Gfr Kidney Foundation Calculator
Kidney Foundation GFR Calculator works out Estimated GFR and KDIGO GFR category from Age, Sex and Serum creatinine. The default figures on this page give estimated GFR of 75.5 mL/min/1.73m^2; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
5 steps
- Scr / k = 0.9000 / 0.7 = 1.285714
- min(Scr/k, 1)^-0.241 = 1.000000
- max(Scr/k, 1)^-1.200 = 0.739651
- 0.9938^55 = 0.710305, female factor 1.012
- eGFR = 75.50 mL/min/1.73 m^2, KDIGO category G2
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
5 sources
What the Kidney Foundation GFR Calculator calculates
Estimates glomerular filtration rate in mL/min/1.73 m² by the CKD-EPI 2021 creatinine, creatinine-cystatin C, CKD-EPI 2012 cystatin C, IDMS MDRD or bedside Schwartz equation, with the KDIGO GFR category.
How to use this Kidney Foundation GFR Calculator
Enter Age, Sex, Serum creatinine and Creatinine unit. Estimated GFR updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Estimated GFR, KDIGO GFR category and GFR category code.
The method follows NIDDK - eGFR equations for adults (CKD-EPI 2021 creatinine, CKD-EPI 2021 creatinine-cystatin C, CKD-EPI 2012 cystatin C), National Kidney Foundation - CKD-EPI creatinine equation (2021), NIDDK - Estimating glomerular filtration rate, IDMS-traceable MDRD Study equation, Schwartz GJ et al. New equations to estimate GFR in children with CKD. J Am Soc Nephrol 2009;20(3):629-637 and KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease - GFR categories G1-G5.
What you can compare
Change one input at a time to see how it affects Estimated GFR, KDIGO GFR category and GFR category code. The inputs you can vary are Age, Sex, Serum creatinine and Creatinine unit.
Understanding Estimated GFR, KDIGO GFR category and GFR category code
Educational estimate only. eGFR is an estimate from a single laboratory value and does not by itself establish or exclude chronic kidney disease; interpretation belongs to a clinician.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What is a normal GFR for a 70 year old?
Estimates glomerular filtration rate in mL/min/1.73 m² by the CKD-EPI 2021 creatinine, creatinine-cystatin C, CKD-EPI 2012 cystatin C, IDMS MDRD or bedside Schwartz equation, with the KDIGO GFR category. On this page it is computed from Age, Sex and Serum creatinine and shown as Estimated GFR, KDIGO GFR category and GFR category code.
Can I calculate my GFR online?
Estimates glomerular filtration rate in mL/min/1.73 m² by the CKD-EPI 2021 creatinine, creatinine-cystatin C, CKD-EPI 2012 cystatin C, IDMS MDRD or bedside Schwartz equation, with the KDIGO GFR category. Open “How this is worked out” beside the result to see each step for your own figures.
Will drinking more water increase my GFR?
Estimates glomerular filtration rate in mL/min/1.73 m² by the CKD-EPI 2021 creatinine, creatinine-cystatin C, CKD-EPI 2012 cystatin C, IDMS MDRD or bedside Schwartz equation, with the KDIGO GFR category. On the figures this page opens with — age 55 years and serum creatinine 0.9 — the estimated GFR is 75.5 mL/min/1.73m². Put your own figures in their place and the working updates beside the result.
What is the normal range for GFR according to the National Kidney Foundation?
On the figures this page opens with — age 55 years and serum creatinine 0.9 — the estimated GFR is 75.5 mL/min/1.73m². No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What information do I need for the Kidney Foundation GFR Calculator?
You need Age, Sex, Serum creatinine and Creatinine unit. The page opens with default figures that give estimated GFR of 75.5 mL/min/1.73m^2, so you can see the scale before entering your own.
What does this Kidney Foundation GFR Calculator show?
It shows Estimated GFR, KDIGO GFR category, GFR category code, Equation used, Serum creatinine used and Cystatin C used, with the working and any warnings for your entries.