GFR Calculator
Use the GFR Calculator to estimate your kidney function based on creatinine levels, age, gender, and race. Understand your kidney health easily online.
GFR Calculator:
The GFR Calculator helps estimate your kidney function using serum creatinine, age, sex, and race. By calculating the estimated GFR (eGFR), it identifies whether your kidneys are filtering blood normally, supporting early detection of chronic kidney disease and informing healthcare decisions.
Work & Installation — Input to Output Summary:
| Input | Description | Output |
|---|---|---|
| Serum Creatinine (Scr) | mg/dL or µmol/L | eGFR value (mL/min/1.73 m²) |
| Age | Years | eGFR adjusted for age |
| Sex | Male/Female | Sex adjustment factor |
| Race | Black/Other | Race adjustment factor |
| Units | mg/dL or µmol/L | Corrected Scr for formula |
GFR Calculator is a tool that estimates the level of kidney functioning by calculating your glomerular filtration rate (GFR). It relies on serum creatinine, age, sex, and occasionally, race to estimate GFR (eGFR) to identify early kidney disease or to check the health of the kidneys. The calculator uses the proven formula, like CKD-EPI or MDRD, and the The results are in mL/min/1.73m2, which are the measurements of the ability to filter waste by your kidneys. Normal GFR is determined to be more than 90, with lower ranges indicating low kidney functioning. Doctors and patients mostly use this A tool to monitor the health of the kidneys, make informed treatment choices, and regulate the dosages of medications. A A healthcare professional should at all times be able to interpret the results because such variables as muscle mass, hydration, and laboratory fluctuations may influence creatinine values.
Output Interpretation Example:
| eGFR (mL/min/1.73 m²) | Kidney Function |
|---|---|
| ≥90 | Normal |
| 60–89 | Mild decrease |
| 45–59 | Mild to moderate CKD |
| 30–44 | Moderate to severe CKD |
| 15–29 | Severe CKD |
| <15 | Kidney failure |
Testing and Final Adjustments
Test the GFR Calculator using different profiles, such as male/female, age, and range of creatinine. Make sure that unit conversions between µmol/L and mg/dL are correct. Ensure that the formula is using the right multipliers of sex and race. Output interpretations are validated to conform to standard stages of CKD. Add this: this is an approximation and is not to take the place of a medical assessment. Provide tooltips on every input, e.g., serum creatinine levels, age, and race considerations. Turn the calculator into a mobile one having numeric input along with a unit toggle. Displays abnormal values of GFR to draw attention. They should ensure the use of keywords in the headings, meta description, and result pages in a natural way.
CKD-EPI Formula (Adults, creatinine in mg/dL):
\[ eGFR = 141 \times min(\frac{Scr}{k},1)^{\alpha} \times Max(\frac{Scr}{k},1)^{-1.209} \times 0.993^{Age} \times 1.018^{[\textrm{if female}]} \times 1.159^{[\textrm{if Black}]} \]
- Scr = serum creatinine (mg/dL)
- κ = 0.7 (female) or 0.9 (male)
- α = −0.329 (female) or -0.411 (male)
- Age in years
Frequently Asked Questions - GFR Calculator:
What is a GFR calculator?
It estimates kidney function by calculating your estimated glomerular filtration rate using creatinine, age, sex, and race.
Why is GFR important?
GFR shows how well your kidneys filter waste; low GFR indicates reduced kidney function.
What inputs are needed?
Serum creatinine, age, sex, race, and unit of measurement (mg/dL or µmol/L).
What is a normal GFR?
A normal GFR is typically ≥90 mL/min/1.73 m²; lower values may indicate kidney disease.
Can GFR change with age?
Yes, GFR naturally declines with age, which is considered in the calculator formula.
Which formula is used?
The CKD-EPI formula is commonly used, though MDRD may also be applied.
Does muscle mass affect GFR?
Yes, high or low muscle mass can affect creatinine levels and thus estimated GFR.
Can this replace lab testing?
No, it provides an estimate; clinical tests are needed for accurate kidney function assessment.
Is race adjustment necessary?
Race factors are included to improve accuracy in certain formulas but are optional in newer guidelines.
Is the GFR calculator free?
Yes, most online GFR calculators are free and provide instant results.
