Updated · Methodology: named formula library
eGFR Kidney Function Calculator
Estimated glomerular filtration rate (CKD-EPI).
Cockcroft-Gault: ((140 − 55) × 75 kg × 1) / (72 × 1.1) = 80.5 mL/min.
Why This Calculation Matters
The eGFR Kidney Function Calculator turns a well-known health formula into an instant lookup. It's most useful when you're tracking a number over time or comparing yourself against published reference ranges from bodies like the CDC, NIH, or WHO. Use it as one data point among many, not a diagnosis.
How to Use This Calculator
- Enter your values in the input fields, each one has a label and help text explaining what to type.
- Results appear instantly as you type; there's no "calculate" button to press.
- Change any input to compare scenarios side by side.
All math happens in your browser. Nothing you type is sent to a server, saved, or shared.
Reading Your Result
A single number tells you less than a trend. Track this value over weeks or months rather than obsessing over day-to-day variation. Hydration, sleep, and timing can all shift short-term readings without reflecting any real change.
How to Use
Enter values in the fields on the left. Results update as you type, no submit button needed.
Understanding Results
Each output shows the calculated figure plus a breakdown of contributing inputs. Compare scenarios by editing any value.
Accuracy Notes
Every eGFR Kidney Function Calculator on CalcIntel uses a documented formula. Results are estimates, real outcomes depend on assumptions and market conditions not captured in a simplified calculation.
Formula
Metric: BMI = kg / m². Imperial: BMI = (lb / in²) × 703. WHO categories: underweight <18.5, normal 18.5-24.9, overweight 25-29.9, obese ≥30.
Worked Example
50 yo male, 70 kg, Cr 1.0
- age
- 50
- weight
- 70
- creatinine
- 1
- sex
- male
- Result
- 88 mL/min
((140 − 50) × 70 × 1.0) / (72 × 1.0) = 88 mL/min.
When to Use This Calculator
- Track personal health metrics over time alongside guidance from your clinician.
- Understand how lifestyle changes may influence a given health number.
- Compare values against recognized reference ranges from CDC, NIH, or WHO.
Limitations & Common Mistakes
- Not a substitute for medical advice. Always consult a qualified clinician for anything that affects your care.
- Population-level formulas don't account for individual medical history, medications, or body composition nuances.
- Reference ranges evolve, use current CDC/NIH/WHO values when accuracy matters.
Frequently Asked Questions
What is the Cockcroft-Gault formula?
CrCl (mL/min) = ((140 − age) × weight in kg × sex factor) / (72 × serum creatinine in mg/dL). Sex factor: 1.0 for male, 0.85 for female. Published by Cockcroft and Gault in 1976; widely used for kidney function estimation and drug dosing.
What's a normal CrCl range?
Normal: > 90 mL/min. Mild reduction: 60–89. Moderate (CKD stage 3): 30–59. Severe (stage 4): 15–29. Kidney failure (stage 5): < 15. Adjust drug dosing for patients below 60 mL/min.
Cockcroft-Gault vs MDRD vs CKD-EPI?
Cockcroft-Gault uses age, weight, sex, and serum creatinine — useful for drug dosing. MDRD and CKD-EPI are body-surface-area normalized and preferred for staging CKD. For simple drug dosing, Cockcroft-Gault remains the FDA reference standard.
When is Cockcroft-Gault inaccurate?
In extremes of body weight (very obese, very thin), unstable creatinine (acute kidney injury, rhabdomyolysis), pregnancy, and amputation. In these cases, measured 24-hour urine creatinine clearance is the gold standard.
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Related guides
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- BMI vs. Body Fat Percentage: Which Number Actually Measures HealthBMI is free and fast. Body fat percentage is more accurate. Waist-to-hip ratio predicts cardiovascular risk better than either. Here is when to use which, and what the CDC and WHO actually recommend.
Source: BLS Consumer Price Index, 2026.