Calcmedical
Fast medical calculators for medicine and surgery — eGFR, EDD, GCS, Apgar, burns, risk scores, and more. Runs in your browser.
Instant · Offline-capable formulas
52+ tools built for the ward, clinic, and OR pathway.
No accounts. Clear inputs, immediate results, cited formulas. Save favorites on this device.
Built for real medical workflows
Calcmedical is more than a list of widgets. Each calculator page explains when a score is used, how to interpret the output, what can go wrong, and which references support the equation. That structure helps trainees learn the tool and helps experienced clinicians double-check unit conversions and edge cases quickly.
Tools run locally in your browser, so ward Wi‑Fi drops and privacy policies that restrict cloud PHI are less of a barrier. Favorites stay on your device — no account required.
- 52+ calculators across medicine, surgery, OB, peds, and critical care
- Formula + interpretation on every page, with limitations and citations
- Specialty hubs to browse ED, nephrology, cardiology, and other focused sets
- Editorial standards and a clear medical disclaimer
High-use calculators
Start with the scores clinicians open most often. Save any calculator as a favorite to pin it here.
Peds Weight
Pediatric Weight Estimation
Estimate pediatric weight from age using APLS, Luscombe & Owens, and Best Guess formulas — plus infant and neonate modes.
eGFR
eGFR Calculator (CKD-EPI 2021)
Estimate glomerular filtration rate with the race-free CKD-EPI 2021 creatinine equation and view CKD stage banding.
EDD / EGA
EDD & EGA Calculator (from LMP)
Calculate estimated due date and current estimated gestational age from the first day of the last menstrual period.
BSA
Body Surface Area (BSA)
Calculate body surface area with Mosteller, DuBois & DuBois, Haycock, or Gehan & George formulas. Compare all methods side by side.
GCS
Glasgow Coma Scale (GCS)
Score eye, verbal, and motor responses for rapid neurologic assessment in trauma and critical care.
Burns / Parkland
Burns TBSA & Parkland Formula
Estimate percent TBSA with Rule of Nines and calculate Parkland crystalloid resuscitation volumes.
Browse by specialty
Medicine, surgery, obstetrics, critical care, and more — each hub links to focused calculators.
Emergency Medicine
Trauma, triage, and acute risk scores used in the ED.
Obstetrics & Gynecology
Pregnancy dating, labor scores, and perinatal tools.
Nephrology
Kidney function, electrolytes, and renal dosing helpers.
Critical Care
ICU severity scores and organ dysfunction tools.
Cardiology
Stroke prevention, ACS risk, and cardiac indices.
Surgery & Trauma
Burn resuscitation, surgical risk, and fluids.
Neurology
Coma scales and neurologic assessment scores.
Pediatrics
Neonatal and pediatric medical calculators.
Pulmonology
Respiratory severity and pneumonia scores.
Gastroenterology
Liver disease and GI bleed risk tools.
General Medicine
Everyday internal medicine calculators.
Educational decision-support only. Verify against primary literature and local protocols. See the medical disclaimer.