Worked example: GFR Calculator
Male age 50 creatinine 0.9. This fixed reference example shows one complete scenario; the interactive results above use your current inputs.
View the example inputs
- Adult age
- 50 years
- Equation sex profile
- Male
- Serum creatinine unit
- mg/dL
- Standardized serum creatinine
- 0.9 mg/dL
- Serum creatinine is stable
- Yes, stable adult measurement
| Calculated quantity | Example result |
|---|---|
| Estimated GFR (2021 CKD-EPI creatinine) | 104 mL/min/1.73 m² |
Understand the inputs, method and result
Interpret this calculation in its stated scope
Estimate adult eGFR with the race-free 2021 CKD-EPI creatinine equation.
SCr uses mg/dL; µmol/L is divided by 88.4. Result is indexed to 1.73 m² body surface area.
Compare inputs and results consistently
Begin with the quantity named by this calculator and the format required by each field. The example below records a complete set of inputs and the corresponding calculated output. Change one input at a time to see which part of the result depends on it.
Use the formula notes to check units, rounding and supported operations. A reference result validates the stated calculation; it does not add information that was never entered. Any limits or entertainment-only purpose are described on this page.
Formula and calculation method
eGFR=142×min(SCr/k,1)^alpha×max(SCr/k,1)^−1.2×0.9938^age×1.012 if female. k=0.7 female or 0.9 male; alpha=−0.241 female or −0.302 male.
SCr uses mg/dL; µmol/L is divided by 88.4. Result is indexed to 1.73 m² body surface area.
Scope and Limitations
- Adult stable-creatinine estimate, not a kidney diagnosis, medication dose or substitute for clinical assessment. Not applicable to acute/rapidly changing creatinine. Combined creatinine/cystatin-C equations may be more accurate; trends and urine albumin also matter.
Reference Sources
Frequently asked questions
How does this calculator work?
eGFR=142×min(SCr/k,1)^alpha×max(SCr/k,1)^−1.2×0.9938^age×1.012 if female. k=0.7 female or 0.9 male; alpha=−0.241 female or −0.302 male.
What assumptions should I check?
Adult stable-creatinine estimate, not a kidney diagnosis, medication dose or substitute for clinical assessment. Not applicable to acute/rapidly changing creatinine. Combined creatinine/cystatin-C equations may be more accurate; trends and urine albumin also matter. SCr uses mg/dL; µmol/L is divided by 88.4. Result is indexed to 1.73 m² body surface area.
Can I save or print this calculation?
Use Copy link with inputs to reproduce the scenario, Download results for a text record, or Print. Where a schedule is shown, its CSV download includes every row.
What happens when I change measurement units?
The linked unit selector converts the existing measurement so it represents the same physical quantity. Entering a different number after switching units changes the underlying input. The result’s own units are shown beside its value.