eGFR Calculator

Estimate your glomerular filtration rate quickly using serum creatinine and basic personal data.

CKD-EPI 2021 Equation (race-free)

CKD-EPI 2021 · Inker LA et al., N Engl J Med 2021

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Calculation Examples

Calculation Case Result
Creatinine 1.0, Age 45 (Male) eGFR > 90 (Normal)
Creatinine 1.8, Age 65 (Female) eGFR 30 (Moderate Decrease)
CKD-EPI Formula Current clinical gold standard

Clinical Application of the eGFR Calculator

The estimated Glomerular Filtration Rate (eGFR) is the primary indicator for kidney health. The tool utilizes the authoritative CKD-EPI equation to calculate your filtration rate, normalized to a body surface area of $1.73\text{ m}^2$. The results provide a clinical classification: Normal ($\ge 90$), Mildly Decreased ($60\text{--}89$), Moderately Decreased ($30\text{--}59$), or Severely Decreased ($< 15$).

Methodology and Scientific Standards

Our calculator implements the 2021 CKD-EPI creatinine equation, currently recognized as the most accurate non-invasive method for assessing adult renal function. In accordance with updated clinical guidelines from the National Kidney Foundation (NKF) and the American Society of Nephrology (ASN), this equation integrates serum creatinine, age, and sex without race-based coefficients to ensure equitable diagnostic accuracy. The CKD-EPI model demonstrates superior performance and higher clinical reliability compared to older formulas (such as MDRD), making it the preferred standard in modern nephrology.Clinical GFR Stages Chart

Useful Tips 💡

  • Always use the most recent serum creatinine value from a blood test.
  • Repeat the calculation every 3–12 months or as advised by your physician.

📋Steps to Calculate

  1. Enter your age, sex, and serum creatinine level.

  2. Select creatinine units (mg/dL or µmol/L).

  3. Click “Calculate” to see your eGFR result.

Mistakes to Avoid ⚠️

  1. Using non-African American formula for African descendants - overestimates GFR.
  2. Forgetting creatinine is in mg/dL in US but µmol/L elsewhere - conversion needed.
  3. Entering current weight instead of the weight used when creatinine was measured.
  4. Thinking eGFR > 90 is always perfect - early decline can be hidden.

Practical Applications📊

  1. Monitor kidney function trends during routine health checks.

  2. Compare your eGFR to normal values for your age group.

  3. Support early discussions with a doctor about kidney health.

Questions and Answers

What is an eGFR calculator?

An eGFR calculator determines the glomerular filtration rate that utilizes serum creatinine, age, and sex. It gives a fair assessment of kidney function and will recognize a potential decline before symptoms present.

How is normal GFR by age determined?

In young adults, a normal eGFR by age is often above 90 mL/min/1.73m² and tends to decrease slowly after 40 years of age. A value of 60-89 could still be considered "normal" in older individuals who have not otherwise progressed in kidney disease.

What does a low estimated glomerular filtration rate mean?

An estimated glomerular filtration rate of less than 60 for three months, or more may indicate chronic kidney disease. Values below this threshold indicate an impairment in kidney function and require follow-up with a physician.

Can I calculate eGFR without seeing a doctor?

YCertainly, the online eGFR calculator provides a solid estimate from standard inputs, but only a healthcare professional can interpret results in light of your complete medical history and possible additional tests.

Is the CKD-EPI formula suitable for everyone?

The CKD-EPI equation works well for most adults over 18. For children, pregnant women, or people with unusual muscle mass, alternative methods or direct measurement may be more appropriate.

What formula is used in the eGFR Calculator?

The eGFR calculator utilizes the CKD-EPI creatinine equation (2021): $\text{eGFR} = 142 \times \min(S_{cr} / \kappa, 1)^\alpha \times \max(S_{cr} / \kappa, 1)^{-1.200} \times 0.9938^{\text{Age}} \times [1.012 \text{ if Female}]$, where $S_{cr}$ is serum creatinine, $\kappa$ is $0.7$ for females or $0.9$ for males, and $\alpha$ is $-0.241$ for females or $-0.302$ for males. This race-free equation is endorsed by the National Kidney Foundation.

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Disclaimer: This calculator is designed to provide helpful estimates for informational purposes. While we strive for accuracy, financial (or medical) results can vary based on local laws and individual circumstances. We recommend consulting with a professional advisor for critical decisions.