{
  "slug": "egfr",
  "title": "eGFR Kidney Function Calculator",
  "heading": "eGFR Calculator",
  "category": "fitness-health",
  "url": "https://www.revenuelab.fyi/toolbox/egfr",
  "summary": "Estimated glomerular filtration rate from serum creatinine.",
  "description": "Estimate kidney filtration using the CKD-EPI 2021 creatinine equation, which no longer applies a race coefficient, and see the corresponding chronic kidney disease stage.",
  "formula": "CKD-EPI 2021: 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.200 × 0.9938^age × 1.012 if female.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=egfr",
  "inputs": [
    {
      "id": "scr",
      "label": "Serum creatinine",
      "kind": "number",
      "hint": null,
      "default": 1.1,
      "unit": "mg/dL",
      "min": 0.1,
      "max": null
    },
    {
      "id": "age",
      "label": "Age",
      "kind": "number",
      "hint": null,
      "default": 55,
      "unit": "yr",
      "min": 18,
      "max": 110
    },
    {
      "id": "sex",
      "label": "Sex",
      "kind": "select",
      "hint": null,
      "default": "male",
      "options": [
        {
          "value": "male",
          "label": "Male"
        },
        {
          "value": "female",
          "label": "Female"
        }
      ]
    }
  ],
  "outputs": [
    {
      "id": "egfr",
      "label": "eGFR (mL/min/1.73 m²)",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "stage",
      "label": "CKD stage",
      "format": "raw",
      "hint": null,
      "primary": false
    },
    {
      "id": "pctNormal",
      "label": "Percent of typical function",
      "format": "percent",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Serum creatinine: 1.1 mg/dL",
      "Age: 55 yr",
      "Sex: Male"
    ],
    "outputs": [
      "eGFR (mL/min/1.73 m²): 79.3",
      "CKD stage: G2",
      "Percent of typical function: 79%"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter serum creatinine (mg/dL).",
      "Enter age (yr).",
      "Enter sex.",
      "Read your egfr (ml/min/1.73 m²) on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "scr": 0.66,
        "age": 55,
        "sex": "male"
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "scr": 1.1,
        "age": 55,
        "sex": "male"
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "scr": 1.7600000000000002,
        "age": 55,
        "sex": "male"
      }
    }
  ],
  "limitations": [
    "Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.",
    "Results do not account for medical conditions, medication, or pregnancy.",
    "Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it."
  ],
  "faq": [
    {
      "q": "Why no race coefficient?",
      "a": "The 2021 CKD-EPI refit removed it. Race is a social category, not a biological determinant of creatinine generation, and the coefficient delayed care for Black patients."
    },
    {
      "q": "Is a single value diagnostic?",
      "a": "No. Chronic kidney disease requires abnormality persisting over three months, plus context like albuminuria."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — eGFR Kidney Function Calculator (https://www.revenuelab.fyi/toolbox/egfr)"
}