Medical Calculators15 free tools for kidney function, creatinine clearance, dosing calculations, pediatric dosing, corrected calcium, anion gap, QTc, blood sugar unit conversion, mean arterial pressure, blood pressure, pneumonia severity (CURB-65), the Glasgow Coma Scale, and the newborn APGAR score — always paired with a clear medical disclaimer and a cited scientific source.
Estimate your Glomerular Filtration Rate (eGFR) to check kidney function using the CKD-EPI 2021 equation.
Calculate Body Surface Area (BSA) for medication dosing using the Mosteller or Haycock (pediatric) formula.
Convert your HbA1c percentage into estimated average glucose (eAG) using the ADAG equation.
Check your blood pressure classification (systolic/diastolic) based on the standard AHA guidelines.
Calculate a total medication dose from a weight-based rate (mg/kg) already prescribed by your doctor or pharmacist.
Estimate a child's medication dose as a proportion of an adult dose, using Clark's Rule (weight-based) or Young's Rule (age-based).
Adjust a total calcium blood test result for low albumin levels using the standard Payne correction formula.
Calculate the anion gap from sodium, chloride, and bicarbonate levels, with an optional albumin-corrected value for patients with low albumin.
Convert blood glucose readings between mg/dL (used in the US) and mmol/L (used in most other countries).
Calculate Mean Arterial Pressure (MAP) from systolic and diastolic blood pressure readings.
Calculate the heart-rate corrected QT interval (QTc) from a measured QT interval and heart rate.
Calculate the Glasgow Coma Scale (GCS) score from eye-opening, verbal, and motor responses to assess level of consciousness.
Calculate the APGAR score for a newborn from Appearance, Pulse, Grimace, Activity, and Respiration ratings taken shortly after birth.
Estimate creatinine clearance (CrCl) using the Cockcroft-Gault equation from age, sex, weight, and serum creatinine — commonly used for renal drug dosing.
Calculate the CURB-65 score to estimate pneumonia severity and 30-day mortality risk from confusion, urea/BUN, respiratory rate, blood pressure, and age.