eGFR Calculator (MDRD Equation)
Estimate kidney filtration rate from creatinine.
Enter your values
Enter the serum creatinine in mg/dL.
Enter the age in years.
Choose one of: Male, Female.
Choose one of: Other, Black.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- eGFR
- 80.8 mL/min/1.73m²
- CKD stage estimate
- Mildly reduced (Stage 2)
Quick answer
eGFR estimates kidney function from serum creatinine adjusted for age, sex and race using the MDRD equation.
eGFR = 175 x Scr^-1.154 x age^-0.203 x 0.742 (if female) x 1.212 (if Black)
At a glance
| What it does | Estimate kidney filtration rate from creatinine. |
|---|---|
| Category | Health |
| Inputs needed | Serum creatinine, Age, Sex, Race |
| Main output | eGFR |
| Formula | eGFR = 175 x Scr^-1.154 x age^-0.203 x 0.742 (if female) x 1.212 (if Black) |
| Cost | Free — no sign-up, no download |
How to use the eGFR Calculator (MDRD Equation)
- 1Enter serum creatinine from a recent lab result, along with age, sex and race as used by the MDRD equation.
- 2MDRD is one of several eGFR equations; newer race-free equations (CKD-EPI 2021) are now often preferred clinically.
- 3This is an estimate for educational purposes only — kidney function assessment and CKD staging must be done by a healthcare professional.
Inputs explained
- Serum creatinine(mg/dL)
- Enter the serum creatinine in mg/dL.
- Age(years)
- Enter the age in years.
- Sex
- Choose one of: Male, Female.
- Race
- Choose one of: Other, Black.
Worked example
Using the values the calculator loads with:
Inputs
- Serum creatinine1.0 mg/dL
- Age45 years
- SexMale
- RaceOther
Results
- eGFR80.8 mL/min/1.73m²
- CKD stage estimateMildly reduced (Stage 2)
Frequently asked questions
Why does race matter in this formula?
Older equations included a race coefficient; many labs have since moved to race-free equations for equity reasons.
Is a single eGFR reading enough for diagnosis?
No — CKD diagnosis typically requires abnormal results persisting for at least 3 months.
What do I need to enter into the eGFR Calculator (MDRD Equation)?
Just 4 values: serum creatinine, age, sex, race. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the eGFR Calculator (MDRD Equation) work out the answer?
eGFR estimates kidney function from serum creatinine adjusted for age, sex and race using the MDRD equation. It applies the formula eGFR = 175 x Scr^-1.154 x age^-0.203 x 0.742 (if female) x 1.212 (if Black) and shows the working so you can check each step by hand.
Is the eGFR Calculator (MDRD Equation) free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.