Kidney Function
eGFR
91.7 mL/min
Stage 1: Normal or High
Formula Selection
The 2021 formula is recommended by NKF and ASN. It does not use race.
Patient Information
Normal: 0.7-1.2 mg/dL (men), 0.5-1.0 mg/dL (women)
Your GFR on the CKD Scale
Formula Comparison
| Formula | eGFR (mL/min) | Stage |
|---|---|---|
| CKD-EPI 2021 | 91.7 | G1 |
| CKD-EPI 2009 | 87.4 | G2 |
| MDRD | 79.1 | G2 |
CKD Stages Reference
| Stage | GFR Range | Description |
|---|---|---|
| G1 | ≥90 | Normal or high |
| G2 | 60-89 | Mildly decreased |
| G3a | 45-59 | Mild to moderately decreased |
| G3b | 30-44 | Moderate to severely decreased |
| G4 | 15-29 | Severely decreased |
| G5 | <15 | Kidney failure |
Normal Creatinine Levels
Adult Males
0.7-1.2 mg/dL
Adult Females
0.5-1.0 mg/dL
Note: Creatinine levels can be affected by muscle mass, diet, medications, and hydration status.
Kidney Health Scenarios
Explore how changes affect your results
Your GFR vs Population
Compared to the general population
Your eGFR
91.7 mL/min
Percentile
53th
Above average - great job!
Distribution
Low
50.0
Below Average
70.0
Average
90.0
Above Average
105.0
Excellent
120.0
Your Ranking
Top 47%
47% are lower
Kidney Health Tips
Based on your results
Your GFR Status
Your GFR of 91.7 mL/min indicates normal or high kidney function. Focus on maintaining this through healthy lifestyle choices.
Blood Pressure Control
Keep blood pressure below 130/80 mmHg. High blood pressure is a leading cause of kidney damage.
Stay Hydrated
Drink adequate water daily. Proper hydration helps kidneys filter waste efficiently.
Frequently Asked Questions
What is GFR (Glomerular Filtration Rate)?
GFR measures how well your kidneys filter waste from blood, expressed in mL/min/1.73m². Normal GFR is 90-120. It's the best measure of kidney function and is used to stage chronic kidney disease (CKD).
What do the CKD stages mean?
Stage 1: Normal (GFR ≥90). Stage 2: Mild loss (60-89). Stage 3a: Mild-moderate (45-59). Stage 3b: Moderate-severe (30-44). Stage 4: Severe (15-29). Stage 5: Kidney failure (<15). Lower stages require more intensive treatment.
Why was the CKD-EPI 2021 formula introduced?
The 2021 formula removes race from the calculation. Previous formulas used race coefficients that could lead to delayed diagnosis and treatment for Black patients. The new formula provides more equitable care across all populations.
What is creatinine?
Creatinine is a waste product from muscle metabolism. Healthy kidneys filter it out of blood into urine. High blood creatinine suggests kidneys aren't filtering well. Normal levels: 0.7-1.2 mg/dL (men), 0.5-1.0 mg/dL (women).
How can I improve my GFR?
Manage blood pressure (<130/80), control blood sugar if diabetic, reduce salt intake, stay hydrated, exercise regularly, avoid NSAIDs, quit smoking, and limit alcohol. Some GFR loss with age is normal but can be slowed.
How this works
Formulas are implementations of published clinical or public-health equations. Calculations run in your browser — no inputs are transmitted to our servers and no account is required. The result is informational; it does not diagnose, treat, or replace advice from a clinician.
What this tool can’t do
When to consult a professional
Talk to a licensed healthcare provider before using the output of this tool to make a medical decision, especially if you have an underlying condition, are pregnant, or are on medication that affects metabolism or fluid balance.
Sources
- [1]Centers for Disease Control and Prevention (CDC)Official sourcecdc.govAccessed Apr 21, 2026
- [2]National Institutes of Health (NIH)Official sourcenih.govAccessed Apr 21, 2026
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).