Creatine Clearence Calculator



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A creatinine clearance calculator provides a simple way to estimate filtration rate based on key inputs, quantifying kidney efficiency. Learn what creatinine measurement signifies and how physicians utilize this essential assessment tool.

Why Estimate Creatinine Clearance?

✔️ Chronic kidney disease

✔️ Acute kidney injury

✔️ Diabetes complications

✔️ Hypertension issues

✔️ Urinary tract obstructions

What is Creatinine?

Creatinine refers to a waste product naturally produced by muscles and filtered out of the bloodstream primarily by the kidneys. By measuring blood creatinine levels, doctors gauge kidney performance. Higher than normal concentrations signal reduced filtration.

Creatinine Clearance Formula

The commonly used formula for calculating estimated creatinine clearance is the Cockcroft-Gault equation:

Creatinine Clearance = (140 - Age) x Mass (kg) x (0.85 if female) / 72 x Serum Creatinine (mg/dL)

Breaking this down:

  • Age is in years
  • Mass is weight in kg
  • Serum Creatinine from blood test in mg/dL
  • The constant 72 represents the scaling factor
  • 0.85 adjustment applied for female gender

This generates creatinine clearance in mL/min to quantify the kidney filtration rate.

For example - 65 year old female, 64 kg, SCr 1.1 mg/dL

(140 - 65) x 64 x 0.85 / 72 x 1.1

= 75 x 64 x 0.85 / 79.2

= 51 mL/min

So for this sample 65-year-old woman with a body weight of 64 kg and blood creatinine level of 1.1 mg/dL, her estimated creatinine clearance would equal 51 mL/min based on the Cockcroft-Gault formula.

Normal Creatinine Clearance By Age

Clearance rate indicates the volume of blood scrubbed of creatinine wastes per minute scaled relative to body size.

Typical creatinine clearance rates by age and gender:


Age 20-60

Age > 60


80-120 mL/min

64-104 mL/min


80-120 mL/min

54-90 mL/min

  • Results below range require further assessment
  • Values decline naturally with older age

Doctors also translate clearance into estimated Glomerular Filtration Rate (eGFR) for easy staging.

How the Calculator Works

The creatinine clearance computation requires 4 inputs:

  1. Select Gender
  2. Enter weight
  3. Input age
  4. Provide serum creatinine level from blood test

Based on this data, the calculator produces an estimated milliliter per minute (mL/min) filtration rate by applying proven equations.

Higher clearances signify better kidney functioning.

Factors Impacting Creatinine Levels

Additional variables that modify creatinine concentrations include:

  • Muscle mass - more muscular people produce more creatinine
  • Protein intake - high protein diets increase creatinine
  • Medications - certain drugs influence kidney function
  • Hydration status - dehydration concentrated urine temporarily

Accounting for these when interpreting clearance maximizes the accuracy of kidney assessment.

Frequently Asked Questions (FAQs)

Q1: What is creatinine clearance?

Creatinine clearance is a test that measures how well the kidneys are filtering waste product creatinine from the blood.

Q2: How is creatinine clearance calculated?

Creatinine clearance is calculated using a formula that takes into account the creatinine levels in the urine and blood, as well as the volume of urine produced over a specific time period.

Q3: Why is creatinine clearance important?

Creatinine clearance is important as it provides an estimate of kidney function. It helps in diagnosing and monitoring conditions related to kidney health, such as chronic kidney disease.


Quickly determining creatinine clearance rates through an automated online calculator provides both patients and doctors with an accessible health monitoring tool for the early detection of declining kidney function.

Please note, that the calculator is for entertainment only. Consult a medical specialist for accurate assessments.

Read More: Creatinine Clearance Test: Purpose, Levels & Results

                     What Is A Creatinine Clearance Calculator