All Medical Calculators

Calculate 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.

This calculator reproduces the conventional 0.8 albumin-adjusted calcium formula from measured total calcium and albumin. Current 2026 laboratory-medicine guidance recommends against routine reporting; the result is not measured ionized calcium.

Calculate the serum anion gap without potassium from sodium, chloride, and bicarbonate/total CO₂, with an optional separate Figge 2.5 albumin adjustment.

Calculate adult ideal body weight (IBW) with the Devine formula from height and optionally derive fixed adjusted body weight (AjBW40) from actual weight.

Calculate pediatric 4-2-1 and Holliday–Segar 100/50/20 maintenance fluid estimates, with a separate adult NICE routine-maintenance pathway.

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

Convert 11 common serum and plasma laboratory values between conventional and SI reporting units using analyte-specific factors.

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

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

Calculate A/G ratio from albumin with reported globulin or same-panel total protein; total-protein mode also shows calculated globulin with laboratory-specific interpretation limits.

Estimate adult race-free indexed glomerular filtration rate (eGFR) with 2021 CKD-EPI creatinine or combined creatinine–cystatin C and the 2012 cystatin C equation.

Calculate adult creatinine clearance (CrCl) with the Cockcroft–Gault equation using age, an explicit weight basis, serum creatinine, and the published sex coefficient.

Calculate corrected sodium from measured sodium and paired glucose using Katz 1.6 and Hillier overall 2.4, with glucose in mg/dL or mmol/L.

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 single-pool Kt/V and URR from paired pre/post BUN or urea, delivered time, ultrafiltration, and post-dialysis weight for one completed intermittent hemodialysis treatment.

Calculate spot urine total protein divided by same-specimen creatinine in mg/g, mg/mmol, and mg/mg, with interpretation boundaries distinct from ACR and measured 24-hour protein.

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 the conventional BUN/creatinine ratio from paired BUN or urea and creatinine values with US/SI unit normalization and neutral interpretation context.

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 FENa from urine and serum sodium and creatinine, with an optional separate FEUrea calculation from urine and serum urea or BUN plus the same creatinine record.

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.

Calculate an estimated positive bicarbonate deficit from measured and target bicarbonate, body weight, and an explicit distribution factor, with a canonical calculation audit and clear limits.

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.

Calculate conventional mean arterial pressure from one paired systolic and diastolic blood-pressure reading, with pulse pressure and a transparent formula audit.

Calculate Fick cardiac output from oxygen consumption and arterial–mixed-venous oxygen data, with optional cardiac index, stroke volume, SVI, and a complete calculation audit.

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 historical Duke Treadmill Score from standard Bruce equivalent exercise time, maximal ST-segment deviation, and the treadmill angina index.

Calculate the 2008 lipid-based Framingham Risk Score for 10-year General CVD in adults aged 30–74 without established cardiovascular disease.

Calculate the classic seven-item TIMI UA/NSTEMI score with a complete point audit and the original 14-day composite-event source bin.

Estimate GRACE 2.0 in-hospital and one-year ACS risk from the standard eight inputs, with the historical Classic GRACE 1.0 point score retained separately.

Calculate the classic HEART Score from clinician-assessed history, interpreted ECG, age, risk factors, and the initial same-assay troponin result.

Calculate the original HAS-BLED 0–9 bleeding-risk-factor score for adults with established atrial fibrillation, with exact criteria and current guideline limits.

Calculate Sampson/NIH LDL-C, non-HDL cholesterol and lipid ratios from one same-unit panel, with a labeled Friedewald comparison or reported-LDL provenance.

Calculate the A–a oxygen gradient from paired arterial PaO₂ and PaCO₂, FiO₂, and explicit pressure and R assumptions, with limited historical age-reference context.

Calculate all three classic Light criteria from paired serum and pleural-fluid protein and LDH values, with exact strict boundaries and optional pseudoexudate gradient context.

Calculate arterial PaO₂/FiO₂ ratio with explicit PaO₂ and FiO₂ units, FiO₂ reliability guidance, and ARDS definition limits.

Calculate the adult HFNC ROX Index from SpO₂, explicit FiO₂, and respiratory rate for a single assessment or a 2-, 6-, and 12-hour trend.

Calculate the original Celli 2004 BODE Index for clinically stable, established COPD from BMI, post-bronchodilator FEV₁ % predicted, mMRC dyspnea, and 6-minute walk distance.

Calculate cigarette pack-years across one or more smoking-history periods using cigarettes/day or standardized 20-cigarette packs/day 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 for age 12+ or reproduce historical MELD-Na and classic MELD with version-specific inputs and limits.

Calculate the modified Maddrey Discriminant Function from patient PT, the corresponding laboratory control PT, and total bilirubin, with exact threshold and current MELD/Lille context.

