Q = 0.70 (female), 0.90 (male) using mg/dL.
What is the EKFC calculator?
The EKFC calculator estimates eGFR (estimated glomerular filtration rate) using the European Kidney Function Consortium (EKFC) creatinine equation. eGFR is a standard way to estimate kidney filtration function from a blood creatinine result plus basic patient factors.
In practical terms, this calculator helps you convert a creatinine value into a more clinically useful number: mL/min/1.73m². That value can then be used for kidney function staging, medication dosing considerations, and longitudinal trend tracking.
How this calculator works
Inputs used
- Age (adult range)
- Sex assigned at birth (used to select Q)
- Serum creatinine (mg/dL or µmol/L)
Equation details
The adult EKFC creatinine equation normalizes creatinine by a sex-specific Q value (the population median reference creatinine), then applies an age adjustment after age 40. This creates a smooth and practical estimate in many routine clinical contexts.
If your lab reports creatinine in µmol/L, this page converts it to mg/dL before applying the formula (1 mg/dL = 88.4 µmol/L).
Interpreting your eGFR result
A single eGFR value is useful, but trends over time are usually more informative than one isolated measurement. Chronic kidney disease (CKD) is typically diagnosed using persistent abnormalities over at least 3 months, often with urine albumin data and clinical context.
| CKD G-Stage | eGFR (mL/min/1.73m²) | General Description |
|---|---|---|
| G1 | ≥ 90 | Normal/high (if no other kidney damage markers) |
| G2 | 60–89 | Mildly decreased |
| G3a | 45–59 | Mild to moderate decrease |
| G3b | 30–44 | Moderate to severe decrease |
| G4 | 15–29 | Severely decreased |
| G5 | < 15 | Kidney failure range |
Why people use an EKFC calculator
- To convert raw creatinine into a clinically interpretable kidney function estimate.
- To monitor kidney function trends over months and years.
- To support conversations about CKD staging and follow-up planning.
- To compare with prior lab reports that may use different eGFR equations.
EKFC vs other kidney equations
You may also see CKD-EPI or other formulas on lab reports. Different equations can produce slightly different eGFR values, especially near stage boundaries. The most important rule is consistency: compare trends using the same equation whenever possible.
Clinicians may also use cystatin C, combined creatinine-cystatin equations, urine albumin-to-creatinine ratio (ACR), imaging, and history to build a complete kidney assessment.
Frequently asked questions
Is a low eGFR always CKD?
Not always. CKD usually requires persistent findings over time. One low number can occur during temporary illness, fluid shifts, medication effects, or lab variation.
Can eGFR improve?
Yes, depending on cause. Some reductions are reversible (for example, dehydration). Other causes are chronic and managed through blood pressure control, diabetes care, medication review, and lifestyle steps.
Should I panic if my stage changes by one category?
Small shifts near category boundaries may reflect normal biological and lab variation. Discuss trends, repeat testing, and urine markers with your healthcare professional.
Bottom line
This EKFC calculator gives a quick, practical estimate of kidney function using adult creatinine data. Use it as a structured reference, not a diagnosis tool. For treatment decisions, pair the result with your full clinical picture and professional medical advice.