Nursing math
Dosage calculation practice test
33 problems across 8 types. Write each line with its units. Lines are checked as you go; mark your final answer when you have it.
Practice only, not clinical advice. Made-up numbers for arithmetic practice. Never use this page to work out a real dose.
Solved 0 of 33 on this device.
- Oral tablets and capsules
- Oral liquids
- Weight-based doses
- IV rate in mL/hr
- IV drops per minute
- Infusion time
- Titration in mcg/kg/min
- Reconstitution
Oral tablets and capsules
Practice only, not clinical advice.
An order reads 750 mg by mouth. The tablets (scored, so they can be halved) on hand are labelled 250 mg per tab. How many tablets are given?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: tab. Write each line with its units.
Practice only, not clinical advice.
An order reads 0.5 g by mouth. The tablets (scored, so they can be halved) on hand are labelled 250 mg per tab. How many tablets are given?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: tab. Write each line with its units.
Practice only, not clinical advice.
An order reads 37.5 mg by mouth. The tablets (scored, so they can be halved) on hand are labelled 25 mg per tab. How many tablets are given?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: tab. Write each line with its units.
Practice only, not clinical advice.
An order reads 200 mg by mouth. The capsules (they cannot be opened or split) on hand are labelled 100 mg per cap. How many capsules are given?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: cap. Write each line with its units.
Practice only, not clinical advice.
An order reads 0.125 mg by mouth. The tablets (scored, so they can be halved) on hand are labelled 62.5 mcg per tab. How many tablets are given?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: tab. Write each line with its units.
Oral liquids
Practice only, not clinical advice.
An order reads 300 mg by mouth. The oral liquid on hand is labelled 100 mg per 5 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
An order reads 125 mg by mouth. The oral liquid on hand is labelled 250 mg per 5 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
An order reads 0.4 g by mouth. The oral liquid on hand is labelled 80 mg per 1 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
An order reads 90 mg by mouth. The oral liquid on hand is labelled 50 mg per 1 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
An order reads 7.5 mg by mouth. The oral liquid on hand is labelled 5 mg per 2 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
An order reads 12 units by subcutaneous injection. The vial on hand is labelled 100 units per 1 mL. How many mL are drawn up?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Weight-based doses
Practice only, not clinical advice.
A dose is ordered at 5 mg per kg. The person weighs 150 lb. How many mg is the dose?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mg. Write each line with its units.
Practice only, not clinical advice.
A dose is ordered at 15 mg per kg. The person weighs 33 lb. How many mg is the dose?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mg. Write each line with its units.
Practice only, not clinical advice.
A dose is ordered at 0.5 mg per kg. The person weighs 70 kg. How many mg is the dose?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mg. Write each line with its units.
Practice only, not clinical advice.
A dose is ordered at 10 mg per kg. The person weighs 44 lb. The liquid on hand is labelled 100 mg per 5 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
A dose is ordered at 3 mg per kg. The person weighs 110 lb. The liquid on hand is labelled 50 mg per 1 mL. How many mL are given?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
IV rate in mL/hr
Practice only, not clinical advice.
An IV bag of 1000 mL is to run over 8 hr on a pump. What rate, in mL per hour, is set?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
Practice only, not clinical advice.
An IV bag of 500 mL is to run over 6 hr on a pump. What rate, in mL per hour, is set?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
Practice only, not clinical advice.
An IV bag of 250 mL is to run over 90 min on a pump. What rate, in mL per hour, is set?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
Practice only, not clinical advice.
An IV bag of 1 L is to run over 12 hr on a pump. What rate, in mL per hour, is set?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
IV drops per minute
Practice only, not clinical advice.
An IV is ordered to run at 125 mL per hour by gravity. The tubing's drop factor is 15 gtt per mL. How many drops per minute?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: gtt/min. Write each line with its units.
Practice only, not clinical advice.
An IV is ordered to run at 125 mL per hour by gravity. The tubing's drop factor is 20 gtt per mL. How many drops per minute?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: gtt/min. Write each line with its units.
Practice only, not clinical advice.
