GFR Calculator
Calculate your Glomerular Filtration Rate and kidney function status. Get your kidney health assessment using advanced medical formulas.
Your Information
Advanced Options
Your Results
Formula Comparison
📋 Clinical Recommendations
Kidney Disease Stages Reference
| Stage | GFR Range | Kidney Function | Action |
|---|---|---|---|
| Stage 1 | ≥ 90 | Normal or High | Maintain health |
| Stage 2 | 60-89 | Mildly Decreased | Monitor regularly |
| Stage 3A | 45-59 | Mildly to Moderately Decreased | Consult nephrologist |
| Stage 3B | 30-44 | Moderately Decreased | Regular monitoring |
| Stage 4 | 15-29 | Severely Decreased | Specialist care |
| Stage 5 | < 15 | Kidney Failure | Dialysis/Transplant |
🏥 Welcome to the GFR Calculator
Enter your medical information on the left and click “Calculate” to get your kidney function assessment.
Understanding Your Kidney Health
What is GFR?
Glomerular Filtration Rate (GFR) measures how well your kidneys filter waste from your blood. It’s the best overall indicator of kidney function. A normal GFR is 90 or higher, and it naturally declines with age.
Understanding Creatinine
Serum creatinine is a waste product from muscle metabolism filtered by your kidneys. Higher levels suggest reduced kidney function. Creatinine levels vary by age, gender, muscle mass, and diet, so GFR calculations adjust for these factors.
Calculation Methods
CKD-EPI (2021): Recommended standard, race-free formula. MDRD: Older formula, still used in some settings. Both use creatinine, age, and gender to estimate GFR.
Kidney Disease Stages
Chronic Kidney Disease (CKD) has 5 stages based on GFR. Stage 1-2 indicate mild disease, Stage 3A-3B moderate disease, Stage 4 severe disease, and Stage 5 kidney failure requiring dialysis or transplant.
Risk Factors for Kidney Disease
- Diabetes (leading cause)
- High blood pressure
- Family history of kidney disease
- Age over 60
- Obesity
- Smoking
Protect Your Kidney Health
- Control blood pressure and blood sugar
- Stay physically active
- Maintain healthy weight
- Limit salt and processed foods
- Stay hydrated
- Get regular check-ups
Important Disclaimer
This calculator provides estimates based on standard medical formulas. Results should not replace professional medical evaluation. For accurate kidney function assessment and personalized medical advice, consult with your healthcare provider or nephrologist. This tool is for informational purposes only.