QuickMedCalc

Find the medical calculator that matches your task

Find a medical calculator

Search by calculator name, abbreviation, clinical category, or topic.

Search calculators

Featured tools

Featured calculators

Featured tooleGFREstimate adult race-free indexed glomerular filtration rate (eGFR) with 2021 CKD-EPI creatinine or combined creatinine–cystatin C and the 2012 cystatin C equation.Nephrology Featured toolMAPCalculate conventional mean arterial pressure from one paired systolic and diastolic blood-pressure reading, with pulse pressure and a transparent formula audit.Cardiology Featured toolBMI & BSACalculate adult body surface area (BSA) with an explicitly selected Mosteller, Du Bois, or Haycock formula and BMI from height and weight; add optional measurements for other named anthropometry models.General Medicine Featured toolASCVD RiskEstimate 10-year and age-eligible 30-year risk of a first ASCVD event with the corrected AHA PREVENT base equations.Cardiology Featured toolWells PECalculate the seven-criterion Wells score for pulmonary embolism with modified two-level and standard three-level classifications.Emergency Medicine & Critical Care Featured toolQTcCompare four fixed heart-rate correction formulas from a measured QT interval and representative heart rate, with ECG measurement and interpretation limits.Cardiology

Browse all calculators Sources & review processClinical calculators · No sign-in required

QuickMedCalc helps you find and use free medical calculators across clinical areas, including kidney function, cardiovascular risk, critical-care scores, body metrics, fluids, and laboratory calculations. When similar tools overlap, compare their task, inputs, returned measure, and limitations before opening one. Related calculations may be grouped when they use the same clinical record; individual calculators remain separate when the clinical model or task is genuinely distinct. Results are reference aids, not diagnoses or treatment instructions.

Choose by task, not just by calculator name

When similar tools use different measurements or return different estimates, compare the task, inputs, returned measure, and key distinction before opening a calculator. This is tool-selection context, not a diagnosis or treatment recommendation.

General Medicine Calculators

Anthropometry and reference weight

Full comparison guide

Choose between one shared adult measurement workspace and the separate historical Devine/AjBW40 weight workflow.

Adult Anthropometry Workspace

Use when: Calculate the supported adult size, surface-area, composition, ratio, and shape models from one measurement record.
Distinction: The workspace never combines distinct models into one score and withholds source comparability when a waist or hip protocol does not match.

Ideal Body Weight (IBW) & Adjusted Body Weight Calculator

Use when: Calculate the historical Devine reference weight and optionally fixed AjBW40 from the same height/weight record.
Distinction: This is a reference-weight workflow, not an anthropometry model vote, medication choice, dose, or personalized target.

Nephrology Calculators

Kidney-function estimates

Full comparison guide

These kidney-function estimates differ in biomarker inputs, indexing, weight use, and model purpose.

Adult eGFR Calculator

Use when: Estimate indexed GFR with the selected adult CKD-EPI creatinine, cystatin-C, or combined model.
Distinction: eGFR is indexed and model-specific; it is not Cockcroft–Gault clearance or dialysis adequacy.

Creatinine Clearance (CrCl) Calculator – Cockcroft–Gault

Use when: Calculate the historical adult Cockcroft–Gault creatinine-clearance estimate when that metric is required.
Distinction: The page does not automatically select a weight or produce a medication dose.

Cardiology Calculators

Long-term cardiovascular risk

Full comparison guide

Compare model identity before comparing percentages: population, endpoint, and horizon are part of the result's meaning.

ASCVD Risk Calculator – AHA PREVENT

Use when: Estimate the AHA PREVENT-ASCVD model output for its supported primary-prevention population.
Distinction: This is a current model-specific estimate and is not a Framingham endpoint or treatment threshold.

Framingham Risk Score Calculator (2008 General CVD)

Use when: Calculate the historical lipid-based Framingham General CVD model for adults 30–74 without established CVD at baseline.
Distinction: It is a historical model-specific estimate and is not ASCVD-only or a current statin decision.

Pulmonology Calculators

Gas exchange and oxygenation

Full comparison guide

These calculations use overlapping oxygen variables but are not interchangeable; select by the measurements and support context available.

