Health & Fitness

GFR Calculator

Estimates glomerular filtration rate with the MDRD equation from serum creatinine, age and sex, applying a 0.742 factor for females. The result is shown to one decimal in mL/min/1.73m2.

What this calculator does

The GFR Calculator estimates your result instantly from the values you enter, using standard health & fitness formulas. Estimates glomerular filtration rate with the MDRD equation from serum creatinine, age and sex, applying a 0.742 factor for females. The result is shown to one decimal in mL/min/1.73m2. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.

GFR Calculator

Result

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eGFR (mL/min/1.73m2)

About GFR Calculator

The GFR Calculator estimates kidney filtration rate using the MDRD equation: 175 x creatinine^-1.154 x age^-0.203, multiplied by 0.742 for females. It takes serum creatinine in mg/dL, age and sex, and reports eGFR to one decimal place in mL/min/1.73m2.

Formula & Mathematical Calculation

eGFR (mL/min/1.73m2) = f(Sex, Age (years), Serum Creatinine (mg/dL))

Calculated according to standard health formulas implemented in the calculator core.

Calculation Example

For a male, age 50, serum creatinine 1 mg/dL: eGFR = 175 x 1^-1.154 x 50^-0.203, which the tool shows as eGFR = 79.1, with the note: "MDRD estimated GFR is about 79.1 mL/min/1.73 square meters."

Key Benefits

  • Implements the MDRD estimating equation for eGFR
  • Applies the female adjustment factor of 0.742 automatically
  • Reports the result to one decimal place in standard mL/min/1.73m2 units

How to Use this Calculator

  1. Choose sex and enter age
    Select Male or Female and type your age in years (for example 50).
  2. Enter serum creatinine
    Type your serum creatinine in mg/dL into its field (for example 1).
  3. Calculate
    Click Calculate and read the eGFR result box.

Assumptions & Limitations

What the calculation assumes

  • Every value you enter is treated as an exact, known amount.
  • Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
  • Results use standard published formulas and account only for the values entered above.
  • Rounding is applied for display; the underlying calculation uses your full precision.
  • Results are returned in the same units you enter, unless the tool states the output unit.

What it does not cover

  • GFR Calculator produces a calculated result for reference and learning, not a certified or official measurement.
  • Real-world outcomes differ when tolerances, rounding rules or local standards apply.
  • Definitions and standards vary by region and change over time; verify the convention that applies to your case.
  • Figures are only as accurate as the inputs you supply — check them before acting on the result.
  • For work where the result carries real consequences, confirm it against an authoritative source.

Frequently Asked Questions

The MDRD equation: 175 x serum creatinine raised to -1.154 x age raised to -0.203, then multiplied by 0.742 if female.

For females the result is multiplied by 0.742, giving a lower eGFR than a male with the same creatinine and age.

Age and serum creatinine must both be positive; if either is zero or negative the tool shows an error instead of a result.

Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.