How to Use Estimated Glomerular Filtration Rate (eGFR) Calculator
The Estimated Glomerular Filtration Rate (eGFR) Calculator is a kidney-function estimator that converts serum creatinine into an indexed filtration-rate estimate. The calculator handles the common creatinine unit conversion first, then applies the selected CKD-EPI-style factors to estimate filtration.
Enter serum creatinine in mg/dL or µmol/L, age, sex, and the race coefficient option shown by the calculator. Check the creatinine unit carefully. A value in µmol/L entered as mg/dL would create a dramatically incorrect eGFR.
The result shows eGFR in mL/min/1.73m², the G category, and the creatinine value after unit conversion. Creatinine and age must be positive. The result also reports the creatinine value used in mg/dL so unit conversion can be audited.
Formula & Theory - Estimated Glomerular Filtration Rate (eGFR) Calculator
The Estimated Glomerular Filtration Rate (eGFR) Calculator uses this formula or scoring rule:
eGFR = 141 × min(Scr/k, 1)^a × max(Scr/k, 1)^-1.209 × 0.993^Age × sex factor × race factoreGFR equations estimate average kidney filtration and are less reliable in acute kidney injury, pregnancy, extremes of muscle mass, or unusual diets. Current clinical practice may use different CKD-EPI versions, so match the calculator to the intended reference.
eGFR is best interpreted with trends, urine albumin, clinical context, and the equation version used by the lab. Race-coefficient handling differs across modern guidelines and institutions.
Use Cases for Estimated Glomerular Filtration Rate (eGFR) Calculator
The Estimated Glomerular Filtration Rate (eGFR) Calculator is especially useful for:
- converting µmol/L creatinine to an eGFR estimate
- teaching CKD G category thresholds
- checking how age changes eGFR for the same creatinine
- reviewing lab values before discussing them with a clinician
Use this calculator for education or rough comparison with a lab report. For medication dosing, CKD staging, or diagnosis, rely on the clinical laboratory method and professional review.