GFR Kidney Function Calculator

Estimate glomerular filtration rate from age, sex and serum creatinine. This is a screening estimate and not a diagnosis.

Estimate Your GFR

Important: Kidney function estimates should be interpreted by a qualified healthcare professional, particularly when creatinine is changing rapidly or kidney disease is suspected.

Maintained by Live Fitness Check. Last updated: August 9, 2026. How we test our calculators .

About This Calculator

GFR Kidney Function Calculator estimates adult glomerular filtration rate from serum creatinine, age and sex. It is designed to give a quick, understandable estimate from age, sex and serum creatinine so the result can be used as a starting point for learning, tracking or a more informed discussion.

Methodology

Inputs used: Age, sex and serum creatinine.
Calculation approach: The calculator uses the race-free 2021 CKD-EPI creatinine equation to estimate eGFR in mL/min/1.73 m².
Interpretation: Results are presented as an estimate and should be read together with the limitations described below.

Sources

National Kidney Foundation — CKD-EPI Creatinine Equation (2021): https://www.kidney.org/ckd-epi-creatinine-equation-2021
National Kidney Foundation — eGFR Calculator: https://www.kidney.org/professionals/gfr_calculator

Disclaimer

This calculator is for general informational and educational use. EGFR is an estimate and chronic kidney disease is not diagnosed from one isolated eGFR value. Do not use the result as a diagnosis, emergency assessment, or a replacement for advice from an appropriately qualified health professional when medical decisions are involved.

Frequently Asked Questions

What does the GFR Kidney Function Calculator estimate?

Estimates adult glomerular filtration rate from serum creatinine, age and sex.

How is this result calculated?

The calculator uses the race-free 2021 CKD-EPI creatinine equation to estimate eGFR in mL/min/1.73 m². The calculation uses age, sex and serum creatinine.

How should I use the result?

EGFR is an estimate and chronic kidney disease is not diagnosed from one isolated eGFR value. Use the number as an estimate and consider professional advice when the result may affect health, treatment, pregnancy, nutrition, exercise safety or another important decision.

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