Answer first
What this calculator tells you
Convert a time between 12-hour AM and PM and 24-hour military time. Read a schedule, a log or a timetable that uses the 24-hour clock. Formula: 24-hour time = the 12-hour time with 12 hours added to any PM hour; 12 AM is 00 and 12 PM is 12. At the worked-example inputs, the 24-hour (military) time is 17:45. Holding every other input steady, moving time from 4:45 PM to 6:45 PM moves the result from 16:45 to 18:45.
Transparent method
The formula
Read a schedule, a log or a timetable that uses the 24-hour clock.
Worked example
Example inputs
How to interpret the result
Military time counts the hours from 00 to 23 and drops AM and PM. Midnight is 00:00, noon is 12:00, and every hour after noon adds twelve, so 5:45 PM becomes 17:45. The two ambiguous points are midnight and noon: 12 AM is 00, and 12 PM is 12. Getting those two backward is the most common mistake in a shift schedule or a flight log.
Times are worked out from the clock readings you enter, to the minute. Daylight saving, leap seconds and a workplace's own rounding or break rules apply only where a field asks for them, so confirm any pay, travel or scheduling decision against the official clock and your own policy.
Before you rely on it
What to check
Look at the 12 o'clock cases twice. A 12:30 AM appointment is 00:30, not 12:30, and the day it belongs to is the one that just started.
The common error
Where people go wrong with military time converter calculator
Adding 12 to every hour. Morning hours stay as they are, and 12 PM stays 12, so only 1 PM to 11 PM gain twelve.
Sensitivity evidence
How time changes the 24-hour (military) time
Holding every other input at the worked-example value, moving time from 4:45 PM to 6:45 PM moves the 24-hour (military) time from 16:45 to 18:45: a spread of 120 minutes.
| Time | 24-hour (military) time | 12-hour time |
|---|---|---|
| 4:45 PM | 16:45 | 4:45 PM |
| 5:15 PM | 17:15 | 5:15 PM |
| 5:45 PMworked example | 17:45 | 5:45 PM |
| 6:15 PM | 18:15 | 6:15 PM |
| 6:45 PM | 18:45 | 6:45 PM |
Step by step
The worked example, input by input
| Input | Value used | What it means |
|---|---|---|
| Time | 5:45 PM | Enter the time used in this calculation. |
| 24-hour (military) time | 17:45 | |
| 12-hour time | 5:45 PM | |
Inputs, definitions and assumptions
Time
Enter the time used in this calculation. The prefilled worked-example value is 5:45 PM.
How to use this calculator
- 1Verify the inputs. Gather time from your own documents; the prefilled values are examples.
- 2Save a baseline. The worked example puts the 24-hour (military) time at 17:45. Store your own version of it as Scenario A.
- 3Test one change. Change one assumption at a time so the driver stays visible.
- 4Check the boundary. Read the interpretation boundary above before acting on the result.
People also ask
Frequently asked questions
How do you calculate military time converter?
24-hour time = the 12-hour time with 12 hours added to any PM hour; 12 AM is 00 and 12 PM is 12. At the worked-example inputs the 24-hour (military) time is 17:45.
What does the military time converter result mean?
Read a schedule, a log or a timetable that uses the 24-hour clock.
How much does time change the 24-hour (military) time?
Holding every other input at the worked-example value, moving time from 4:45 PM to 6:45 PM moves the 24-hour (military) time from 16:45 to 18:45, a spread of 120 minutes.
What are the limits of this military time converter calculator?
Times are worked out from the clock readings you enter, to the minute. Daylight saving, leap seconds and a workplace's own rounding or break rules apply only where a field asks for them, so confirm any pay, travel or scheduling decision against the official clock and your own policy. The tables on this page test time only from 4:45 PM to 6:45 PM; a value outside that range is not tabulated here.
Is 12 AM midnight or noon?
Midnight. 12 AM is the start of the day, 00:00 on the 24-hour clock, and 12 PM is noon, 12:00. Writing 12:00 midnight or 12:00 noon avoids doubt in a schedule.
How is a day counted when the result passes midnight?
The clock reading wraps back to the start of the day, and a separate count says how many days later it falls. A time of 2:45 AM with one day later is the next morning.
Are these tools accurate to the minute?
Yes. They work in whole minutes, so a result never carries rounding beyond the minute. Seconds are not part of the inputs.
Can I rely on a sleep calculator for how much sleep I need?
It shows bedtimes that fit whole cycles, not how much sleep you need. Needs vary between adults, and how rested you feel after several days matters more than any single figure.
How do I handle unpaid breaks on a time card?
Subtract the break from the total span, as the time card calculator does. Some workplaces treat short rest breaks as paid, so check your policy before you deduct one.
Sources and evidence
Free Calculators Online is independent and is not affiliated with or endorsed by the source organizations. Educational estimates only.