What Does Your Creatinine Clearance Result Mean?
Use this Creatinine Clearance Calculator to estimate how well your kidneys may be clearing creatinine from your blood. It uses the Cockcroft-Gault equation, which includes your age, weight, sex, and serum creatinine level.
Creatinine clearance is reported in milliliters per minute (mL/min). A lower result may suggest reduced kidney filtering, but this calculator does not diagnose kidney disease or replace lab review by a clinician.
Kidney function estimates can affect health conversations, but this calculator should not be used for medication dosing decisions without a clinician.
Estimated creatinine clearance
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This calculator is for general education only and is not a diagnosis, treatment plan, or substitute for care from a qualified health professional.
A creatinine clearance calculator estimates how much creatinine your kidneys may clear from your blood each minute. It commonly uses age, weight, sex, and serum creatinine to estimate kidney filtering. The result can support conversations about kidney health, but it does not diagnose kidney disease or replace lab review by a clinician.
The Cockcroft-Gault formula estimates creatinine clearance from age, body weight, serum creatinine, and sex. The equation is ((140 - age) × weight in kg) ÷ (72 × serum creatinine), then multiplied by 0.85 for female sex. The result is an estimate in mL/min, not a complete kidney evaluation.
Creatinine clearance and eGFR are related kidney function estimates, but they are not the same number. Creatinine clearance often uses the Cockcroft-Gault equation with weight, while many eGFR lab reports use CKD-EPI equations and may be indexed to body surface area. A clinician can explain which estimate matters for your situation.
A normal creatinine clearance result depends on age, sex, body size, muscle mass, and the method used. Many adults have lower estimates as they get older, and ranges vary by clinical context. Rather than relying on one cutoff, review the result with creatinine, eGFR, urine albumin, and your health history.
No, you should not use this calculator by itself for medication dosing decisions. Some medicines need kidney function review, but dosing depends on the medication, current labs, trends, body size, diagnosis, and clinician judgment. Always ask a healthcare professional before changing prescription or over-the-counter medicine use.
Weight and sex are included because the Cockcroft-Gault equation was designed to estimate creatinine clearance using factors linked with creatinine production and body size. Muscle mass also affects serum creatinine, so two people with the same creatinine level may have different estimates. This is one reason the result has limits.
Related kidney labs include serum creatinine, eGFR, blood urea nitrogen, BUN/creatinine ratio, and urine albumin/creatinine ratio. These markers look at different parts of kidney function and kidney stress. A clinician may also consider blood pressure, diabetes status, medications, hydration, and repeat testing over time.