eGFR Kidney Function
This uses the 2021 CKD-EPI equation. Raw creatinine swings with muscle mass, so it has to be adjusted for age and sex to approximate how much the kidneys filter per minute. Ninety and above is normal; sustained values under sixty fall into chronic kidney disease.
Your numbers
eGFR
100.9
Creatinine (mg/dL)
0.9
Percentage
101%
What it means
100.9 is in the normal range (90 or above).
Formula
eGFR = 142 × (Creatinine (mg/dL) ÷ κ) ^ α × 0.9938 ^ Age × f(Sex (M1 / F0))
The equation drifts at very high or very low muscle mass. This is a reading aid, not a diagnosis — interpret it with a clinician.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Creatinine (mg/dL)A muscle waste product the kidneys clear, which makes it a kidney marker. | 0.9 | 0.1 ~ 15 |
| AgeAge in completed years — it shifts by one depending on the birthday. | 55 | 18 ~ 100 |
| Sex (M1 / F0)Where the formula splits by sex — enter 1 for male, 0 for female. | 1 | 0 ~ 1 |
Step by step
Quick reference table
Results when only Age changes and everything else stays put.
| Age | eGFR | Creatinine (mg/dL) | Percentage (%) |
|---|---|---|---|
| 27.5 | 119.7 | 0.9 | 120 |
| 41.3 | 109.8 | 0.9 | 110 |
| 55 | 100.9 | 0.9 | 101 |
| 82.5 | 85 | 0.9 | 85 |
| 100 | 76.2 | 0.9 | 76 |
What each result means
| Result | At default values |
|---|---|
| eGFREstimated millilitres filtered per minute; 90 or above is normal. | 100.9 |
| Creatinine (mg/dL)A muscle waste product the kidneys clear, which makes it a kidney marker. | 0.9 |
| Percentage (%)A share expressed out of 100. | 101 |
Common mistakes
The equation drifts at very high or very low muscle mass. This is a reading aid, not a diagnosis — interpret it with a clinician.
Glossary
- Creatinine (mg/dL)
- A muscle waste product the kidneys clear, which makes it a kidney marker.
- Age
- Age in completed years — it shifts by one depending on the birthday.
- Sex (M1 / F0)
- Where the formula splits by sex — enter 1 for male, 0 for female.
- eGFR
- Estimated millilitres filtered per minute; 90 or above is normal.
- Percentage
- A share expressed out of 100.
Frequently asked questions
Q. How is eGFR Kidney Function calculated?
eGFR = 142 × (Creatinine (mg/dL) ÷ κ) ^ α × 0.9938 ^ Age × f(Sex (M1 / F0)) — This uses the 2021 CKD-EPI equation. Raw creatinine swings with muscle mass, so it has to be adjusted for age and sex to approximate how much the kidneys filter per minute. Ninety and above is normal; sustained values under sixty fall into chronic kidney disease.
Q. Can you walk through an example?
With Creatinine (mg/dL) 0.9, Age 55, Sex (M1 / F0) 1, the answer is eGFR 100.9.
Q. What do I need to enter?
Enter Creatinine (mg/dL), Age, Sex (M1 / F0). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Age moves the answer to Age 27.5 → eGFR 119.7 and Age 100 → eGFR 76.2. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The equation drifts at very high or very low muscle mass. This is a reading aid, not a diagnosis — interpret it with a clinician.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.