All medical calculators

Calculate adult BMI from metric or US customary inputs, view the CDC adult screening category, and see the formula-derived weight span for BMI 18.5–24.9 at the entered height with non-diagnostic interpretation limits.

Reproduce the conventional 0.8 albumin-adjusted total-calcium estimate in conventional or SI units, with an input-specific calculation audit and current guidance against routine reporting.

Calculate serum anion gap from sodium, chloride, and bicarbonate or total CO₂ using the formula without potassium, with an input-specific calculation audit.

Calculate the adult Devine ideal body weight reference from height and the formula’s male or female coefficient, with kg/lb output and an input-specific formula breakdown.

Calculate pediatric 4-2-1 and Holliday–Segar 100/50/20 maintenance-water estimates or adult NICE daily and hourly reference ranges.

Calculate estimated body surface area from height and weight using the Mosteller, Du Bois, or Haycock formula.

Calculate whole-drop gravity IV rate and mathematical flow rate from volume, time, and tubing drop factor.

Convert 10 common serum and plasma laboratory values between conventional and SI reporting units using analyte-specific factors.

Calculate fixed adult AjBW40 dosing-weight arithmetic from total body weight and either an existing or optional Devine ideal body weight, with drug- and protocol-specific limitations.

Estimate reference blood volume with the adult Nadler or Lemmens formula, or perform arithmetic using an explicitly supplied external mL/kg protocol coefficient.

Estimate adult whole-body fat percentage from height and waist circumference using the published Woolcott–Bergman RFM equation.

Calculate adult waist-to-hip ratio from standardized waist and hip circumferences in metric or US units.

Estimate adult fat-free mass with the Boer equation and derive FFMI from height using metric or US units.

Estimate stool osmotic gap from stool sodium and potassium using the conventional assumed 290 mOsm/kg model, with collection and interpretation limits.

Calculate the Thomas 2013 geometric Body Roundness Index from height and waist circumference in centimeters or inches, with measurement and interpretation limits.

Calculate WHtR from waist circumference and standing height in centimeters, total inches, or feet/inches, with NICE applicability and measurement limits.

Calculate raw ABSI with an optional explicitly selected NHANES reference z-score, exact unit handling, and protocol-specific measurement limits.

Calculate the original Bergman BAI from height and hip circumference, with DXA validation limits and no automatic body-fat category.

Calculate A/G ratio from albumin plus reported globulin or same-panel total protein, with separate units and a complete laboratory arithmetic audit.

Calculate the serum protein gap from total protein and albumin with independent units and a complete arithmetic audit.

Estimate adult race-free indexed glomerular filtration rate (eGFR) with 2021 CKD-EPI creatinine, 2012 cystatin C, or 2021 combined equations.

Estimate adult Cockcroft–Gault creatinine clearance in mL/min from an explicit weight basis, without automatic weight selection or a dosing recommendation.

Compare Katz 1.6 and Hillier overall 2.4 hyperglycemia-adjusted sodium estimates from measured sodium and paired glucose in mg/dL or mmol/L, without selecting a primary model.

Calculate serum osmolality and effective osmolality (tonicity), with optional measured osmolality, osmolal gap, and separate ethanol assumptions; no toxic-alcohol or HHS diagnosis.

Calculate adult Daugirdas II single-pool Kt/V and URR for one completed intermittent hemodialysis treatment using paired sampling and actual delivered time; no adequacy classification or prescription.

Calculate a same-specimen spot urine total protein-to-creatinine ratio in mg/mg, mg/g, and mg/mmol; not ACR, 24-hour protein, or a diagnosis.

Calculate a signed sodium-only Figge 2.5 albumin-adjusted anion gap from same-specimen or paired chemistry and albumin in g/dL or g/L, with no universal interval, diagnosis, delta ratio, or treatment output.

Calculate measured urine output for one completed collection interval as average mL/hr and average mL/kg/hr using protocol-selected weight, without AKI diagnosis, stage, or treatment output.

Calculate a same-specimen or clinically paired conventional BUN-to-creatinine ratio after exact normalization of BUN mg/dL or urea mmol/L and creatinine mg/dL or µmol/L, without diagnostic or treatment output.