An IV is ordered to run at 200 mL per hour by gravity. The tubing's drop factor is 10 gtt per mL. How many drops per minute?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: gtt/min. Write each line with its units.
Practice only, not clinical advice.
An IV is ordered to run at 50 mL per hour by gravity. The tubing's drop factor is 60 gtt per mL. How many drops per minute?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: gtt/min. Write each line with its units.
Infusion time
Practice only, not clinical advice.
A 500 mL IV bag is running at 125 mL per hour. How many hours until it is empty?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: hr. Write each line with its units.
Practice only, not clinical advice.
A 1000 mL IV bag is running at 80 mL per hour. How many hours until it is empty?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: hr. Write each line with its units.
Practice only, not clinical advice.
A 250 mL IV bag is running at 150 mL per hour. How many hours until it is empty?
- Rounding rule: Round your final answer to the nearest hundredth, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: hr. Write each line with its units.
Titration in mcg/kg/min
Practice only, not clinical advice.
An infusion is ordered at 5 mcg per kg per minute for a person who weighs 70 kg. The bag is labelled 1.6 mg per mL. At what rate, in mL per hour, does the pump run?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then.
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
Practice only, not clinical advice.
An infusion is ordered at 2 mcg per kg per minute for a person who weighs 80 kg. The bag is labelled 0.8 mg per mL. At what rate, in mL per hour, does the pump run?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
Practice only, not clinical advice.
An infusion is ordered at 10 mcg per kg per minute for a person who weighs 60 kg. The bag is labelled 2 mg per mL. At what rate, in mL per hour, does the pump run?
- Rounding rule: Round your final answer to the nearest whole number, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL/hr. Write each line with its units.
Reconstitution
Practice only, not clinical advice.
A powdered medication has been reconstituted, and the label now reads 100 mg per 1 mL. The order is 250 mg. How many mL are drawn up?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
A powdered medication has been reconstituted, and the label now reads 500 mg per 5 mL. The order is 350 mg. How many mL are drawn up?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Practice only, not clinical advice.
A powdered medication has been reconstituted, and the label now reads 250 mg per 5 mL. The order is 400 mg. How many mL are drawn up?
- Rounding rule: Round your final answer to the nearest tenth, and only at the last step; keep full precision until then. (This one comes out even.)
- Conversions: Use 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL, 1 hr = 60 min, 1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL and 1 fl oz = 30 mL.
- Final unit: mL. Write each line with its units.
Questions
What Lemma stores and why: privacy.
Is this clinical advice?
No. Every problem uses made-up numbers for arithmetic practice, and no number on these pages is a recommendation for any real person or medication. Never use this page to work out a real dose; follow your program's rules and your facility's policies.
What does "can't check this line" mean?
The checker has three outcomes: correct, a named error, or can't check. If a line cannot be read (a unit it does not know, a bare number at the end, an unclear fraction), it is never passed. It is returned to you with the reason so you can rewrite it. A line that matches the answer can still be marked partly verified when a number has no unit or the setup uses numbers that don't match the problem's.
Why does each problem state a rounding rule?
Rounding rules differ between programs, so Lemma never assumes one. Each problem tells you how to round and when, and the checker holds you to that rule.
Which kg to lb conversion is used?
These problems use 1 kg = 2.2 lb and say so in the problem. Some programs use a different value; if yours does, use your program's value in your own work.
Do I need an account? What is sent about my work?
No account. The checker runs in your browser, and nothing you type is stored or sent: not your lines, not the problem's numbers. Lemma does send a few Google Analytics events from this site, and Google Analytics sets its own cookie, so they are counts, not a promise of anonymity. They are: dosage_problem_started (the problem type, such as oral or IV); dosage_check_used (the problem type, whether it was a final answer, the outcome: correct, partly verified, error or can't check, and for an error its name, such as inverted-ratio); dosage_problem_finished (the problem type, whether the work was fully or partly verified, whether you used a hint, the number of wrong lines and of checks); and dosage_set_finished (which set you finished, with counts of problems solved clean, with help and partly verified). Which problems you solved is kept in this browser only.