programmed by Stephen Z Fadem

Beta version


Male Female
Feet inches Centimeters
Check anthropometric equations
feet inches
Height in meters: xxx M
Weight in kg
Age in years


V24 hr urine: cc. Vurine = xxx liters
mg/dL mmol/L
Uurine urea nitrogen: ____
Pplasma urea nitrogen: ____

Measured in whole plasma (Europe)

RKC (uncorrected) : ???cc/min
RKC (Residual Kidney Urea Clearance): ??? cc/min/1.73m2


Vdialysate: Liters/24 hr
Udialysate urea: ____
Purea: ___
Cdialysate uncorrected: ??? L/week
Cdialysate: ??? L/week/1.72m2


kt/VWatson: ___
kt/VHume: ___
TBWWatson: ??? (anthropometric volume)
TBWHume: ???(anthropometric volume)
BSADubois: ??? (Body Surface Area)


  • Plasma Urea in USA is measured in Plasma Water. In Europe in Whole Plasma - correction factor = 1.07
  • RKC=V*U urea/Purea
  • RKCcc/min=RKC/1440
  • RKCcorrected=RKC*1.73/BSA;
  • RKCL/min=RKC/1000
  • RKCL/wk=RKCmin/cc*10080
  • Cdialysate=Durea*Vdialysate/Purea)*1.73/BSA
  • Kt/Vwk=(RKC+Cdialysate)/Vanthropometric
  • Alternatively Kt/Vweek=[(RKCuncorrected+Cdialysate - uncorrected)/V]*1.73/BSA
    • 10080=minutes/week =24 hours*7 days*60 min
    • 1440=minutes/24 hours
    • C=Clearance
    • P=Ureaplasma urea nitrogen
    • RKC = residual kidney function
    • D=dialysate
    • V = volume
    • U = urine


  1. K DOQI 2006 Updates
  2. Watson PE, Watson ID, Batt RD. Total body water volumes for adult males and females estimated from simple anthropometric measurements Am J Clin Nutr 33:27-39, 1980
  3. Hume R and Weyers E. Relationship between total body water and surface area in normal and obese subjects Clin Path 24(3):234-238, 1971
  4. DuBois D, DuBois EF.Clinical Calorimetry: Tenth Paper A formula to estimate the approximate surface area if the height and weight are known. Arch Intern Medicine. 17:863-71, 1916

© 2008-22, Stephen Z. Fadem, M.D., FASN. All rights reserved. No part of this application may be duplicated without written permission from the author.


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