HOSA Medical Math Test Study Guide

Basic dosage calculation formula

(desired dose ÷ amount on hand) × volume = dose [units/mL]

IV drop rate formula

(volume[mL] ÷ time[min]) × drop factor [gtts/ml] = flow rate [gtts/min]

IV mL rate formula

(volume[mL] ÷ time[hr]) = flow rate [mL/hr]

Dosage calculation by weight

weight (kg) × dosage (kg) = required dosage

Amount in IV fluid

(concentration % ÷ 100) × volume [mL] = dosage amount [g]

Body Surface Area (BSA) calculation metric

√(height [cm] × weight [kg]) ÷ 3600

Body Surface Area (BSA) calculation english

√(height [in] × weight [lb]) ÷ 3131

Normal Saline (NS)

0.9% NaCl

Degree conversion

°C=(oF-32) 5/9

°F=(oC)9/5 + 32

1 kilogram

1000 grams

1 gram

1000 milligrams

1 milligram

1000 micrograms

1 kilogram (weight)

2.2 pounds

1 pound (weight)

16 ounces

1 cubic meter

1000 cubic decimeters

1 cubic decimeter

1000 cubic centimeters

1 cubic centimeter

1000 cubic millimeters

1 liter

1000 milliliters

1 deciliter

10 centiliters

1 liter

10 deciliters

1 cubic centimeter

1 milliliter

240 milliliters

1 cup / 8 ounces / 16 tbsp

30 milliliters

1 ounce / 2 tbsp / 6 tsp

15 milliliters

1 tablespoon / 3 teaspoons

5 milliliters

1 teaspoon

1 milliliter

15 drops

0.0667 milliliters

1 drop

1 meter

39.4 inches

2.54 centimeters

1 in

Juice glass

6 oz

Coffee cup

8 oz

Water glass

7 oz

Jello cup

5 oz

Ice cream

4 oz

Creamer

1 oz