Estimate a static positive free water deficit for hypernatremia when current sodium is >145 mmol/L or mEq/L, using an explicitly selected lower target, kg or lb weight, and an explicit TBW coefficient, with estimated TBW and results in L and mL—not an infusion volume or treatment output.

Calculate fractional excretion of sodium from paired urine and serum sodium plus independently normalized urine and serum creatinine in mg/dL or µmol/L, returning a percentage without a universal cutoff, AKI-cause classification, or treatment output.

Calculate paired urine and serum FEUrea (FEUN) after independent exact normalization of BUN mg/dL or whole urea mmol/L and urine/serum creatinine in mg/dL or µmol/L, with no AKI-cause or treatment output.

Calculate the one-decimal signed urine anion gap from sodium, potassium, and chloride in the same urine specimen using mmol/L or mEq/L, without treating UAG as direct urine ammonium or a universal positive/negative diagnosis.

Estimate a static positive bicarbonate deficit in mEq from submitted bicarbonate, an externally selected higher target, kg or lb weight, and an explicit distribution factor; not blood-gas base deficit, a sodium bicarbonate dose, product volume, or treatment output.

Compare four fixed heart-rate correction formulas from a measured QT interval and representative heart rate, with ECG measurement and interpretation limits.

Estimate 10-year and age-eligible 30-year risk of a first ASCVD event with the corrected AHA PREVENT base equations.

Estimate conventional mean arterial pressure from one systolic and diastolic blood-pressure reading using the one-third pulse-pressure formula.

Calculate the classic 2010 CHA₂DS₂-VASc risk-factor point total for adults with clinician-established atrial fibrillation or atrial flutter.

Calculate the original six-item Lee RCRI point score and class for adult preoperative assessment before noncardiac surgery, with source-specific limitations.

Calculate the D’Agostino 2008 lipid-based 10-year Framingham general CVD estimate for eligible adults aged 30–74 without established cardiovascular disease.

Calculate the classic 2003 GRACE bedside point score for in-hospital mortality in adult acute coronary syndrome.

Calculate the original 2010 HAS-BLED 0–9 bleeding-risk-factor score for adults with established atrial fibrillation.

Reproduce the traditional 1972 Friedewald LDL-C estimate from one same-unit lipid panel, with exact triglyceride boundaries and current-method limitations.

Calculate non-HDL cholesterol from total cholesterol minus HDL-C from the same lipid panel, with unit-safe arithmetic and guideline-context limitations.

Calculate the unitless total cholesterol-to-HDL-C ratio from one same-panel lipid profile, with exact arithmetic and current-guideline limitations.

Calculate the unitless LDL-C-to-HDL-C ratio from one same-panel lipid profile, with method-aware arithmetic and current-guideline limitations.

Calculate estimated alveolar oxygen tension and the alveolar–arterial oxygen gradient from FiO₂, arterial PaO₂ and PaCO₂, barometric pressure, and R.

Estimate alveolar oxygen tension with the complete alveolar gas equation and compare the common simplified clinical approximation.

Calculate arterial PaO₂/FiO₂ ratio with explicit PaO₂ and FiO₂ units and FiO₂-source limitations.

Calculate standardized cigarette pack-years from calendar-day average cigarettes or 20-cigarette packs and years smoked.

Calculate conventional Oxygenation Index from matched FiO₂, ventilator mean airway pressure, and arterial PaO₂ during invasive mechanical ventilation.

Calculate current OPTN MELD 3.0 or reproduce historical MELD-Na and classic MELD using version-specific inputs, bounds and limitations.

Calculate the standard five-domain Child-Turcotte-Pugh score and class for established cirrhosis using bilirubin, albumin, INR or PT prolongation, ascites, and encephalopathy.

Calculate the signed SAAG from same-day serum and ascitic-fluid albumin, with independent units and non-diagnostic interpretation limits.

Calculate the unitless AST-to-ALT ratio from a same-panel pair reported in U/L, with laboratory and non-diagnostic limitations.

Calculate APRI from same-assessment AST, the reporting laboratory’s AST upper limit, and platelet count, with current HCV/HBV context and non-diagnostic limits.

Calculate the weighted Wells PE pretest-probability score with two-level and three-level classifications.

