female, age 50, creatinine 0.9 mg/dL
- Interpretation range
- Mildly decreased range
- Equation
- CKD-EPI 2021 creatinine
- Race coefficient
- Not used
GFR Calculator
Use this free GFR calculator to estimate adult eGFR from age, sex, and serum creatinine using the 2021 CKD-EPI equation.
Research-based formula Estimate limits shown Examples included Private history
Formula steps
- Use age, sex, and standardized serum creatinine.
- Apply the 2021 CKD-EPI creatinine equation.
- Interpret eGFR with urine tests, history, and clinician guidance.
How to use the gfr calculator
- Enter the requested measurements, dates, lab values, or workout details.
- Check that the units and formula assumptions match what the tool is asking for.
- Press the calculate button to see the answer, supporting metrics, and formula steps.
- Read the estimate with the health disclaimer in mind, then copy the result if you need it for notes.
Common uses
Estimate adult eGFR from a creatinine lab value.
Use the 2021 CKD-EPI race-free equation.
See a broad eGFR interpretation range.
Prepare questions for a clinician about kidney labs.
Examples
eGFR estimate
eGFR estimate
eGFR estimate
Frequently asked questions
Quick answers about formulas, inputs, estimate limits, professional guidance, examples, and private in-browser history.
What can I use the GFR Calculator for?
Use it for quick educational estimates, planning, comparison, and trend checks. Health and fitness results should be interpreted with context, not as a diagnosis.
How does the GFR Calculator calculate the result?
The calculator uses the 2021 CKD-EPI creatinine equation with age, sex, and serum creatinine. It does not use a race coefficient.
Is this medical advice?
No. This page provides an educational estimate only. Talk with a qualified health professional before making medical, pregnancy, nutrition, medication, or safety decisions.
Are my health inputs private?
Yes. The calculator runs in your browser tab. Recent answers stay only on the page while you use it and are not sent to a server.