CALCULATIONS RELATED TO TIME
This unit covers how to calculate for hours and minutes using Dimensional Analysis. This unit will also cover
how to calculate for total medication administered in a determined timeframe using Dimensional Analysis.
Time Conversions
MEMORIZE THIS
1 hour = 60 minutes
Daily = 24 hours
BID = Q12H
TID = Q8H
QID = Q6
Total Medication Received Over Time
Example Problem:
A physician orders Dilantin 300 mg BID. How many total mg(s) will the client receive in a 24-hour
period? Round to the tenth.
Step 1:
Write the unit of measure being calculated.
mg =
Step 2:
The denominator is how often the medication is administered. BID means every 12 hours. 300mg and 12 hours
are the “sisters” in this problem.
mg = 300mg
12hr
Step 3:
Follow the leader.
mg = 300mg x 24hr =
12hr
Step 4:
Cross out matching units and calculate.
mg = 300mg x 24 hr = 300x24 = 7200 = 600mg
12hr 12 12
11/28/2023DS,2/1/24CP,6/29/24DS
This unit covers how to calculate for hours and minutes using Dimensional Analysis. This unit will also cover
how to calculate for total medication administered in a determined timeframe using Dimensional Analysis.
Time Conversions
MEMORIZE THIS
1 hour = 60 minutes
Daily = 24 hours
BID = Q12H
TID = Q8H
QID = Q6
Total Medication Received Over Time
Example Problem:
A physician orders Dilantin 300 mg BID. How many total mg(s) will the client receive in a 24-hour
period? Round to the tenth.
Step 1:
Write the unit of measure being calculated.
mg =
Step 2:
The denominator is how often the medication is administered. BID means every 12 hours. 300mg and 12 hours
are the “sisters” in this problem.
mg = 300mg
12hr
Step 3:
Follow the leader.
mg = 300mg x 24hr =
12hr
Step 4:
Cross out matching units and calculate.
mg = 300mg x 24 hr = 300x24 = 7200 = 600mg
12hr 12 12
11/28/2023DS,2/1/24CP,6/29/24DS
