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eGFR (MDRD) Calculator

Estimated GFR by MDRD. Free online eGFR (MDRD) Calculator. Calculate egfr (mdrd) online — fast, accurate, mobile-friendly, no signup needed.

eGFR
82.759883

Derivation

  1. ├── 01Givenscr = 1, age = 40, female = 0, black = 0
  2. ├── 02Formula175 × (t)^(-1.154) × (a)^(-.203) × ("1"===n?.742:1) × ("1"===r?1.212:1)
  3. └── 03Compute eGFR82.759883
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§01What is

Understanding the eGFR (MDRD) Calculator

The eGFR (MDRD) Calculator computes eGFR from 4 inputs: serum creatinine (mg/dl), age, female, african-american. Estimated GFR by MDRD.

Health metrics give us objective checkpoints against a body that can feel unreliable. Used alongside professional guidance — not in place of it — these numbers help you track progress and spot trends that matter. The eGFR (MDRD) Calculator sits in that toolkit — it estimated GFR by MDRD. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

175 × (t)^(-1.154) × (a)^(-.203) × ("1"===n?.742:1) × ("1"===r?1.212:1)

Where

scr
Serum creatinine (mg/dL)
age
Age
female
Female — one of: No, Yes
black
African-American — one of: No, Yes
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Serum creatinine (mg/dL) = 1, Age = 40, Female = 0, African-American = 0.

  1. 01Start by noting the input — Serum creatinine (mg/dL): 1.
  2. 02Start by noting the input — Age: 40.
  3. 03Start by noting the input — Female: 0 (a category, not a number).
  4. 04Start by noting the input — African-American: 0 (a category, not a number).
  5. 05Substitute these values into the formula: 175 × (t)^(-1.154) × (a)^(-.203) × ("1"===n?.742:1) × ("1"===r?1.212:1)
  6. 06Compute eGFR: the calculator returns 82.7599.
  7. 07Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common eGFR (MDRD) Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Serum creatinine (mg/dL) halved

scr = 0.5 (from 1)

Keep every other input at its default and halve the serum creatinine (mg/dl). See how egfr responds.

  1. 01New Serum creatinine (mg/dL): 0.5
  2. 02Baseline eGFR: 82.7599
  3. 03New eGFR: 184.166
  4. 04eGFR increases by 122.5% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Serum creatinine (mg/dL) doubled

scr = 2 (from 1)

Keep every other input at its default and double the serum creatinine (mg/dl). See how egfr responds.

  1. 01New Serum creatinine (mg/dL): 2
  2. 02Baseline eGFR: 82.7599
  3. 03New eGFR: 37.1904
  4. 04eGFR decreases by 55.1% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Age halved

age = 20 (from 40)

Keep every other input at its default and halve the age. See how egfr responds.

  1. 01New Age: 20
  2. 02Baseline eGFR: 82.7599
  3. 03New eGFR: 95.264
  4. 04eGFR increases by 15.1% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Age doubled

age = 80 (from 40)

Keep every other input at its default and double the age. See how egfr responds.

  1. 01New Age: 80
  2. 02Baseline eGFR: 82.7599
  3. 03New eGFR: 71.897
  4. 04eGFR decreases by 13.1% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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