Creatinine Clearance Calculator
Check your kidney health in seconds. Use a clinically trusted formula to calculate Creatinine Clearance (CrCl) and estimate your kidney filtration rate (GFR) based on your age, weight, and blood creatinine level.
What is Creatinine Clearance?
Creatinine clearance (CrCl) is one of the most common metrics used in medicine to estimate the Glomerular Filtration Rate (GFR)—essentially, how well your kidneys are filtering waste from your blood. Creatinine is a chemical waste product generated from muscle metabolism. Healthy kidneys filter creatinine out of the blood and into the urine.
If your kidneys aren't functioning properly, the level of creatinine in your blood rises. This calculator helps translate that blood level into a flow rate (mL/min) to grade kidney health.
* For females, the result is multiplied by 0.85.
Why Use Our CrCl Calculator?
Medication Dosing
Many drugs require dosage adjustments based on CrCl.
Global Units Support
Auto-converts between mg/dL and µmol/L.
Instant Staging
Immediately see if results indicate mild, moderate, or severe impairment.
Free & Private
No data is stored. Calculations happen in your browser.
How to Interpret Your Results
Kidney function is often categorized into stages based on the GFR or Creatinine Clearance rate. While only a doctor can diagnose Chronic Kidney Disease (CKD), these ranges provide a general guideline.
| Clearance (mL/min) | Kidney Function Status | Description |
|---|---|---|
| 90 + | Normal | Kidneys are functioning normally. |
| 60 – 89 | Mild Impairment | Slight loss of function; observation needed. |
| 30 – 59 | Moderate Impairment | Moderate CKD; requires medical management. |
| 15 – 29 | Severe Impairment | Severe CKD; preparing for dialysis may be needed. |
| < 15 | Kidney Failure | End Stage Renal Disease (ESRD). |
How to Calculate (Step-by-Step)
Step 01
Get Your Blood Test Results
Locate your 'Serum Creatinine' level from your latest blood work.
Step 02
Enter Personal Details
Input your age, gender, and current weight.
Step 03
Select Units
Choose whether your creatinine is in mg/dL (US) or µmol/L (International).
Step 04
View Interpretation
Get your CrCl value and see which stage of kidney function it corresponds to.
1. Formula: ((140 - 60) × 75) / (72 × 1.2)
2. Numerator: 80 × 75 = 6,000
3. Denominator: 72 × 1.2 = 86.4
4. Result: 6,000 ÷ 86.4 = 69.4 mL/min
If this were a female, we would multiply 69.4 by 0.85 = 59.0 mL/min.
Important Medical Disclaimer
This calculator is a clinical tool intended for general information. It does not replace professional medical advice, diagnosis, or treatment. The Cockcroft-Gault formula may be less accurate for patients who are very elderly, obese, or have muscle wasting diseases. Always consult with a nephrologist or healthcare provider for interpretation of blood work.
Scientific References
Original Cockcroft-Gault Study (1976)
Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron. 1976;16(1):31-41.
→ View on PubMedNKF KDOQI Guidelines
National Kidney Foundation guidelines for evaluation and management of chronic kidney disease.
→ View on Kidney.org
Frequently Asked Questions
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