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QuickMedCalc
Medical calculators with formulas, sources, and limitations
Browse 89 free medical calculators across 10 clinical categories. Each tool shows the calculation, unit handling, source links, and important limitations. Results are reference aids, not diagnoses or treatment instructions.
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- 89
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- 10
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Search by calculator name, abbreviation, clinical category, or topic.
Featured calculators
6 featuredAdult eGFR CalculatorNephrologyMean Arterial Pressure (MAP) CalculatorCardiologyAdult BMI Calculator (Body Mass Index)General MedicineAHA PREVENT-ASCVD Risk CalculatorCardiologyWells Score Calculator for PEEmergency Medicine & Critical CareQTc Calculator – Bazett, Fridericia, Framingham & HodgesCardiology
Browse by clinical category
Choose a clinical area to browse its focused calculator collection, or open the full directory to search across every tool.
General Medicine Calculators20 calculatorsCommon medical math tools used across specialties, including BMI, body-shape indices, serum protein ratios, estimated fat-free mass, blood volume, fluids, and lab arithmetic.Nephrology Calculators14 calculatorsNephrology calculators for kidney-function estimation, acid-base arithmetic, fractional excretion, fluid and electrolyte estimates, urine protein assessment, and dialysis adequacy.Cardiology Calculators12 calculatorsCardiology calculators for cardiovascular risk estimation, lipid arithmetic, rhythm-related intervals, acute coronary syndrome risk, and hemodynamic measures.Pulmonology Calculators5 calculatorsPulmonology calculators for ventilated-patient oxygenation, smoking exposure, alveolar oxygen pressure, and A-a gradient assessment.Gastroenterology & Hepatology Calculators5 calculatorsGastroenterology and hepatology calculators for liver disease scores and laboratory reference arithmetic, including MELD/MELD-Na, Child-Pugh, APRI, SAAG, and the De Ritis ratio.Emergency Medicine & Critical Care Calculators13 calculatorsEmergency and critical-care calculators for acute disease-specific assessment, organ dysfunction, sepsis and systemic response, neurologic and sedation assessment, hemodynamics, burns, and resuscitation support.Neurology Calculators3 calculatorsNeurology calculators for stroke severity, transient ischemic attack risk, subarachnoid hemorrhage grading, and consciousness assessment.Endocrinology Calculators3 calculatorsEndocrinology calculators for glycemic indices and thyroid-function assessment, with formula notes, assay context, and interpretation limits.Pediatrics Calculators3 calculatorsPediatrics calculators for age- and weight-related estimates, weight-based medication arithmetic, dehydration assessment, and common child-focused formula checks.Hematology Calculators11 calculatorsHematology calculators for derived absolute leukocyte counts and laboratory reference measures, including AMC, AEC, ANC, RPI, TSAT, NLR, PLR, LMR, and SII.
What each calculator page includes
Source-linked content
Pages link original papers, professional guidelines, official standards, or other applicable authoritative sources.
Interpretation and limitations
Pages describe intended populations, important limits, omitted factors, and misuse boundaries instead of supplying only a number.
Arithmetic and boundary checks
Automated tests check formulas, unit conversions, valid input, boundaries, and safe display behavior; testing does not replace clinical validation.
How medical content is built
- 1. Identify sources. Original formulas, current guidelines, or authoritative standards are identified.
- 2. Check scope. Formula details, populations, units, thresholds, and exceptions are reviewed.
- 3. Implement and test. Calculations receive regression, boundary, and display checks.
- 4. Publish limits and corrections. Sources, updates, limitations, and correction routes are shown on the site.
QuickMedCalc is developed and maintained by an independent developer. Medical content is not independently reviewed by a physician.
Medical formulas, scoring rules, thresholds, intended populations, limitations, and explanatory claims are based on cited official guidance, original publications, regulatory materials, and other authoritative sources as applicable.
Use calculator results in context
A numeric result cannot diagnose a condition or automatically select medication, dose, treatment, or referral. Use it alongside history, examination, laboratory trends, imaging, applicable guidelines, and professional judgment. Some formulas only apply to defined populations or clinical states. In an emergency, do not rely on this website for self-management.
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Report a formula or unit issue, an outdated source or guideline, misleading interpretation, a technical problem, or a suggestion for a new calculator.
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