A–a Gradient Calculator (Alveolar–Arterial Oxygen Gradient)

Use when: Calculate complete and simplified alveolar PAO₂, and add A–a gradient when paired arterial PaO₂ is available.
Distinction: PAO₂ is an equation output; the optional A–a calculation does not diagnose a cause.

P/F Ratio Calculator (PaO₂/FiO₂)

Use when: Calculate arterial PaO₂ relative to FiO₂ when paired arterial oxygen and FiO₂ are available.
Distinction: It is a ratio whose interpretation depends on support, position, time, and definition context.

Oxygenation Index (OI) Calculator

Use when: Calculate conventional OI during the supported invasive-ventilation state.
Distinction: OI uses ventilator MAP and is distinct from P/F, OSI, and arterial blood-pressure MAP.

Emergency Medicine & Critical Care Calculators

Pneumonia severity

Full comparison guide

Both tools require an established adult community-acquired pneumonia context, but their item sets and class systems differ.

CURB-65 Calculator for Pneumonia Severity

Use when: Calculate the five-item CURB-65 score for adults with clinically diagnosed community-acquired pneumonia.
Distinction: It is not interchangeable with PSI/PORT and does not prescribe disposition or treatment.

Pneumonia Severity Index (PSI/PORT) Calculator

Use when: Calculate the formal Fine PSI/PORT class for established adult community-acquired pneumonia.
Distinction: PSI has a different item structure and population context from CURB-65.

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 CalculatorsClinical toolsCommon 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 CalculatorsClinical toolsNephrology calculators for kidney-function estimation, acid-base arithmetic, fractional excretion, fluid and electrolyte estimates, urine protein assessment, and dialysis adequacy.Cardiology CalculatorsClinical toolsCardiology calculators for emergency chest-pain and acute coronary assessment, cardiovascular risk estimation, exercise-test scoring, lipid arithmetic, rhythm-related intervals, and pressure or Fick-flow hemodynamic measures.Pulmonology CalculatorsClinical toolsPulmonology calculators for stable-COPD multidimensional BODE scoring, paired pleural-fluid classification, ventilated-patient oxygenation, HFNC ROX response monitoring, smoking exposure, alveolar oxygen pressure, and A-a gradient assessment.Gastroenterology & Hepatology CalculatorsClinical calculatorsChoose among GBS, AIMS65 and staged Rockall for upper-GI-bleeding assessment; separate tools cover alcohol-associated hepatitis, liver disease scores, laboratory indices, and ascites arithmetic.Emergency Medicine & Critical Care CalculatorsClinical toolsEmergency and critical-care calculators for venous-thromboembolism, suspected appendicitis and other acute disease assessment, organ dysfunction, early warning and systemic response, neurologic and sedation assessment, hemodynamics, burns, and resuscitation support.Neurology CalculatorsClinical calculatorsNeurology calculators for structured stroke-deficit scoring with NIHSS, historical post-TIA risk-factor scoring with ABCD², and aneurysmal subarachnoid hemorrhage grading with Hunt-Hess.Endocrinology CalculatorsClinical calculatorsEndocrinology calculators for glycemic indices and thyroid-function assessment, with formula notes, assay context, and interpretation limits.Pediatrics CalculatorsClinical calculatorsPediatrics calculators for age-based weight estimation, selected medication arithmetic, and Clinical Dehydration Scale / dehydration assessment.Hematology CalculatorsClinical toolsHematology tools for one-record differential counts and ratios, red-cell production and microcytosis indices, and iron-study arithmetic.

How QuickMedCalc works

Methods & sources

Formulas and relevant unit handling remain visible where applicable. Methods link to applicable original publications, professional guidelines, official standards, or other authoritative sources. Population, method, interpretation, and important use limitations are documented where applicable.

Review scope

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. Source scope, implementation checks, limitations, and correction routes are documented alongside the applicable tool. QuickMedCalc is developed and maintained by an independent developer. Medical content is not independently reviewed by a physician.

Clinical use boundary

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.

Sources & review process About QuickMedCalc Read the disclaimer

Found a formula, unit, source, interpretation, or technical issue? Contact QuickMedCalc.