eGFR Calculator CKD-EPI
Calculate Your Kidney Function Using the CKD-EPI Equation
The eGFR Calculator CKD-EPI estimates your glomerular filtration rate (eGFR) using the internationally recommended CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation. eGFR is one of the most important indicators of kidney function and is routinely used by healthcare professionals to detect, stage, and monitor chronic kidney disease (CKD).
Simply enter your age, sex, and serum creatinine level to calculate your estimated GFR in seconds.
What Is eGFR?
Estimated Glomerular Filtration Rate (eGFR) is a calculated value that estimates how well your kidneys filter waste products from the blood.
Because directly measuring GFR is complex and time-consuming, clinicians estimate kidney function using equations that incorporate:
- Age
- Sex
- Serum creatinine
- (Race is no longer included in the latest CKD-EPI equation.)
The CKD-EPI equation provides greater accuracy than older formulas, especially in individuals with normal or mildly reduced kidney function.
Why Use the CKD-EPI Equation?
The CKD-EPI equation has become the preferred method for estimating kidney function because it:
- Provides improved accuracy compared with the MDRD equation
- Performs better at higher GFR values
- Supports earlier detection of chronic kidney disease
- Helps monitor kidney disease progression
- Assists healthcare professionals with medication dosing
- Is recommended by international kidney disease guidelines
How to Use the eGFR Calculator CKD-EPI
Using this calculator is simple.
- Enter your age.
- Select your biological sex.
- Enter your serum creatinine (mg/dL).
- Click Calculate.
- View your estimated GFR and kidney function category.
Understanding Your Results
| eGFR (mL/min/1.73 m²) | Kidney Function |
|---|---|
| ≥90 | Normal or high kidney function* |
| 60–89 | Mildly decreased kidney function |
| 45–59 | Mild to moderate decrease (Stage G3a) |
| 30–44 | Moderate to severe decrease (Stage G3b) |
| 15–29 | Severe reduction (Stage G4) |
| <15 | Kidney failure (Stage G5) |
*An eGFR above 90 is considered normal only if there are no other signs of kidney damage.
What Can Affect eGFR?
Several factors may influence eGFR results, including:
- Muscle mass
- Hydration status
- Recent intense exercise
- Pregnancy
- Certain medications
- Acute kidney injury
- Dietary protein intake
For this reason, healthcare professionals interpret eGFR alongside:
- Urine Albumin-to-Creatinine Ratio (ACR)
- Medical history
- Blood pressure
- Imaging studies
- Other laboratory tests
When Should You Have Your eGFR Checked?
Your healthcare provider may recommend an eGFR test if you:
- Have diabetes
- Have high blood pressure
- Have cardiovascular disease
- Have a family history of kidney disease
- Are over 60 years of age
- Take medications that may affect kidney function
- Have abnormal urine test results
- Have symptoms suggestive of kidney disease
Limitations of the CKD-EPI Equation
Although widely used, the CKD-EPI equation has limitations. Results may be less accurate in:
- Pregnancy
- Children under 18 years
- Individuals with very high or very low muscle mass
- Bodybuilders
- Amputees
- Patients with acute kidney injury
- Individuals with rapidly changing kidney function
Clinical assessment is essential when interpreting results.
Why Is eGFR Important?
Monitoring kidney function helps healthcare professionals:
- Detect chronic kidney disease early
- Monitor disease progression
- Adjust medication doses safely
- Plan specialist referral when appropriate
- Assess overall kidney health
Early detection allows interventions that may slow CKD progression and reduce complications.
Frequently Asked Questions
What is a normal eGFR?
An eGFR of 90 mL/min/1.73 m² or higher is generally considered normal when there are no other signs of kidney damage.
Does a low eGFR always mean kidney disease?
Not always. Temporary reductions may occur due to dehydration, certain medications, or acute illness. Persistent reductions require medical evaluation.
Which equation does this calculator use?
This calculator uses the CKD-EPI equation, which is recommended by many clinical guidelines for estimating kidney function in adults.
Can I use this calculator if I am pregnant?
No. The CKD-EPI equation has not been validated for pregnancy.
Is serum creatinine measured in mg/dL?
This version of the calculator uses mg/dL.
Medical Disclaimer: This calculator is intended for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.