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Calculation Formulas
Formulas and their uses
| Question | Answer |
|---|---|
| Celsius to Fahrenheit, Fahrenheit to Celsius | C = F-32/1.8 or F = 1.8C + 32 |
| Oral Solid and Liquid doses using Ratio & Proportion | Known Ratio (Stock) = Unknown Ratio (Physician's Order) |
| Calculation of Parenteral Doses using Ratio & Proportion | Known Ratio (Stock) = Unknown Ratio (Physician's Order) |
| Calculations with Anticoagulants and Insulin | Known Ratio (Stock) = Unknown Ratio (Physician's Order) |
| Pounds to kilograms, Kilograms to pounds | # of pounds/2.2 pounds per kg, # of kg x 2.2 pounds per kg |
| Clark's Rule (Child's dose based on weight in lbs) | Child's dose = (Child's weight in lbs/150) x adult dose |
| Fried's Rule (Infant dose based on age in months) | Infant's dose = (Age in months x Adult dose)/150 |
| Young's Rule (Child's dose based on age in years) | Child's dose = (Age in years x adult dose)/Age in years + 12 |
| Calculating total dosage needed | Total dosage needed = Doses needed per day x number of days prescribed |
| Calculating number of doses in a container | Number of doses in container = Total amount of medication/dose size |
| Simple dilution of stock liquids | SV (Stock volume) × SS (Stock Strength)= DV (Desired volume) × DS (Desired strength) |
| Simple dilution of stock solids | SW (Stock weight) × SS (Stock strength) = DW (Desired weight) × DS (Desired Strength) |
| Alligation Alternate | Tic-tac-toe method, calculates the number of parts of two different percentage strengths that can be mixed together to prepare a third strength that is not available |
| Alligation Medial | Used to determine total percentage strength when two or more substances with known quantities and strengths are mixed |
| Calculating IV Infusion Rates | Infusion rate = Total volume to be infused (mL)/Time (hour, min) |
| Calculating Drip Rate (gtt/min) | Drip rate = Volume (mL) x Drop factor (gtt/mL)/Time (min) |
| Calculating Markup (Difference in purchase cost of drug and selling price) | Markup = Selling price - purchase cost |
| Calculating Markup Percentage | Markup Percentage = (Markup/Purchase cost) x 100% |
| Calculating Gross Income | Gross income = Sales - Cost of inventory |
| Calculating Net Income | Net income = Sales - (Inventory + overhead) |
| Calculating Reimbursement of prescription | Reimbursement of prescription = AWP + or - % of AWP allowed + Dispensing fee |
Created by:
tomknoah
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