Creatinine Clearance Calculator (Cockcroft-Gault formula)

Weight kg    
Serum Creatinine μmol/L    

Calculated Creatinine Clearance: ml/min

Calculated as follows:

For male patients creatinine clearance ml.min = ( (140 − age) x ( weight in kg ) x 1.23 )
serum creatinine in umol/l
For female patients multiply the above by 0.85

Please Note
  • For patients who appear to be significantly overweight use their ideal body weight (Ideal body weight calculator) to work out their creatinine clearance
  • This calculator is based on the Cockcroft-Gault formula and is suitable for adults only.
  • Creatinine clearance is an estimation of GFR but, if the patient is morbidly obese, anuric or in acute renal failure this equation will not give a true reflection of GFR.
  • Do not use the eGFR reported on the Results Review biochemistry system for drug dosing purposes. Use creatinine clearance worked out using the Cockcroft-Gault formula above.