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About This Tool
The eGFR Kidney Function & CKD Staging Calculator evaluates estimated glomerular filtration rate from serum creatinine, age, and biological sex using the clinical 2021 CKD-EPI creatinine equation.
### Clinical 2021 CKD-EPI Equation Architecture The National Kidney Foundation (NKF) and American Society of Nephrology (ASN) established the 2021 race-free creatinine equation as the diagnostic standard: $$\text{eGFR} = 142 \times \min\left(\frac{S_{cr}}{\kappa}, 1\right)^\alpha \times \max\left(\frac{S_{cr}}{\kappa}, 1\right)^{-1.200} \times 0.9938^{\text{Age}} \times [1.012 \text{ if female}]$$ where parameters depend on biological sex: - **Females**: $\kappa = 0.7$, $\alpha = -0.241$, multiplier $= 1.012$. - **Males**: $\kappa = 0.9$, $\alpha = -0.302$, multiplier $= 1.000$. - **Serum Creatinine ($S_{cr}$)**: Measured in milligrams per deciliter (mg/dL).
### Chronic Kidney Disease (CKD) Clinical Staging The calculated eGFR classifies kidney filtration into recognized clinical stages: - **Stage 1 (eGFR $\ge 90$ mL/min/1.73m²)**: Normal or high kidney filtration capacity. - **Stage 2 (eGFR $60–89$ mL/min/1.73m²)**: Mildly decreased filtration. - **Stage 3a (eGFR $45–59$ mL/min/1.73m²)**: Mild to moderately decreased filtration. - **Stage 3b (eGFR $30–44$ mL/min/1.73m²)**: Moderate to severely decreased filtration. - **Stage 4 (eGFR $15–29$ mL/min/1.73m²)**: Severely decreased filtration requiring specialist nephrology care. - **Stage 5 (eGFR $< 15$ mL/min/1.73m²)**: Kidney failure / end-stage renal disease (ESRD).
### Worked Clinical Calculation Example Evaluating routine laboratory bloodwork for a 45-year-old male with a serum creatinine of 0.95 mg/dL: - **Ratio Comparison**: $S_{cr} / \kappa = 0.95 / 0.9 = 1.0556$ - **Lower Minimum Component**: $\min(1.0556, 1)^{-0.302} = 1.000$ - **Upper Maximum Component**: $\max(1.0556, 1)^{-1.200} = (1.0556)^{-1.200} \approx 0.9372$ - **Age Exponent**: $(0.9938)^{45} \approx 0.7561$ - **Calculated eGFR**: $$\text{eGFR} = 142 \times 1.000 \times 0.9372 \times 0.7561 \approx \mathbf{100.6} \rightarrow 98\text{ mL/min/1.73m²}$$ - **Clinical Staging**: Stage 1 (Normal kidney filtration function).
### Scope & Privacy Notice This calculator evaluates mathematical equations for educational and screening review. Clinical kidney disease diagnosis requires comprehensive physician evaluation including urine albumin-to-creatinine ratio (uACR) and blood pressure history. All calculations evaluate locally in your browser memory with zero network uploads.
How to Use
- 1
Enter your serum creatinine value from your laboratory blood panel (mg/dL).
- 2
Input your current age in years.
- 3
Select your biological sex (Male or Female) to apply physiological kappa constants.
- 4
Review your estimated Glomerular Filtration Rate (eGFR) and clinical CKD stage classification.
Frequently Asked Questions
Why was the race adjustment removed from the 2021 CKD-EPI equation?
The joint NKF-ASN task force recommended removing race from clinical kidney function equations to eliminate race-based clinical disparities and provide uniform, equitable diagnostic staging.
What is the significance of the 60 mL/min/1.73m² threshold?
An eGFR persisting below 60 mL/min/1.73m² for 3 months or longer meets the diagnostic threshold for chronic kidney disease, indicating potential filtration impairment.
Is my health or creatinine data sent to external servers?
No. All calculations run strictly in client-side browser JavaScript with zero server telemetry.