Estimate kidney filtration fast: a serum creatinine value plus your age and sex can produce an eGFR using the 2021 CKD‑EPI formula. This free tool shows input limits so you know if the result applies to you.
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Step 1 — Gather your numbers
Get a recent serum creatinine from your lab report, plus your age and sex. Confirm the creatinine units on the report so the calculator reads correctly. Ready to plug them into the tool?
Step 2 — Enter values in the calculator
Type your creatinine, age and sex into the labeled fields and watch for any input warnings. The tool only uses what you enter, so correct data matters. Curious how those inputs become an eGFR?
Step 3 — How the calculation works
The calculator applies the 2021 CKD‑EPI equation to estimate adult eGFR from your inputs. It outputs a number, not a diagnosis, and doesn’t infer missing data. Want help interpreting that number?
Read your result and know its limits
Place the eGFR value in context: lab variability, clinical factors and calculator limits affect accuracy. Use the tool’s labels to judge relevance and consult a clinician for decisions. Find out when to act.
Read the full eGFR guide
Step-by-step calculator use, clear explanation of the CKD‑EPI 2021 method, accuracy notes, FAQs and related tools to help you interpret results.