eGFR Calculator (CKD-EPI, MDRD and Schwartz)
EGFR Calculator (CKD-EPI, MDRD and Schwartz) works out Estimated GFR and KDIGO GFR category from Equation, Age and Sex. 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 eGFR Calculator (CKD-EPI, MDRD and Schwartz) 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 eGFR Calculator (CKD-EPI, MDRD and Schwartz)
Enter Equation, Age, Sex and Serum creatinine. Estimated GFR updates as you type, and “Use a worked example” loads checked figures you can adjust. 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.
CKD-EPI 2021 creatinine, 55-year-old woman, creatinine 0.9 mg/dL example
With Equation: ckd-epi-2021-creatinine, Age: 55, Sex: female, Serum creatinine: 0.9, the calculator returns Estimated GFR: 75.4988047, GFR category code: G2. This example is checked against an independent source in the test suite.
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 Equation, Age, Sex, Serum creatinine, Creatinine unit and Serum cystatin C.
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 the formula to calculate eGFR?
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.
What is the best calculator for eGFR?
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 Equation, Age and Sex and shown as Estimated GFR, KDIGO GFR category and GFR category code.
Can I calculate my GFR online?
It needs Equation, Age, Sex, Serum creatinine, Creatinine unit and Serum cystatin C. Nothing else is required, and the figures stay in your browser.
How to calculate eGFR at home?
The result gives Estimated GFR, KDIGO GFR category, GFR category code, Equation used, Serum creatinine used and Cystatin C used, each labelled with its unit so the figure can be read on its own.
What information do I need for the eGFR Calculator (CKD-EPI, MDRD and Schwartz)?
You need Equation, Age, Sex, Serum creatinine, Creatinine unit, Serum cystatin C, Height (children) and Height 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 eGFR Calculator (CKD-EPI, MDRD and Schwartz) 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.