HOSA Medical Math Complete 2025

KHDBDCM

Kilo, Hecto, Deca, Base, Deci, Centi, Milli

1 meter to in

multiply by 39.37

in to cm

multiply by 2.54

1 ft to in

12 in

3 ft to yards

1 yard

1 mile to ft

5280 ft

1 pint to oz

16 oz

1 quart to pint

2 pts

1 gallon to pints

8 pts

1 gallon to quarts

4 qts

lbs (regular) to ounces

16 oz

lb to kg

1 lb to 2.2 kg

1 oz to tbsp

2 tbsp

1 tbsp to g

15 g

1 tbsp to tsp

3 tsp

1 tsp to mL

5 mL

8 fluidrachms/dram (dr) to oz/grains

1 fluid oz, 60 grians

60 minims (min) to dr

1 dr

1 oz to drachms

8 dr

1 dr to scruples

3 s. ap. (℈)

1 ℈ to grains

20 grains (gr)

BSA metric

√((height in cm) * (weight Kg))/3600

BSA English/US

√((height in in) * (weight in lb))/3131

juice glass to oz

6 oz

1 tea cup (c) to oz

6 oz

1 Measuring Cup (C) to oz

8 oz

1 pound (lb) apothecary system

12 oz

drops to minim

1 gtt to 1 minim (drop)

coffee cup to oz

8 oz

water glass to oz

7 oz

Jello Cup to oz

5 oz

Creamer to oz

1 oz

Ice cream to oz

4 oz

PO

by mouth

SR

sustained release

XL

extended release

SL

sublingual

IM

Intramuscular

SC

subcutaneous

IV

Intravenous

IC

Intracardiac

ID

Intradermal

q4h

once every 4 hours

q6h

once every 6 hours

qd

once a day

bid

twice a day

tid

three times a day

qid

four times a day

Celsius to Fahrenheit

C = (F-32)*5/9

Fahrenheit to Celsius

F = (C)*9/5 + 32

IV Flow Rate mL/hr

Total Volume (mL) / Total Time (hr)

IV Flow Rate gtt/min

(Total Volume (mL) / Total Time (min)) * Drop Factor

What is cm for

everything other than blood pressure

What is mm for

blood pressure

Electronic Infusion Pump: Formula for mL/hr

amount of solution/minutes to give = (mL/hr)/60 min

basic dose calculation formula

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

dose calculation by weight

dose (mL) = weight (kg) × dosage (mL/kg)

Young's rule

child's dose (mL) = {child's age (yr) ÷ [child's age (yr) + 12]} × adult dose (mL)

Fried's rule

infant's dose (mL) = [age (months) ÷ 150] × adult dose (mL)

household Clark's rule

child's dose (mL) = [child's weight (lbs) ÷ 150 lbs] × adult dose (mL)

metric Clark's rule

child's dose (mL) = [child's weight (kg) ÷ 68 kg] × adult dose (mL)

child's dose calculation from BSA

child's dose (mL) = [child's BSA (m²) ÷ 1.7m²] × adult dose (mL)

Normal Saline (NS)

0.9% NaCl

Amount in IV Fluid

dosage amount (g) = concentration (%) × volume (mL)

concentration of same solution

amount of solute ÷ amount of 1st solution = amount of solute ÷ amount of 2nd solution

fluid maintenance requirement 0-10 kg

required daily fluid (mL) = 100mL/kg × infant's weight (kg)

fluid maintenance requirement 10-20 kg

required daily fluid (mL) = 1000mL + 50mL/kg × infant's weight above 10kg (kg)

fluid maintenance requirement 20-70 kg

required daily fluid (mL) = 1500mL + 20mL/kg × infant's weight above 20kg (kg)

fluid maintenance requirement over 70kg

2500mL (adult requirement)

standard deviation

s = √[ ∑(x - mean)² / (n-1) ]

1 milligram to microgram

1000 mcg (µg)

microdrip rate (no IV infusion controller)

60 gtts/mL

Dilution equation

M₁V₁ = M₂V₂, with M = initial/final molarity and V = initial/final volumes

I

1

V

5

X

10

L

50

C

100

D

500

M

1,000

Basic unit of length

Meters

Basic unit of volume

Liters

Basic unit of weight

Gram