Health & FitnessFormula-based · Runs in your browser

GFR Calculator

Estimate race-free kidney filtration with the 2021 CKD-EPI creatinine equation for adults or the CKiD U25 creatinine equation for ages 1–25.

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Inputs

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Result

Updates as valid inputs change.

Calculated locally
eGFR is an estimate, not a diagnosis. Kidney assessment depends on trends, albuminuria, clinical context, and appropriately standardized laboratory measurements.
Estimated GFR
GFR category
Equation used
Creatinine used
Interpretation note

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Calculation steps

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  1. 1

    Formula selected

    The calculator uses the following formula or method.

    Adult 2021 CKD-EPI: 142×min(SCr/κ,1)^α×max(SCr/κ,1)^−1.200×0.9938^age×1.012 if female; CKiD U25: κ(age,sex)×height(m)/SCr.

  2. 2

    Values entered

    Your values are placed into the calculation.

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  3. 3

    Result calculated

    The formula or method produces the following result values.

    Results will appear after a successful calculation.

  4. 4

    Answer formatted

    Displayed values are rounded and formatted using each output’s configured precision.

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How it works

Adult mode uses the 2021 CKD-EPI creatinine equation. Pediatric and young-adult mode uses the CKiD U25 creatinine equation with age- and sex-specific coefficients.

Input query strings and outputs

Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.

Input query strings

6
  • ?ageGroup= Equation population

    Choice · Required · Default: adult · Accepted values: adult, pediatric

  • ?age= Age

    Number · Required · Default: 50

  • ?sex= Sex used by equation

    Choice · Required · Default: male · Accepted values: male, female

  • ?creatinineUnit= Serum creatinine unit

    Choice · Required · Default: mgdl · Accepted values: mgdl, umol

  • ?creatinine= Serum creatinine

    Number · Required · Default: 1

  • ?heightCm= Height for CKiD U25

    Number · Required · Default: 140 · Used when ageGroup = pediatric

Outputs

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  • egfr Estimated GFR

    Number · Primary output · Suffix: mL/min/1.73 m²

  • category GFR category

    Text

  • equation Equation used

    Text

  • creatinineMgDl Creatinine used

    Number · Suffix: mg/dL

  • interpretation Interpretation note

    Text

Interpretation limit

A single eGFR result cannot diagnose chronic kidney disease. Trends, urine albumin, laboratory standardization, medicines, muscle mass, and clinical context matter.

Sources
Limitations
  • eGFR is an estimate, not a diagnosis. Kidney assessment depends on trends, albuminuria, clinical context, and appropriately standardized laboratory measurements.
  • Health results are educational estimates, not a diagnosis or treatment recommendation. Individual circumstances may require a qualified clinician's assessment.