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Kidney Health Check Calculator

Professional kidney function assessment using CKD-EPI, MDRD, and Cockcroft-Gault equations. Calculate estimated GFR, assess kidney health, and monitor CKD stages instantly.

Home › Health › Creatinine Clearance Calculator
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CKD-EPI Equation

Most Accurate GFR Estimation (2009)
years
mg/dL

CKD-EPI Estimated GFR

0
mL/min/1.73m²
📈

MDRD Equation

Modification of Diet in Renal Disease (1999)
years
mg/dL

MDRD Estimated GFR

0
mL/min/1.73m²
⚖️

Cockcroft-Gault

Creatinine Clearance Estimation (1976)
years
kg
mg/dL

Cockcroft-Gault Creatinine Clearance

0
mL/min

Chronic Kidney Disease (CKD) Stages

Stage 1
GFR ≥90
Stage 2
60-89
Stage 3a
45-59
Stage 3b
30-44
Stage 4
15-29
Stage 5
<15
Note: CKD is diagnosed when GFR <60 mL/min/1.73m² for 3+ months>

How to Use Kidney Health Calculators

1

Gather Your Lab Results

You'll need your recent serum creatinine level (mg/dL) from blood tests. Also note your age, gender, weight, and race for accurate calculations.

2

Choose Calculation Method

Select between CKD-EPI (most accurate), MDRD (good for CKD), or Cockcroft-Gault (useful for medication dosing). Each has specific uses.

3

Enter Accurate Information

Provide precise values for all required fields. Small errors in creatinine or weight can significantly affect GFR estimation accuracy.

4

Interpret Results

Compare your GFR to CKD stages. Understand what the results mean for your kidney health and when to consult a healthcare provider.

Frequently Asked Questions

Which kidney function calculator is most accurate? +
The CKD-EPI equation is currently considered the most accurate for estimating GFR in the general population. It performs better than MDRD at higher GFR levels (>60 mL/min/1.73m²). For medication dosing, Cockcroft-Gault is still widely used despite being less accurate.
What is a normal GFR by age? +
Normal GFR decreases with age: 20s-30s: 100-130 mL/min, 40s-50s: 90-120 mL/min, 60s-70s: 80-110 mL/min, 80+: 70-100 mL/min. GFR below 60 mL/min/1.73m² for 3+ months indicates chronic kidney disease regardless of age.
Why do I need different GFR calculations? +
Different equations serve different purposes: CKD-EPI for general screening and diagnosis, MDRD for monitoring CKD progression, and Cockcroft-Gault for medication dose adjustment. Each has strengths for specific clinical situations.
How often should I check my kidney function? +
Annual screening if you have diabetes, hypertension, family history of kidney disease, or are over 60. Every 3-6 months if you have CKD. Consult your doctor for personalized screening recommendations based on your risk factors.
What factors affect creatinine levels? +
Creatinine levels are affected by muscle mass, age, gender, diet (high meat intake), medications, hydration status, and kidney function. This is why GFR equations adjust for these factors to provide more accurate kidney function assessment.
When should I see a kidney specialist? +
Consult a nephrologist if: GFR <30 mL/min, rapid decline in GFR (>5 mL/min/year), persistent proteinuria, unexplained hematuria, difficult-to-control hypertension with CKD, or complex electrolyte abnormalities.

References & Clinical Sources

Clinical Guidelines & Validation Studies

CKD-EPI Equation
  • Levey, A. S., et al. (2009). A new equation to estimate glomerular filtration rate. Annals of Internal Medicine, 150(9), 604-612
  • Levey, A. S., et al. (2020). Measurement of kidney function. Medical Clinics of North America, 104(6), 1023-1035
  • Inker, L. A., et al. (2021). New creatinine- and cystatin C–based equations to estimate GFR without race. New England Journal of Medicine, 385(19), 1737-1749
  • Kidney Disease: Improving Global Outcomes (KDIGO). (2023). Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney International, 103(3S), S1-S127
MDRD Study Equation
  • Levey, A. S., et al. (1999). A more accurate method to estimate glomerular filtration rate from serum creatinine: a new prediction equation. Annals of Internal Medicine, 130(6), 461-470
  • Levey, A. S., et al. (2006). Using standardized serum creatinine values in the modification of diet in renal disease study equation for estimating glomerular filtration rate. Annals of Internal Medicine, 145(4), 247-254
  • National Kidney Foundation. (2002). K/DOQI clinical practice guidelines for chronic kidney disease: evaluation, classification, and stratification. American Journal of Kidney Diseases, 39(2 Suppl 1), S1-S266
Cockcroft-Gault Formula
  • Cockcroft, D. W., & Gault, M. H. (1976). Prediction of creatinine clearance from serum creatinine. Nephron, 16(1), 31-41
  • Winter, M. A., et al. (2012). Limitations of the Cockcroft-Gault equation for estimating glomerular filtration rate. American Journal of Health-System Pharmacy, 69(18), 1575-1580
  • Matzke, G. R., et al. (2011). Drug dosing consideration in patients with acute and chronic kidney disease—a clinical update from Kidney Disease: Improving Global Outcomes (KDIGO). Kidney International, 80(11), 1122-1137
CKD Classification & Guidelines
  • Levey, A. S., & Coresh, J. (2012). Chronic kidney disease. The Lancet, 379(9811), 165-180
  • Stevens, P. E., & Levin, A. (2013). Evaluation and management of chronic kidney disease: synopsis of the kidney disease: improving global outcomes 2012 clinical practice guideline. Annals of Internal Medicine, 158(11), 825-830
  • American Society of Nephrology (ASN). (2021). Reassessing the Inclusion of Race in Diagnosing Kidney Diseases: An Interim Report. Journal of the American Society of Nephrology, 32(6), 1305-1317
  • National Institute for Health and Care Excellence (NICE). (2021). Chronic kidney disease: assessment and management. NICE guideline [NG203]
Clinical Validation & Comparison Studies
  • Stevens, L. A., et al. (2010). Comparative performance of the CKD Epidemiology Collaboration (CKD-EPI) and the Modification of Diet in Renal Disease (MDRD) Study equations for estimating GFR levels above 60 mL/min/1.73 m². American Journal of Kidney Diseases, 56(3), 486-495
  • Michels, W. M., et al. (2010). Performance of the Cockcroft-Gault, MDRD, and new CKD-EPI formulas in relation to GFR, age, and body size. Clinical Journal of the American Society of Nephrology, 5(6), 1003-1009
  • Pottel, H., et al. (2018). Estimating glomerular filtration rate for the full age spectrum from serum creatinine and cystatin C. Nephrology Dialysis Transplantation, 33(3), 497-507
Important Medical Disclaimer

Clinical Use Notice: This tool provides estimated GFR calculations based on validated equations. It is intended for educational and informational purposes only, not for clinical decision-making.

  • All GFR estimates have limitations and may be inaccurate in certain populations (elderly, extremes of body size, amputees, severe malnutrition, muscle wasting disorders, pregnancy, or rapidly changing kidney function)
  • Direct measurement of GFR (via iohexol, iothalamate, or other filtration markers) remains the gold standard for accurate assessment
  • Clinical decisions regarding diagnosis, treatment, or medication dosing should always be made by qualified healthcare professionals using comprehensive clinical assessment
  • Always confirm abnormal results with repeat testing and clinical correlation

Calculator version: 3.2 | Clinical validation: Based on KDIGO, NKF, and ASN guidelines
Equations implemented: CKD-EPI (2021), MDRD 4-variable, Cockcroft-Gault (standardized)

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