), CaO₂ = (1.34 × Hb × SaO₂/1...

basic

20,665 3.8 1 min

Health

Transferrin Saturation Calculator

Compute the transferrin saturation (TSAT) from serum iron and total iron-binding capacity (TIBC) — a routine marker for...

basic

19,924 5.0 1 min

Health

Winters' Formula Respiratory Compensation Calculator

Compute the expected pCO₂ in a patient with primary metabolic acidosis using Winters' formula: pCO₂ = 1.5 · HCO₃ + 8 ± 2...

basic

19,882 4.9 1 min

Showing 49 to 72 of 277 results

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BMI, body fat, BMR, and other health screening tools — clearly labelled as informational rather than diagnostic, with citations for each formula.

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Health calculators

Pediatric Maintenance Fluid (4-2-1) Calculator

BMR Calculator

Delta Gap & Delta Ratio Calculator

GOLD COPD Spirometry Grade Calculator

Opioid Morphine Milligram Equivalent (MME) Dose Calculator

Dialysis URR (Urea Reduction Ratio) Calculator

BISAP Score for Acute Pancreatitis Calculator

Base Excess from ABG Calculator

CIWA-Ar Alcohol-Withdrawal Severity Score Calculator

Cardiac Index from Cardiac Output and Body-Surface Area Calculator

Bishop Score for Cervical Favorability Calculator

Pediatric Weight Estimate from Age Calculator

FIB-4 Liver Fibrosis Index Calculator

FEV1 / FVC Ratio Calculator

Maximum Heart Rate (Gellish Formula) Calculator

Ganzoni Iron Deficit Calculator

Arterial Oxygen Content (CaO₂) Calculator

Glasgow-Blatchford Upper-GI Bleeding Score Calculator

SAAG Serum-Ascites Albumin Gradient Calculator

Braden Scale Pressure Injury Risk Score Calculator

Respiratory Exchange Ratio Calculator

Oxygen Delivery (DO₂) from Cardiac Output and CaO₂ Calculator

Transferrin Saturation Calculator

Winters' Formula Respiratory Compensation Calculator