Healthcare
Healthcare Calculators & Tools
Free health and clinical calculators with clear explanations, worked examples, and references. Explore the full collection below.
12 calculators available
Calculations run locally in your browser. No account is needed.
Adult BMI Calculator
Calculate body mass index from weight and height, with an explanation of its limitations.
Open calculatorBMR Calculator
Estimate calories burned at rest using the Mifflin–St Jeor equation. Includes the formula, example, and interpretation.
Open calculatorTDEE Calculator
Estimate daily maintenance calories from resting energy expenditure and an approximate activity level.
Open calculatorCalorie Deficit Calculator
Estimate an illustrative daily calorie target by subtracting a selected deficit from estimated maintenance needs.
Open calculatorPregnancy Due Date Calculator
Estimate a pregnancy due date from the first day of the last menstrual period, with an optional cycle-length adjustment.
Open calculatorA1c / eAG Calculator
Convert HbA1c percentage to estimated average glucose in mg/dL and mmol/L, or reverse the ADAG relationship.
Open calculatorBlood Pressure Categories
Classify an adult blood pressure reading using current AHA/ACC categories and learn why repeat measurement matters.
Open calculatorMAP Calculator
Estimate mean arterial pressure from systolic and diastolic blood pressure, with the formula and limits explained.
Open calculatorqSOFA Calculator
Calculate qSOFA from respiratory rate, systolic blood pressure, and altered mental status; review important screening limitations.
Open calculatorCIWA-Ar Calculator
Add ten clinician-assigned CIWA-Ar domain ratings and review the 0–67 score. Requires the official domain-specific scoring anchors.
Open calculatorAnion Gap Calculator
Calculate the serum anion gap from sodium, chloride and bicarbonate; optionally include potassium.
Open calculatoreGFR Calculator
Estimate adult kidney filtration using the race-free 2021 CKD-EPI serum creatinine equation from NIDDK.
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These tools are educational and do not replace medical advice, clinical judgment, or your institution's protocols. Items labeled “Review required” are available for evaluation but are not yet cleared for routine clinical use.