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

Free Testosterone from Total T and SHBG (Vermeulen) Calculator

Compute the free testosterone fraction from total testosterone (nmol/L), sex-hormone-binding globulin (nmol/L), and seru...

basic

18,006 4.2 1 min

Health

Ejection Fraction from Ventricular Volumes Calculator

Compute the left-ventricular ejection fraction (EF) and stroke volume (SV) from echo / MRI volumes: SV = EDV − ESV; EF %...

basic

15,447 4.4 1 min

Health

Bicarbonate Deficit Calculator

Estimate the bicarbonate deficit needed to correct a metabolic acidosis to a target HCO₃ of 24 mEq/L: deficit = 0.5 · we...

basic

15,304 4.3 1 min

Health

Alveolar Gas Equation (PAO₂) Calculator

Compute the alveolar partial pressure of oxygen PAO₂ from the alveolar gas equation: PAO₂ = (P_atm − P_H₂O) · FiO₂ − PaC...

basic

14,804 3.8 1 min

Health

CHADS₂ Stroke Risk Calculator

Compute the CHADS₂ score for stroke risk in patients with non-valvular atrial fibrillation, by tallying clinical risk fa...

basic

14,311 4.1 1 min

Health

A-a Oxygen Gradient (Alveolar-Arterial) Calculator

Compute the alveolar-arterial oxygen gradient (A-a gradient). Alveolar PO₂ from the alveolar-gas equation: PAO₂ = FiO₂ ·...

basic

13,461 4.6 1 min

Health

Ranson's Criteria (On Admission) for Pancreatitis Calculator

Compute the Ranson's Criteria score using the 5 admission predictors of severe acute pancreatitis: age > 55 yr, WBC > 16...

basic

12,050 4.0 1 min

Health

Rockall Score for Upper-GI Bleed Calculator

Compute the clinical and full Rockall scores for risk stratification after acute upper-GI haemorrhage. Clinical Rockall...

basic

11,777 4.2 1 min

Health

LDL-C via Martin-Hopkins Equation Calculator

Compute LDL-cholesterol via the Martin-Hopkins equation, which uses an adjustable TG:VLDL ratio (≈ 5.0 - 6.5) instead of...

basic

11,419 4.1 1 min

Health

Light's Criteria for Pleural Effusion Calculator

Apply Light's criteria to a pleural effusion: it is an exudate if any of (1) pleural protein / serum protein > 0.5, (2)...

basic

9,169 4.0 1 min

Health

Plasma Volume (Hakim Formula) Calculator

Estimate the patient's plasma volume in millilitres using the Hakim formula widely used in therapeutic plasma exchange:...

basic

8,748 3.8 1 min

Health / Calories

Calorie Calculator (TDEE)

Estimate daily calorie needs (TDEE) from BMR and an activity multiplier.

basic

536 4.4 1 min

Health

Estimated Blood Loss from Hemoglobin Drop Calculator

Estimate operative or post-operative blood loss in mL from the change in haemoglobin and the patient's estimated blood v...

basic

21,374 3.9 1 min

Health

PESI Pulmonary Embolism Severity Index Calculator

Compute the PESI (Pulmonary Embolism Severity Index) score for risk-stratifying acute PE patients. Base score = age in y...

basic

20,210 4.4 1 min

Health

Revised Geneva Score for Pulmonary Embolism Calculator

Compute the revised Geneva score — a fully objective clinical decision rule for assessing pre-test probability of pulmon...

basic

19,853 4.2 1 min

Health

Urine Anion Gap Calculator

Compute the urine anion gap from urine sodium, potassium, and chloride. A positive UAG in the setting of a hyperchloraem...

basic

18,359 4.8 1 min

Health

Pediatric Acetaminophen Dose Calculator

Compute the weight-based acetaminophen dose for a child using the standard 10-15 mg/kg per dose, every 4-6 hours, with a...

basic

14,852 4.8 1 min

Health

Morse Fall Scale Total Score Calculator

Calculates the Morse Fall Scale (MFS) score from six domains: history of falls, secondary diagnosis, ambulatory aid, IV/...

basic

11,881 4.2 1 min

Health

Cardiac Output via the Fick Principle Calculator

Compute cardiac output using the Fick principle: CO = VO₂ / (CaO₂ − CvO₂). VO₂ is oxygen consumption (mL/min); CaO₂ and...

basic

8,976 4.7 1 min

Health

NEWS2 (National Early Warning Score 2) Calculator

Compute the National Early Warning Score 2 (NEWS2) used by the NHS for early detection of clinical deterioration. Adds w...

basic

8,481 4.1 1 min

Health

Hyperglycaemia-Corrected Serum Sodium (Katz Formula) Calculator

Correct measured serum sodium for the dilutional effect of hyperglycaemia using the Katz formula: Na_corrected = Na_meas...

basic

6,173 4.2 1 min

Health

BSA Haycock Calculator

Compute body surface area using the Haycock formula — favoured for paediatric patients: BSA (m²) = 0.024265 · h^0.3964 ·...

basic

4,099 4.4 1 min

Health

Surgical Apgar Score from EBL, Lowest HR, and Lowest MAP Calculator

Compute the Surgical Apgar Score (Gawande et al. 2007), a 10-point post-operative risk-of-major-complication score from...

basic

3,327 4.0 1 min

Health

Glucose Infusion Rate (GIR) Calculator

Compute the glucose infusion rate in mg/kg/min from the IV fluid rate (mL/h), dextrose concentration (% w/v), and patien...

basic

3,271 4.2 1 min

Showing 73 to 96 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

Free Testosterone from Total T and SHBG (Vermeulen) Calculator

Ejection Fraction from Ventricular Volumes Calculator

Bicarbonate Deficit Calculator

Alveolar Gas Equation (PAO₂) Calculator

CHADS₂ Stroke Risk Calculator

A-a Oxygen Gradient (Alveolar-Arterial) Calculator

Ranson's Criteria (On Admission) for Pancreatitis Calculator

Rockall Score for Upper-GI Bleed Calculator

LDL-C via Martin-Hopkins Equation Calculator

Light's Criteria for Pleural Effusion Calculator

Plasma Volume (Hakim Formula) Calculator

Calorie Calculator (TDEE)

Estimated Blood Loss from Hemoglobin Drop Calculator

PESI Pulmonary Embolism Severity Index Calculator

Revised Geneva Score for Pulmonary Embolism Calculator

Urine Anion Gap Calculator

Pediatric Acetaminophen Dose Calculator

Morse Fall Scale Total Score Calculator

Cardiac Output via the Fick Principle Calculator

NEWS2 (National Early Warning Score 2) Calculator

Hyperglycaemia-Corrected Serum Sodium (Katz Formula) Calculator

BSA Haycock Calculator

Surgical Apgar Score from EBL, Lowest HR, and Lowest MAP Calculator

Glucose Infusion Rate (GIR) Calculator