Understanding the creatinine clearance calculator
Estimate Cockcroft-Gault creatinine clearance and race-free 2021 CKD-EPI eGFR from adult inputs.
This page provides an equation-based estimate for education and planning. It does not diagnose a condition, measure an individual response, or replace professional care.
How to use this health calculator
- Choose appropriate inputs: Enter measurements using the units and ranges shown.
- Review the assumptions: Confirm that the model applies before interpreting the result.
- Calculate and interpret: Read the result together with its limitations and cautions.
- Use professional guidance when needed: Do not use a general calculator to change medication, treatment, or a clinician-directed plan.
Formula and variables
The output follows the stated arithmetic and assumptions; it is not an individualized diagnosis, prognosis, or treatment recommendation.
CrCl = (140 − age) × weight kg ÷ (72 × serum creatinine), × 0.85 for female; eGFR uses the 2021 CKD-EPI creatinine equation.- Scr — Serum creatinine
- Creatinine converted to mg/dL.
Worked example
A 50-year-old male weighs 70 kg with creatinine 1 mg/dL.
- Inputs
- Age 50, 70 kg, Scr 1 mg/dL
- Cockcroft-Gault: 90 × 70 ÷ 72 = 87.5 mL/min.
Result: Estimated creatinine clearance is 87.5 mL/min; eGFR is reported separately.
Interpret the result with its population, measurement, and clinical limitations.
Understanding your results
Equation result
The numerical output follows the displayed formula and entered assumptions.
Personal interpretation
Individual biology, measurement error, environment, health conditions and medicines can change real-world outcomes.
Assumptions
- Inputs are accurate and use the displayed definitions and units.
- The cited reference or equation applies to the intended educational comparison.
Limitations
- CrCl and indexed eGFR are not interchangeable.
- Acute kidney injury and unusual muscle mass reduce reliability.
- Weight selection for Cockcroft-Gault is a clinical decision.
Common mistakes
- Using µmol/L as though it were mg/dL.
- Diagnosing CKD from one estimate.
Practical use cases
Educational estimate
Explore how the inputs affect the equation result.
Consistent tracking
Compare estimates only when methods, units and conditions are consistent.
Planning and decision guide
Treat cautions as part of the result
Follow the kidney-function method required by the drug label or clinical protocol.
Escalate symptoms or clinical questions
Seek qualified medical advice for symptoms, diagnosed conditions, medicines, pregnancy, or individualized treatment decisions.
Frequently asked questions
Is this result individualized medical advice?
No. It is an educational calculation based on the displayed assumptions.
Can I use it to change treatment?
No. Treatment decisions require appropriate professional assessment.
Sources and review
- CKD-EPI Creatinine Equation (2021) — National Kidney Foundation. Accessed 2026-08-03.
Reviewed 2026-08-03.