Calculations I

1 teaspoon(tsp/t)

5 ml

1 tablespoon(tbsp/T)

15ml

1 fluid ounce

30ml

1 cup ounce

8 oz or 240ml

1 pint

16oz or 480ml

1 quart

2 pints, 960ml

1 gallon

4 quarts or 3840ml

1 kg

2.2lbs

1 oz

28.4 g

1 pound(lb)

454 g or 16 oz

1 grain(gr)

65mg

1 inch

2.54 cm

1 meter

100 cm

What does qs a.d represent?

total volume to be made

What does M. .ft represent?

Mix and make ___ of product

How to solve problems that use ratios?

1. Convert ratio into parts( i.e ½ -→ 1 part/2 parts)

2. take the sum of the parts and find out how much is per part

3. calculate the amount for each component

mEq & mmol for monovalent ions( K+, Na+, etc.)

1mEq=1mmol

mEq & mmol for divalent ions( Ca++, etc.)

1 mEq= 0.5 mol

How to round

Always Round at the last step

• if it says round to the nearest number:

  • i.e 205.45 mg →205

• if it says round to the nearest tenth: round to once decimal place

• round to the nearest 10mg

  • i. 56.5 mg →60mg

Metric conversions for weight

Metric conversions for volume

Decimal and percentage conversions

From decimal to percent: multiply by 100

From percent to decimal: divide by 100

Order of operations

From left to right

1. Brackets→Parantheses

2. Exponents—>Multiplication and Division—>Addition and Subtraction