eGFR Calculator

Estimate glomerular filtration rate from age, sex, and serum creatinine. Free online calculator with formulas and step-by-step solutions.

Key formula

2021 CKD-EPI creatinine equation

About this tool

eGFR is a kidney-function estimate built from serum creatinine, age, and sex. This page is useful because it shows users how a lab value becomes an interpreted estimate rather than appearing as a mysterious score with no visible structure.

How to use this calculator

1. Enter realistic personal values and double-check the chosen unit system before calculating.
2. Use the result as a planning estimate, not as a diagnosis or guaranteed outcome.
3. Compare the output with your goal, context, and any relevant professional guidance.
4. Review the steps to understand how the estimate was produced from your inputs.