Med Math Review for Dosage Calculation Exam 01
Type of question Formula
Order
Number of tablets
Supply
Number of mL (Order/Supply) * Total Volume
1. Dose*weight
mg/kg/day 2. (Order/Supply) * Total Volume
# of total doses
• Ratios are always expressed as grams:mL. 1:1000 = 1gram:1000mL 1:100 = 1 gram:100mL
• Gram . . . mg . . . mcg Move the decimal place to the left or the right three spaces to move
L L
between grams, milligrams and micrograms. Move eft for arger unit of measurement and
right for smaller unit of measurement. (Note: A larger unit of measurement will give a smaller
number and a smaller unit of measurement will give a larger number. Don’t let it confuse you.)
• 1 tsp = 5mL
• 1 tbsp = 3 tsp
• 1 oz = 30mL
• 1 kg = 2.2 lb
30 mL 1 oz
8 oz 1 cup
2 cups 1 pint
2 pints 1 quart
4 quarts 1 gallon
Just remember 30-8-2-2-4
Memorize this sheet
, Med Math Review for Dosage Calculation Exam 01
2
1. Order: Furosemide 80 mg PO every day. Supply: scored tablets 40 mg.
What is the quantity to administer? ___ tablets.
2. Order: Synthroid 0.15 mg PO every day. Supply: tablets of 300 mcg scored.
What is the quantity to administer? ___ tablets.
3. Order: Digoxin 0.125 mg PO every day. Supply: liquid labeled Digoxin 0.5
mg per 20 mL. What is the quantity to be administered? ___ mL.
4. Order: Mylanta 30 mL q4h PO prn. Supply: liquid labeled Mylanta 1 ounce.
What is the quantity to be administered? ___ fl oz.
5. Order: Epinephrine 0.4 mg subcutaneous stat. Supply: ampule labeled
1:1000 (2 mL size). What is the quantity to administer? ___ mL.
6. Order: Penicillin G procaine 600, 000 units IM q12h. Supply: vial labeled
500, 000 units/mL. What is the quantity to administer? ___ mL.
7. Order: Ampicillin 0.5 g IM q6h. Supply: vial of powder 500 mg. Dilute with
1.8 mL of sterile water to yield 250 mg/mL. What is the quantity to administer?
___ mL.
Type of question Formula
Order
Number of tablets
Supply
Number of mL (Order/Supply) * Total Volume
1. Dose*weight
mg/kg/day 2. (Order/Supply) * Total Volume
# of total doses
• Ratios are always expressed as grams:mL. 1:1000 = 1gram:1000mL 1:100 = 1 gram:100mL
• Gram . . . mg . . . mcg Move the decimal place to the left or the right three spaces to move
L L
between grams, milligrams and micrograms. Move eft for arger unit of measurement and
right for smaller unit of measurement. (Note: A larger unit of measurement will give a smaller
number and a smaller unit of measurement will give a larger number. Don’t let it confuse you.)
• 1 tsp = 5mL
• 1 tbsp = 3 tsp
• 1 oz = 30mL
• 1 kg = 2.2 lb
30 mL 1 oz
8 oz 1 cup
2 cups 1 pint
2 pints 1 quart
4 quarts 1 gallon
Just remember 30-8-2-2-4
Memorize this sheet
, Med Math Review for Dosage Calculation Exam 01
2
1. Order: Furosemide 80 mg PO every day. Supply: scored tablets 40 mg.
What is the quantity to administer? ___ tablets.
2. Order: Synthroid 0.15 mg PO every day. Supply: tablets of 300 mcg scored.
What is the quantity to administer? ___ tablets.
3. Order: Digoxin 0.125 mg PO every day. Supply: liquid labeled Digoxin 0.5
mg per 20 mL. What is the quantity to be administered? ___ mL.
4. Order: Mylanta 30 mL q4h PO prn. Supply: liquid labeled Mylanta 1 ounce.
What is the quantity to be administered? ___ fl oz.
5. Order: Epinephrine 0.4 mg subcutaneous stat. Supply: ampule labeled
1:1000 (2 mL size). What is the quantity to administer? ___ mL.
6. Order: Penicillin G procaine 600, 000 units IM q12h. Supply: vial labeled
500, 000 units/mL. What is the quantity to administer? ___ mL.
7. Order: Ampicillin 0.5 g IM q6h. Supply: vial of powder 500 mg. Dilute with
1.8 mL of sterile water to yield 250 mg/mL. What is the quantity to administer?
___ mL.
