What is calculated
Adult race-free 2021 CKD-EPI creatinine eGFR.
eGFR Calculator (2021 CKD-EPI Creatinine)
Estimated GFR
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesOpen Full calculation and sources to review the formula, assumptions, boundaries, and evidence.
Versioned calculationFormula v1.0.1
Method
Apply sex-specific k and alpha coefficients to standardized creatinine and age.
Important boundary
The estimate is indexed to 1.73 m² and is not measured GFR.
Use laboratory creatinineUse the labeled input and matching unit.
Measured or label valueApply 2021 coefficientsThe calculator applies the stated equation.
Full precision firstKeep CKD criteria separateKeep the boundary beside the result.
Reference, not diagnosisInterpretation
is the indexed adult estimate.
The equation inputs remain visible.
Do not diagnose CKD from one number.
Use this result
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Related calculators and resources
Method and test recordFormula v1.0.1
- Recorded scope
- health-wellness-completion
- Publisher
- CalculatorGeek
- Recorded review date
- 2026-10-05
- Next source review
- 2027-04-05
- Definition fixtures
- 3 configured scenarios
- Published examples
- 3 shown below
Recorded method
Verify all published coefficients, min/max branches, sex factors, age power, and creatinine units.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- Adult creatinine-only equation.
- Not measured GFR.
- Creatinine is affected by muscle mass, diet, medicines, and acute change.
- Does not determine CKD diagnosis, prognosis, monitoring, referral, or drug dose.
Method sources
Latest model update
2026-10-05 - Initial evidence-limited shared-system implementation with fixtures, original support content, and contextual links.
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| female adult reference | Equation sex coefficient: female; Age: 50 number; Standardized serum creatinine: 1 mg/dL | Estimated GFR: 68.6334967 mL/min/1.73 m² (allowed numeric tolerance: 0.02) |
| male adult reference | Equation sex coefficient: male; Age: 60 number; Standardized serum creatinine: 1.2 mg/dL | Estimated GFR: 69.239 mL/min/1.73 m² (allowed numeric tolerance: 0.05) |
| micromole equivalence | Equation sex coefficient: female; Age: 50 number; Standardized serum creatinine: 88.4 umol/L | Estimated GFR: 68.6334967 mL/min/1.73 m² (allowed numeric tolerance: 0.02) |
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On this page
What the eGFR Calculator (2021 CKD-EPI Creatinine) calculates
Calculate adult 2021 CKD-EPI creatinine eGFR from age, equation sex coefficient, and standardized serum creatinine.
The implementation is race-free, names the equation in the result, and preserves the distinction between indexed eGFR and measured kidney function.
How to use the eGFR Calculator (2021 CKD-EPI Creatinine)
- Use an IDMS-standardized laboratory creatinine.
- Select the coefficient used by the equation.
- Enter adult age.
- Review the estimate with trends, urine albumin, and clinical context.
Continue with the Body Surface Area Calculator. Calculate BSA separately without silently de-indexing eGFR.
Formula, variables and calculation order
eGFR = 142 x min(Scr/k,1)^alpha x max(Scr/k,1)^-1.200 x 0.9938^age x female factor.
Inputs are validated and normalized before calculation. Full precision is retained until the displayed result is rounded.
Cross-check a different part of the decision with the A1C Calculator. Translate a separate laboratory marker.
Worked example and boundary check
Worked example
For a 50-year-old using the female coefficient and creatinine 1.0 mg/dL, eGFR is about 69 mL/min/1.73 m².
Boundary check
This route does not calculate pediatric Schwartz, cystatin-C, creatinine-cystatin, or body-surface-area-adjusted drug-dosing values.
How to interpret the result
Use the estimate with a clinician and laboratory report. CKD requires persistent findings or other markers; G1/G2 alone do not establish CKD without kidney-damage evidence.
- Adult creatinine-only equation.
- Not measured GFR.
- Creatinine is affected by muscle mass, diet, medicines, and acute change.
- Does not determine CKD diagnosis, prognosis, monitoring, referral, or drug dose.
For a separate result with different assumptions, open the Blood Pressure Calculator. Classify a separate measured reading.
Frequently asked questions
Does this equation use race?
No. It is the 2021 race-free CKD-EPI creatinine equation.
Does eGFR below 60 always mean CKD?
CKD assessment includes persistence and other evidence; use current professional guidance.
Can I enter micromoles per liter?
Yes; the input converts to mg/dL.
Can I use it for a child?
No. This route is limited to adults.
Primary sources and evidence limits
Sources were checked 2026-10-05. A reference value, conversion, or schedule estimate is not a diagnosis, prescription, individualized treatment target, or substitute for professional care.