Calculator Input
Formula Used
eGFR = 142 × min(Scr/K, 1)α × max(Scr/K, 1)-1.200 × 0.9938Age × 1.012 (if female)
K = 0.7 for females, 0.9 for males
α = -0.241 for females, -0.302 for males
Scr = standardized serum creatinine in mg/dL
The calculator returns indexed eGFR in mL/min/1.73 m². If height and weight are entered, it also estimates body surface area and shows a de-indexed value for additional context.
This tool is for education and screening support. It does not replace clinical judgment, repeat testing, or emergency care.
How to Use This Calculator
- Enter the patient’s age in years.
- Select the biological sex used by the equation.
- Type the serum creatinine value exactly as the laboratory reported it.
- Choose the correct creatinine unit, either mg/dL or µmol/L.
- Optionally add urine ACR to improve kidney risk interpretation.
- Optionally add height and weight to estimate body surface area and de-indexed eGFR.
- Optionally enter a prior eGFR to measure directional change.
- Press the calculate button to show the result above the form, graph it, and export it.
Example Data Table
| Age | Sex | Creatinine | ACR | eGFR | GFR Category | Albuminuria |
|---|---|---|---|---|---|---|
| 28 | Female | 0.80 mg/dL | 12.00 mg/g | 102.86 | G1 | A1 |
| 46 | Male | 1.10 mg/dL | 18.00 mg/g | 83.84 | G2 | A1 |
| 62 | Female | 1.40 mg/dL | 95.00 mg/g | 42.54 | G3b | A2 |
| 74 | Male | 2.10 mg/dL | 420.00 mg/g | 32.42 | G3b | A3 |
These rows are illustrative examples generated by the same calculation logic used above.
Frequently Asked Questions
1) What does this calculator estimate?
It estimates glomerular filtration rate from serum creatinine, age, and sex. The result helps summarize kidney filtration status and place it into a standard G1 to G5 category.
2) Which equation is used here?
This page uses the adult CKD-EPI 2021 creatinine equation. It is a race-free approach commonly used for adult eGFR reporting from standardized laboratory creatinine values.
3) Does an eGFR below 60 always mean chronic kidney disease?
No. Chronic kidney disease generally depends on persistence over at least three months or other markers of kidney damage. One isolated result needs clinical context and often repeat testing.
4) Why are age and sex required?
The equation uses different coefficients for sex and adjusts for age-related change in filtration. Without those inputs, the estimate would not match the published CKD-EPI method.
5) Can I enter creatinine in µmol/L?
Yes. Choose µmol/L from the unit menu and the calculator converts the value to mg/dL before applying the equation. This keeps the displayed result consistent.
6) Why would I enter height and weight?
Those fields are optional. They allow the page to estimate body surface area and provide a de-indexed value, which can be helpful when body size context matters.
7) Is this calculator valid for children?
No. This page is built for adults. Pediatric kidney estimation usually uses different equations, so values for people younger than 18 should be assessed with child-specific methods.
8) Can a normal eGFR still miss kidney disease?
Yes. Albuminuria and other kidney-damage markers can matter even when eGFR is at least 60. That is why optional ACR entry is included for a more useful summary.