Free Healthcare Calculators
Reference calculators for students, clinicians and anyone curious about common health formulas.
These tools are for education and general information only. They are not medical advice and must not be used to make diagnosis, dosing or treatment decisions.
Ready to use
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Free, private and in your browser, like everything else here.
BMR Calculator
Estimate basal metabolic rate with common equations.
Body Surface Area Calculator
Estimate body surface area with standard formulas.
Due Date Calculator
Estimate a pregnancy due date from the last menstrual period.
IV Drip Rate Calculator
Calculate drops per minute and mL per hour for education.
Doctors and Healthcare: common questions
Can I use these calculators for patient care?
No. They are for education and general reference only. Clinical decisions should follow your local protocols and the judgment of a qualified professional.
Is health information I enter stored?
No. Calculations run in your browser and nothing you enter is sent to our servers.