GFR Calculator
Estimate your Glomerular Filtration Rate (GFR) using the CKD-EPI formulaโthe recommended standard for assessing kidney function. Enter your age, gender, race, and serum creatinine level to get a personalized GFR estimate and kidney function stage. This tool helps you monitor kidney health and detect potential issues early.
How to Use This Tool
1. Enter Age
Years
2. Select Gender
Male or Female
3. Select Race
Black or Other
4. Enter Creatinine
mg/dL
5. Get Results
View GFR & kidney stage
Formula & Calculation
Results are rounded to the nearest whole number.
Quick Reference GFR Table
| Stage | GFR (mL/min/1.73mยฒ) | Kidney Function | Description |
|---|---|---|---|
| Stage 1 | โฅ 90 | Normal | Normal kidney function |
| Stage 2 | 60โ89 | Mild | Mildly decreased |
| Stage 3a | 45โ59 | Moderate | Mild to moderate decrease |
| Stage 3b | 30โ44 | Moderate | Moderate to severe decrease |
| Stage 4 | 15โ29 | Severe | Severely decreased |
| Stage 5 | < 15 | Kidney Failure | Kidney failure |
How We Calculated
- Input: We collected your age, gender, race, and serum creatinine level.
- Parameters: Set ฮบ (kappa) and ฮฑ (alpha) based on gender.
- Calculation: Applied the CKD-EPI formula with race and gender adjustments.
- Stage: Compared your GFR to NKF guidelines to determine kidney function stage.
Why Trust This Tool?
Recommended by NKF & KDIGO
No server storage
Use instantly
Works on all devices
Latest kidney health guidelines
No hidden charges
Accuracy & Standards
This calculator uses the CKD-EPI formula, which is the recommended standard by the National Kidney Foundation (NKF) and KDIGO for estimating GFR. Results are rounded to the nearest whole number. The tool is for educational purposesโnot a substitute for professional medical advice.
GFR Stages
โฅ90
60-89
30-59
15-29
<15
Learn About GFR
What is GFR?
GFR (Glomerular Filtration Rate) is a measure of how well your kidneys filter waste from your blood. It's a key indicator of kidney function and is used to diagnose and monitor kidney disease.
Why It Matters
Chronic kidney disease (CKD) affects millions worldwide. Early detection through GFR monitoring can help slow progression and prevent complications. Regular screening is recommended for those at risk.
Protecting Kidney Health
Stay hydrated, maintain a healthy diet (low sodium, balanced protein), control blood sugar and blood pressure, avoid NSAIDs, and get regular check-ups to support kidney health.
Real-World Examples
- Example 1: 45yo male, Creatinine 1.0, Non-Black โ GFR: 93 mL/min/1.73mยฒ (Stage 1)
- Example 2: 60yo female, Creatinine 1.2, Black โ GFR: 68 mL/min/1.73mยฒ (Stage 2)
- Example 3: 70yo male, Creatinine 2.0, Non-Black โ GFR: 37 mL/min/1.73mยฒ (Stage 3b)
Limitations of This Tool
- Provides estimatesโindividual GFR may vary.
- Does not account for muscle mass, diet, or other factors affecting creatinine.
- Not suitable for children, pregnant women, or individuals with acute kidney injury.
- Always consult a healthcare professional for interpretation and medical advice.
Trust & Privacy
We take your privacy seriously. This tool:
- Does not store data on any server
- All calculations happen locally in your browser
- No cookies are used for this tool
References
- Levey AS, Stevens LA, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med. 2009.
- National Kidney Foundation. CKD Stages and GFR Guidelines. Kidney.org.
- KDIGO. Clinical Practice Guideline for CKD Evaluation and Management. KDIGO.org.
- Centers for Disease Control and Prevention. Chronic Kidney Disease. CDC.gov.
Editorial Process
The Healthtus editorial team, consisting of healthcare professionals and medical writers, reviews this tool regularly to ensure accuracy and alignment with the latest kidney health guidelines. We update the content and references as new research emerges.
Last reviewed: July 2026