Calculate the adult Day-4 or Day-7 Lille score after corticosteroid therapy from baseline variables and bilirubin evolution, with exact formula provenance and a threshold-safe 0.45 audit.

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/ALT ratio from a same-panel pair reported in U/L, with absolute-enzyme, laboratory, and non-diagnostic context.

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 original pre-endoscopy Glasgow-Blatchford Score for acute upper GI bleeding from measured urea/BUN, hemoglobin, blood pressure, pulse, and explicit clinical findings.

Calculate the original Saltzman 2011 AIMS65 score from albumin, INR, altered mental status, systolic blood pressure, and age, with exact thresholds and historical mortality context.

Calculate the original 1996 Rockall Score with direct age, pulse, systolic pressure, comorbidity, and optional post-endoscopy diagnosis/stigmata inputs.

Calculate original and simplified Revised Geneva pretest-probability scores for adult suspected PE from direct age, pulse and explicit source findings.

Calculate the original six-component CPES score in nonhypotensive confirmed PE, with direct heart rate, external assessment statuses and a transparent component audit.

Check the original 11 Hestia outpatient PE exclusions with explicit assessments, exact Cockcroft–Gault CrCl and a transparent positive-criterion audit.

Calculate original Bova points and stage in normotensive confirmed acute PE from systolic pressure, heart rate, assay-classified troponin and documented RV dysfunction.

Apply standard or pregnancy-adapted YEARS to three clinical criteria and an explicitly labeled FEU D-dimer, including the pregnancy compression-ultrasound branch.

Calculate original PESI and independently validated simplified PESI after confirmed acute pulmonary embolism from direct vital signs and source-defined clinical factors.

Calculate the modified Wells score for suspected lower-extremity DVT, including exact paired calf measurements and current two-level interpretation.

Calculate the seven-criterion Wells score for pulmonary embolism with modified two-level and standard three-level classifications.

Check all eight PERC criteria for a low-probability adult suspected-PE assessment, with exact age, pulse, room-air oxygen, history, and examination boundaries.

Calculate the five CURB-65 criteria for adult community-acquired pneumonia using confusion, urea or BUN, respiratory rate, systolic and diastolic blood pressure, and age, with current NICE hospital risk groups.

Record standard Glasgow Coma Scale eye, verbal, and motor responses, calculate a complete score when all are testable, and preserve Not Testable components without a fabricated 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 Classic SOFA-1 score from raw clinical values across six organ systems 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 adult burn TBSA with the Rule of Nines, partial segment coverage, and optional separate historical Classic Parkland arithmetic.

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.

Calculate the current RCP NEWS2 adult acute-illness score from a complete observation set, including the correct SpO₂ scale, oxygen uplift, red-score components, and trigger category.

Calculate the classic Subbe 2001 adult Modified Early Warning Score from systolic blood pressure, heart rate, respiratory rate, temperature, and AVPU.

Look up the adult ICU RASS score chart or complete the original observation-to-stimulation 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 two-step PSI/PORT score and class for adult community-acquired pneumonia, with historical risk and site-of-care context.

Calculate the original 10-point Alvarado/MANTRELS score or the explicit Kalan 9-point modified score from symptoms, measured oral temperature, and WBC.

Calculate the source-exact 11-item Padua Prediction Score for hospitalized medical patients, with explicit definitions, a full point audit, and bleeding-risk limitations.

Calculate the 2005 Caprini surgical/perioperative VTE risk score from explicit patient and procedure factors, with complete point audit and separate source category frameworks.

Calculate the standard adult NIH Stroke Scale from all 15 scored entries, with a 0–42 total, permitted untestable-item documentation, and item-level results.

Look up and select the traditional five-grade Hunt and Hess clinical presentation scale for aneurysmal subarachnoid hemorrhage from one documented examination.

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/A1C between NGSP percent and IFCC mmol/mol, calculate eAG in mg/dL or mmol/L, or express representative eAG as an ADAG-equivalent estimated A1C.

Analyze stable nonpregnant adult TSH and Free T4, with optional Free T3, against the reporting laboratory’s own intervals and show the resulting descriptive biochemical pattern.

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 pediatric weight formulas by completed age, with exact substitutions, age boundaries, and current limitations.

Calculate a known pediatric mg/kg regimen from current measured weight, frequency, optional maxima, and entered concentration, or use one of three cited reference regimens.

Calculate the four-item Clinical Dehydration Scale and its 0–8 score and formal category, with item-level audit and pediatric applicability limits.

Enter one CBC/differential record to calculate available five-part white-cell absolute counts plus NLR, PLR, LMR, and SII with explicit source provenance.

Calculate adult RPI from relative reticulocyte percentage (RET%) and paired hematocrit using the fixed historical Hillman model and transparent maturation correction.

Calculate the Mentzer Index from same-CBC MCV and RBC count after microcytosis has been identified.

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