Calculate Your GFR: Glomerular Filtration Rate
Reference values in health come from large population studies (NHANES, WHO). They provide a framework to interpret your results, but your personal context always comes first. GFR (CKD-EPI) is the gold standard for evaluating kidney function. These values are updated to 2026 and reviewed periodically to keep you current.
When to use this calculator
- Technical calculations related to GFR and kidney function
- Healthcare students and professionals
- Validate theoretical results before clinical application
- Teaching and learning kidney function concepts
- Quick reference for patient care and health projects
Calculation Example
- 1 mg/dL, age 45 Male
- ~90
How it works
1 min readNormal health reference values come from large population studies (NHANES, WHO, CDC). They vary by age, sex, ethnicity, and region. They're informational; your personal medical history always takes precedence.
How It's Calculated
GFR (CKD-EPI) is the gold standard for evaluating kidney function.
This calculator applies the formula with your input values, checking typical ranges and alerting you to any unreasonable values.
Normal Reference Ranges
| Parameter | Normal Adult Range |
|---|---|
| Blood Pressure | <120/80 mmHg |
| Resting Heart Rate | 60-100 bpm |
| Temperature | 36.1-37.2°C |
| SpO2 | 95-100% |
| Fasting Glucose | 70-100 mg/dL |
| HbA1c | <5.7% |
| Total Cholesterol | <200 mg/dL |
| LDL | <100 mg/dL |
| HDL | >40 (M) / >50 (F) |
Final Notes
This calculation is an informational reference. For critical decisions (financial, medical, legal), consult a specialized healthcare professional. Values are updated to 2026 and reviewed periodically.
Frequently asked questions
What is GFR?
Glomerular Filtration Rate—the best marker of kidney function.
What's a normal GFR?
>90 mL/min/1.73m²
What are the CKD stages?
G1:≥90, G2:60-89, G3a:45-59, G3b:30-44, G4:15-29, G5:<15
Why does GFR decline?
Age, diabetes, hypertension, medications, and kidney disease.
What is CKD-EPI 2021?
Updated formula without racial variables, published 2021.
How often should I test my GFR?
Every 3-6 months if you have risk factors for kidney disease.
What diet helps low GFR?
Monitor protein, sodium, and potassium based on your CKD stage.
When should I see my doctor about GFR?
If results are abnormal, you have symptoms, or have a family history of cardiovascular or metabolic disease.