GFR
Calculate glomerular filtration rate for kidney function
These calculators provide general information only and are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How to use GFR
- 1Enter your serum creatinine, age, and sex (and race coefficient if the older equation uses it).
- 2Choose the equation, such as CKD-EPI or MDRD.
- 3Read your estimated GFR and the corresponding kidney stage.
What eGFR tells you
CKD-EPI and MDRD equations estimate GFR from creatinine, age, sex (and historically race)eGFR estimates how well your kidneys filter waste; lower numbers mean reduced kidney function, grouped into stages 1 to 5.
It is a screening estimate from a blood test, not a diagnosis; only a clinician can interpret it alongside other tests.
Frequently asked questions
What is a normal eGFR?
Around 90 or above is generally normal for adults, though it naturally declines a little with age.
Why does race appear in some formulas?
Older equations included a race coefficient, but current guidelines favour race-free versions to reduce bias.
Should I worry about one low result?
A single value can vary; your clinician looks at trends and other tests before drawing conclusions.