ConverterHub

eGFR Calculator (MDRD)

Estimate your eGFR (kidney function).

Result

59 mL/min/1.73m²

How it is calculated

The tool uses the four-variable MDRD equation: eGFR = 175 × Cr−1.154 × age−0.203, with serum creatinine Cr in mg/dL and age in years. For females the result is multiplied by 0.742. The answer is rounded to a whole number and shown in mL/min/1.73 m².

This equation does not use weight or race, and it is only an estimate from one blood value. Creatinine, age and the sex field must be filled in; creatinine must be above zero. If your lab reports creatinine in µmol/L, divide by 88.4 to get mg/dL first. It is an educational estimate, not a diagnosis; a clinician interprets kidney function.

Worked example

Female, 50 years, creatinine 1.0 mg/dL. Cr−1.154 = 1. Age−0.203 = 50−0.203 ≈ 0.452. So 175 × 1 × 0.452 ≈ 79.1. For females multiply by 0.742: 79.1 × 0.742 ≈ 58.7. Rounded, the tool shows 59 mL/min/1.73m².

Try this example →

Common mistakes

  • Entering creatinine in µmol/L; the formula expects mg/dL, so the value would be about 88 times too large and the eGFR near zero.
  • Leaving the sex on the default (male) for a female patient, which overstates the result by about 35%.
  • Treating a single result as a diagnosis: one reading can be changed by muscle mass, diet or dehydration.
  • Entering age in months or the date of birth instead of age in years.

About this calculator

This calculator estimates glomerular filtration rate (eGFR) from the MDRD (Modification of Diet in Renal Disease) equation, combining serum creatinine with age and sex to approximate how many milliliters of blood your kidneys filter per minute. It omits the race coefficient the original equation carried, following the 2021 NKF-ASN recommendation to remove race from eGFR reporting.

Nephrologists, primary care doctors, and lab technicians use eGFR to stage chronic kidney disease and track how kidney function changes over time, since a single creatinine value on its own says little without accounting for a person's age and muscle mass. It is also a routine number on basic metabolic panels that patients see on lab reports.

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