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Creatinine Clearance (Cockcroft-Gault)

CrCl estimate. Free online Creatinine Clearance (Cockcroft-Gault). Calculate creatinine clearance (cockcroft-gault) online — fast, accurate, mobile-friendly, no

CrCl (mL/min)
70.707071

Derivation

  1. ├── 01Givenage = 60, w = 70, scr = 1.1, female = 0
  2. ├── 02Formula(140-e.age) × e.w / (72 × e.scr) × ("1"===e.female?.85:1)
  3. ├── 03Substitute(140-e.60) × e.70 / (72 × e.1.1) × ("1"===e.'0'?.85:1)
  4. └── 04Compute CrCl (mL/min)70.707071
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§01What is

Understanding the Creatinine Clearance (Cockcroft-Gault)

The Creatinine Clearance (Cockcroft-Gault) computes CrCl (mL/min) from 4 inputs: age, weight (kg), cr (mg/dl), female. CrCl estimate.

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 Creatinine Clearance (Cockcroft-Gault) sits in that toolkit — it crCl estimate. 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

(140-e.age) × e.w / (72 × e.scr) × ("1"===e.female?.85:1)

Where

age
Age
w
Weight (kg)
scr
Cr (mg/dL)
female
Female — one of: No, Yes
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Age = 60, Weight (kg) = 70, Cr (mg/dL) = 1.1, Female = 0.

  1. 01Start by noting the input — Age: 60.
  2. 02Start by noting the input — Weight (kg): 70.
  3. 03Start by noting the input — Cr (mg/dL): 1.1.
  4. 04Start by noting the input — Female: 0 (a category, not a number).
  5. 05Substitute these values into the formula: (140-e.age) × e.w / (72 × e.scr) × ("1"===e.female?.85:1)
  6. 06Compute CrCl (mL/min): the calculator returns 70.7071.
  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 Creatinine Clearance (Cockcroft-Gault) 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

Age halved

age = 30 (from 60)

Keep every other input at its default and halve the age. See how crcl (ml/min) responds.

  1. 01New Age: 30
  2. 02Baseline CrCl (mL/min): 70.7071
  3. 03New CrCl (mL/min): 97.2222
  4. 04CrCl (mL/min) increases by 37.5% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Age doubled

age = 120 (from 60)

Keep every other input at its default and double the age. See how crcl (ml/min) responds.

  1. 01New Age: 120
  2. 02Baseline CrCl (mL/min): 70.7071
  3. 03New CrCl (mL/min): 17.6768
  4. 04CrCl (mL/min) decreases by 75% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Weight (kg) halved

w = 35 (from 70)

Keep every other input at its default and halve the weight (kg). See how crcl (ml/min) responds.

  1. 01New Weight (kg): 35
  2. 02Baseline CrCl (mL/min): 70.7071
  3. 03New CrCl (mL/min): 35.3535
  4. 04CrCl (mL/min) decreases by 50% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Weight (kg) doubled

w = 140 (from 70)

Keep every other input at its default and double the weight (kg). See how crcl (ml/min) responds.

  1. 01New Weight (kg): 140
  2. 02Baseline CrCl (mL/min): 70.7071
  3. 03New CrCl (mL/min): 141.414
  4. 04CrCl (mL/min) increases by 100% → 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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