Math & Conversions formulas

1 teaspoon (tsp) to mL

5 mL

1 tablespoon (tbsp) to mL

15 mL

1 fluid ounce (fl oz) to mL

30 mL

1 cup to ounces and mL

8 oz | 240 mL

1 pint (pt) to mL

480 mL

1 quart (qt) to mL

960 mL

1 gallon (gal) to mL

3840 mL

1 kilogram (kg) to pounds (lbs)

2.2 lbs

1 pound (lb) to grams (g)

454 g

1 grain (gr) to milligrams (mg)

65 mg (or 60 mg for thyroid/aspirin)

1 ounce (oz) to grams (g)

28.35 g

Celsius to Fahrenheit Formula

°F = (°C × 1.8) + 32

Fahrenheit to Celsius Formula

°C = (°F - 32) ÷ 1.8

Roman Numeral: I / V / X

I = 1 | V = 5 | X = 10

Roman Numeral: L / C / D / M

L = 50 | C = 100 | D = 500 | M = 1000

Days Supply Formula

Days Supply = Total Quantity Dispensed ÷ Total Quantity Used Per Day

Flow Rate (mL/hr) Formula

Flow Rate = Total Volume (mL) ÷ Total Time (hours)

Infusion Time (hours) Formula

Infusion Time = Total Volume (mL) ÷ Flow Rate (mL/hr)

Drip Rate (gtts/min) Formula

Drip Rate = [Total Volume (mL) × Drop Factor (gtts/mL)] ÷ Total Time (minutes)

Alligation Method Purpose

Used to mix two different strengths of the same drug to get a desired middle strength

Young's Rule (Child Dose by Age)

Child Dose = [Age ÷ (Age + 12)] × Adult Dose

Clark's Rule (Child Dose by Weight)

Child Dose = (Weight in lbs ÷ 150) × Adult Dose

Fried's Rule (Infant Dose by Months)

Infant Dose = (Age in months ÷ 150) × Adult Dose

Dilution Formula (C1V1 = C2V2)

Initial Concentration × Initial Volume = Final Concentration × Final Volume