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# Math Formulas

### Pharmacy Calculations

When question asks for mL/hour. volume/time
When question asks for mL/hour and just gives total volume, gtts/min, and gtts/mL. time/volume x 60 minutes
When question asks to solve for gtts/min. volume/time x drop factor
When question asks for number of tablets, capsules, mLs..... need/have x quantity
When question asks for quantity or strength solve for x. strength/quantity = strength/quantity
2 BSA formulas are: cm x kg/3600 and in x lbs/3131
When question asks for amount to give patient when order says: strength/m2/day or hourly rate. strength x BSA = amount to give
m2 BSA
When question asks to solve for amount to give patient and you are given child's BSA and adult strength of medication. strength x BSA/1.7
When question asks for amount to give patient using order of strength/kg/day(hourly rate). strength x kilograms of body weight
Young's Rule age/age+years x adult dose
Clark's Rule weight/150 x adult dose
Freid's Rule. age/150 x adult dose
When question asks to dilute medication from a precent strength. initial strength/ final strength = initial volume/final volume
Large units to smaller units multiply
Small units to large units divide
Created by: creelynn