Calculation Formulas and Conversions

Question 1

1 teaspoon

Answer 1

5 ml

Question 2

1 tablespoon

Answer 2

15 mL

Question 3

1 fl oz

Answer 3

30 mL

Question 4

1 cup

Answer 4

8 oz, 240 mL

Question 5

1 pint

Answer 5

16 oz, 480 mL

Question 6

1 quart

Answer 6

2 pints, 960 mL

Question 7

1 gallon

Answer 7

4 quarts, 3840 mL

Question 8

1 kg

Answer 8

2.2 pounds

Question 9

1 oz

Answer 9

28.4 grams

Question 10

1 lbs

Answer 10

454 g, 16 oz

Question 11

1 grain

Answer 11

65 mg

Question 12

mEq to mmol

Answer 12

1:1 for monovalent ions
1:0.5 for divalent ions

Question 13

1 inch

Answer 13

2.54 centimeters

Question 14

1 meter

Answer 14

100 centimeters

Question 15

% w/v

Answer 15

X g / 100 mL

Question 16

% v/v

Answer 16

X mL/ 100 mL

Question 17

% w/w

Answer 17

X g / 100 g

Question 18

Percentage strength equation

Answer 18

% strength = 100 / ratio strength

Question 19

Ratio Strength equation

Answer 19

ratio strength = 100 / percentage strength

Question 20

PPM –> percentage strength

Answer 20

move decimal left 4 places

Question 21

Percentage strength–> PPM

Answer 21

move decimal right 4 places

Question 22

specific gravity equation

Answer 22

SG= weight of substance (g)/ weight of equal volume of water (g)
OR
SG= g/ mL

Question 23

Dilution & concentration (changing strength or quantity)

Answer 23

Q1 x C1 = Q2 x C2
Q1=old quantity
C1= old concentration
Q2= new quantity
C2 = new concentration

Question 24

osmolarity

Answer 24

mOsmol/L = (wt of substance (g/L) / WV (g/mole) ) x (# of particles) x 1000

Question 25

isotonicity (e value)

Answer 25

E= (58.5)(i)/ (MW of drug)(1.8)

Question 26

mols

Answer 26

mols= g/MW

Question 27

mmols

Answer 27

mmols= mg/MW

Question 28

miliequivalents

Answer 28

mEq = (mg x valence)/ MW
OR
mEq= mmols x valence

Question 29

enteral nutrition calories (carbs, protein, fat)

Answer 29

carbs, protein= 4 kcal/gram
fat = 9 kcal/ gram

Question 30

Dextrose monohydrate calories

Answer 30

3.4 kcal/g

Question 31

amino acid solutions calories

Answer 31

4 kcal/g

Question 32

ILE 10% calories

Answer 32

1.1 kcal/mL

Question 33

ILE 20% calories

Answer 33

2 kcal/mL

Question 34

ILE 30 % calories

Answer 34

3 kcal/mL

Question 35

determining fluid needs equation

Answer 35

when weight > 20 kg:
1500 mL + (20 mL)(weight in kg-20)
*Can estimate using 30-40 mL/kg/day

Question 36

Total energy expenditure

Answer 36

TEE = BEE x activity factor x stress factor

Question 37

grams of nitrogen from protein

Answer 37

nitrogen (g) = protein intake (g) / 6.25

Question 38

corrected calcium for albumin < 3.5 (not needed with ionized Ca)

Answer 38

Ca corrected(mg/dL) = calcium (reported, serum) + [(4.0-albumin)x(0.8)]

Question 39

Body mass index

Answer 39

BMI (kg/m2) = weight (kg)/ [height(m)]^2
OR
weight (lbs)/[height (inches)]^2 x 703

Question 40

ideal body weight (males)

Answer 40

IBW= 50 kg + (2.3 kg)(number of inches over 5 feet)

Question 41

ideal body weight (females)

Answer 41

IBW= 45.5 kg + (2.3kg)(number of inches over 5 feet)

Question 42

adjusted body weight

Answer 42

AdjBW 0.4= IBW + 0.4(TBW-IBW)

Question 43

flow rates/ drop factor

Answer 43

(# drops/mL) x (mL/hr) x (hr/60 min) = (# drops/ min)

Question 44

dehydration ratio

Answer 44

BUN:SCr > 20:1