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Creatinine Clearance Calculator

Estimate creatinine clearance with the Cockcroft-Gault formula. Supports actual, ideal (Devine), and adjusted body weight, plus mg/dL and umol/L creatinine.

Patient details

For adults age 18 and older. Use a pediatric kidney function equation for younger patients.

Typical adult range is about 0.6 to 1.3 mg/dL (53 to 115 umol/L).

Adjusted body weight is used when the patient is obese (BMI above 30). Otherwise the calculator falls back to actual weight.

Creatinine clearance (Cockcroft-Gault)

83.2 mL/min

CKD stage not assigned

Cockcroft-Gault CrCl is a single estimate used mainly for drug-dosing context. BSA-normalized CrCl is shown when height is available, but neither value diagnoses chronic kidney disease or assigns a CKD stage.

Weight used
176 lb
Weight basis
actual body weight
BMI
26
BSA-normalized (Du Bois)
73.5 mL/min/1.73 m²

Medical disclaimer

This calculator gives an estimate using the Cockcroft-Gault formula (1976). It is not a diagnosis and not medical advice. Cockcroft-Gault overestimates kidney function in obese, edematous, or frail patients, and a single creatinine reading can vary with hydration, diet, muscle mass, and recent exercise. Drug dosing decisions belong with a clinician or pharmacist who can weigh trends over time, urine albumin, and the full clinical picture.

Cockcroft-Gault Weight Options

The calculator can apply actual, ideal, or adjusted body weight before estimating creatinine clearance.

Weight optionExample valueFormula useWhen selected
Actual body weight100 kgDirectly in equationActual option
Ideal body weight70 kgDirectly in equationIdeal option
Adjusted body weight82 kg from 100 kg actual and 70 kg IBWIBW + 0.4 × excessBMI above 30

Cockcroft-Gault is a medication-dosing estimate. Follow the weight convention and renal dosing guidance for the specific drug.

Frequently Asked Questions about the Creatinine Clearance Calculator

What formula does this calculator use?
The Cockcroft-Gault equation from 1976: CrCl (mL/min) = ((140 - age) x weight_kg x sex_factor) / (72 x serum_creatinine_mg_dL), where the sex factor is 1.00 for men and 0.85 for women. Many drug package inserts still anchor their dose adjustments to Cockcroft-Gault.
Should I use actual, ideal, or adjusted body weight?
The weight choice is protocol-dependent. Actual body weight is often used when body size is not extreme, while some drug-dosing protocols use adjusted or lean weight in obesity. Ideal body weight is not a general rule for an underweight patient. Follow the medication's labeling or your pharmacy protocol, because the selected weight can materially change Cockcroft-Gault clearance.
Why does this calculator also show a BSA-normalized result?
Cockcroft-Gault reports raw mL/min, while CKD-EPI eGFR reports mL/min per 1.73 m^2. When you enter a height, this calculator also shows a BSA-normalized creatinine-clearance estimate. Neither result diagnoses chronic kidney disease or assigns a CKD stage from one measurement. A clinician interprets trends, duration, urine findings, and the clinical context.
How do I convert creatinine from umol/L to mg/dL?
Divide umol/L by 88.4 to get mg/dL. So 88.4 umol/L equals 1.0 mg/dL. The 88.4 factor comes from creatinine's molecular weight (113.12 g/mol) and dL-to-L conversion. Most countries outside the US report creatinine in umol/L.
Is this a medical diagnosis?
No. This is a screening estimate. Cockcroft-Gault was derived in a small, hospitalized, mostly male population and is known to overestimate kidney function in obese, edematous, or sarcopenic patients and underestimate it in muscular ones. Use the result only as a conversation starter with your clinician.

Changelog

Updates to Creatinine Clearance Calculator, grouped by date.

1 update

  1. Creatinine Clearance Calculator added

    • Estimate creatinine clearance with the Cockcroft-Gault formula. Supports actual, ideal (Devine), and adjusted body weight, plus mg/dL and umol/L creatinine.

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