Calculate the five-item CURB-65 score for adults with clinically diagnosed community-acquired pneumonia using confusion, urea or BUN, respiratory rate, blood pressure and age.

Record the standard adult Glasgow Coma Scale eye, verbal, and motor responses, including documented not-testable components without creating a misleading total.

Reproduce the 1985 adult general-ICU APACHE II severity score from worst first-24-hour physiology, age and defined chronic-health points.

Calculate the original 1996 Classic SOFA-1 score from the worst eligible values in one defined 24-hour window, with an optional comparable-baseline change.

Count the classic 1992 adult systemic inflammatory response criteria from submitted measurements, without diagnosing sepsis.

Estimate qualifying adult burn total body surface area with classic Rule of Nines anterior and posterior segments.

Calculate the classic adult Parkland 4 mL/kg/%TBSA first-24-hour crystalloid estimate and its fixed 50/50 formula allocation.

Calculate traditional adult Shock Index from paired heart rate and systolic blood pressure.

Calculate the original adult Sepsis-3 qSOFA prognostic prompt from respiratory rate, altered mentation, and systolic blood pressure.

Describe adult observed agitation or sedation with the original RASS assessment sequence.

Record the five-item adult BISAP early prognostic score from the first 24 hours of an established acute-pancreatitis hospitalization.

Calculate the formal Fine 1997 two-step adult PSI/PORT class for established community-acquired pneumonia, with complete item and guideline limitations.

Calculate the standard adult NIH Stroke Scale from all 15 scored entries, with permitted untestable-item documentation and complete item-level results.

Assign the standard five-grade Hunt–Hess clinical category for aneurysmal subarachnoid hemorrhage from the documented presentation, with exact criteria and neutral limitations.

Calculate the standard 0–7 ABCD² score from age, initial blood pressure, clinical features, symptom duration and diabetes, with component-level results and modern triage limitations.

Convert HbA1c between NGSP percent and IFCC mmol/mol units and estimate average glucose in mg/dL and mmol/L using the ADAG equation, with diagnostic and assay limitations.

Organize stable nonpregnant adult TSH, Free T4 and optional Free T3 against the reporting laboratory’s reference intervals, with submitted pattern details and discordance limitations.

Calculate the original HOMA1-IR index from paired fasting insulin and glucose, with glucose-unit normalization, assay limitations and no universal diagnostic cutoff.

Compare historical revised-APLS and Luscombe–Owens age-only weight estimates from completed age, with source-priority, accuracy and clinical-use limitations.

Calculate source-specific pediatric reference-dose arithmetic for selected amoxicillin, ibuprofen and intravenous acetaminophen regimens using current measured weight and explicit dose limits.

Calculate the four-item Clinical Dehydration Scale for children 1–60 completed months with acute gastroenteritis, with formal categories, validation scope and red-flag limitations.

Calculate ANC from same-CBC WBC, segmented neutrophils, and separately reported bands with explicit units and neutral limits.

Calculate the historical adult Hillman RPI from a relative reticulocyte percentage and paired hematocrit using the fixed 45% standard and source-specific maturation bands.

Calculate the historical Mentzer Index from same-CBC MCV and RBC count as a non-diagnostic screening aid for microcytosis.

Calculate NLR from matched absolute counts or percentages with exact decimal arithmetic and neutral interpretation limits.

Reproduce the Miller 1983 source-cohort ESR upper-limit estimate for ages 20–65 using one explicit historical formula, with laboratory-method limitations.

Calculate platelet-to-lymphocyte ratio from matched absolute blood counts with exact unit normalization and nonspecific interpretation limits.

Calculate the Hu 2014 SII from matched absolute platelet, neutrophil, and lymphocyte counts with exact unit normalization.

Calculate TSAT from same-assessment serum iron and laboratory-reported TIBC with exact unit normalization.

Calculate LMR from same-CBC absolute lymphocyte and monocyte counts with exact unit normalization.

Calculate absolute monocyte count from a same-CBC total WBC and reported monocyte percentage, with exact unit normalization.

Calculate absolute eosinophil count from a same-CBC total WBC and reported eosinophil percentage, with exact unit normalization.