Question
Is this the same as a lab-reported eGFR?
It aims to be comparable for creatinine-based estimates, but labs can differ in rounding, reporting conventions, and which equation they use.
Fitness
Use OmniCalc's GFR calculator to estimate kidney filtration from serum creatinine, age, and sex.
GFR calculator
Use serum creatinine, age, and sex to estimate glomerular filtration rate (eGFR) and see the corresponding kidney-function stage range.
OmniCalc uses the 2021 CKD-EPI creatinine equation, then groups the estimate into standard GFR stage bands for a quick interpretation.
Why this result matters
A kidney-function estimate calculator that turns serum creatinine into an eGFR estimate and stage-band interpretation. Use the tool above to enter a few clear inputs and get a practical answer you can use right away.
This GFR calculator estimates eGFR from serum creatinine, age, and sex using the 2021 CKD-EPI creatinine equation. It helps turn a creatinine result into a more interpretable kidney-function estimate and shows the standard GFR stage band for quick context.
Formula and method
The calculator uses the 2021 CKD-EPI creatinine equation without a race coefficient, then maps the estimate to standard GFR stage bands.
Example
If someone enters age 52, female, and serum creatinine 1.1 mg/dL, the calculator estimates eGFR and shows the corresponding stage band.
FAQ
Short answers to the questions people often ask before or after using the tool.
Question
It aims to be comparable for creatinine-based estimates, but labs can differ in rounding, reporting conventions, and which equation they use.
Question
No. A single low estimate is not a diagnosis. Persistent low eGFR and the wider clinical picture should be reviewed with a clinician.
Question
Some labs report creatinine in µmol/L instead of mg/dL. OmniCalc converts the value internally before applying the equation.
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