The Military Time Converter changes a regular 12-hour clock time into its four-digit 24-hour equivalent, and reverses the conversion just as directly. Enter a time with AM or PM and the calculator strips the colon, adds 12 to any PM hour after noon, and returns a four-digit result such as 1445. Entering a military time in the other direction returns the 12-hour equivalent along with AM or PM and the way the time is normally spoken aloud.
People also search for this tool as a military clock converter or a military time calculator. The steps are the same either way: 12-hour to four-digit military time, or military time to regular time.
Convert regular time to military time
Converting from 12-hour to military time depends on which half of the day the hour falls in. Midnight, 12:00 AM, becomes 0000. Hours from 1 AM through 11 AM keep their number and gain a leading zero where needed, becoming 0100 through 1100.
Noon, 12:00 PM, becomes 1200. Hours from 1 PM through 11 PM add 12 to the hour number, becoming 1300 through 2300.
The Military Time Converter removes the colon and pads the result to four digits, so 9:05 AM becomes 0905, not 905. The minutes portion never changes during the conversion; only the hour is adjusted, and only for times after noon.
4 pm military time and 2pm in military time
4 pm military time is 1600: add 12 to 4, then drop the colon. 2pm in military time is 1400: add 12 to 2. The same rule covers any other PM hour after noon.
12 pm military time
12 pm military time is 1200. Noon keeps the number 12 rather than adding another 12. That makes 12:00 PM one of the two exceptions worth memorizing with midnight.
Convert military time to regular time
Converting from military time back to 12-hour format reverses the same logic. A military time from 0000 through 1159 is read as-is in the AM, with 0000 specifically representing 12:00 AM rather than 0 o'clock, since a 12-hour clock has no zero hour. 1200 becomes 12:00 PM.
Any value from 1300 through 2359 has 12 subtracted from the hour and is read as PM.
The Military Time Converter inserts the colon back between the hour and minute digits and assigns AM or PM based on which of these three ranges the input falls into. 1445 becomes 2:45 PM: 14 minus 12 is 2, and any hour of 13 or above is always PM.
1500 military time and 2100 military time
1500 military time is 3:00 PM: subtract 12 from 15. 2100 military time is 9:00 PM: subtract 12 from 21. Both follow the standard military time to regular time rule for hours of 13 or above.
Army time to EST
"Army time" is another common name for military 24-hour notation. When people ask for army time to EST, they usually want that four-digit clock read as regular 12-hour time first (for example, 1500 as 3:00 PM). This military time calculator does that conversion. Shifting a clock time into the Eastern time zone itself is a separate timezone step; use a timezone tool when the question is about Eastern Standard Time as a region, not about the 12-hour or 24-hour format.
Read the full military time chart
A full chart lists every hour of the day in both formats side by side, from 0000 at midnight through 2359 one minute before the following midnight.
Selected reference points: 12:00 AM is 0000, 1:00 AM is 0100, 6:00 AM is 0600, 9:00 AM is 0900, 12:00 PM is 1200, 1:00 PM is 1300, 2:00 PM is 1400, 3:00 PM is 1500, 4:00 PM is 1600, 6:00 PM is 1800, 9:00 PM is 2100, and 11:59 PM is 2359.
The pattern to remember is that every AM hour before noon matches its military equivalent exactly, only with a leading zero and no colon, while every PM hour after noon adds 12. Noon and midnight are the two exceptions worth memorizing directly, since neither follows the general add-or-keep pattern in an obvious way.
Convert 2:45 PM to military time
Converting 2:45 PM to military time returns 1445. 1. Confirm the time is in the PM range after noon. 2:45 PM falls between 1 PM and 11 PM, so 12 is added to the hour. 2. Add 12 to the hour. 2 plus 12 is 14.
3. Remove the colon and combine the digits. The hour 14 and the minutes 45 combine into the four-digit result 1445, with no colon and no AM or PM marker needed.
Reversing the conversion confirms it: 1445 has an hour value of 14, which is 13 or above, so 12 is subtracted to get 2, and the result is read as 2:45 PM.
Say military time aloud
Military time is spoken differently from how it is written. 1445 is spoken as "fourteen forty-five," reading the hour and minute digits as two separate two-digit numbers. Times on the hour are often spoken with "hundred," so 0600 is "zero six hundred hours" and 1800 is "eighteen hundred hours."
The word "hundred" marks the number as a time rather than a plain count, which is why it appears even though there is no literal hundred involved. This convention is standard in military, aviation, and emergency services radio communication, where clarity under noise or stress matters more than brevity.
Understand midnight: 0000 and 2400
Midnight creates the one genuine ambiguity in 24-hour time, because the same instant can be written two different ways depending on which day it is meant to close or open. 0000 represents the very start of a day, used when midnight begins a new period. 2400 represents the very end of a day, used when midnight closes out the period just finished, and both refer to the identical moment in time.
Most schedules avoid 2400 specifically because of this ambiguity, using 2359 to mark the last minute of a day instead and reserving 0000 for the day's opening moment. A rail or flight timetable that needs to state a service running through midnight will typically write the departure as 0000 on the new day rather than 2400 on the old one, precisely to avoid the reader momentarily wondering which day is meant.
Use military time in practice
Military time removes the AM and PM ambiguity that causes real scheduling errors, which is why it is standard in aviation, medical charting, logistics, and emergency services.
A flight schedule, a hospital medication chart, or a shipping manifest that ran on 12-hour time would need an AM or PM marker on every single entry, and a single missing or misread marker could put an event twelve hours off from its intended time.
Shift schedules in industries that run around the clock, such as manufacturing plants and hospitals, commonly post shift start and end times in 24-hour format for the same reason: a shift listed as 0700 to 1500 cannot be misread as evening, while "7:00 to 3:00" without a marker genuinely could be.
Frequently asked questions
How do I convert regular time to military time?
For any time from 1 AM to 11 AM, keep the hour and add a leading zero if needed. For 12 AM, use 0000. For 12 PM, use 1200. For any time from 1 PM to 11 PM, add 12 to the hour. Remove the colon in every case to get the four-digit result.
How do I convert military time to regular time?
Any value from 0000 through 1159 is AM, with 0000 read as 12:00 AM. 1200 is 12:00 PM. Any value from 1300 through 2359 has 12 subtracted from the hour and is read as PM. That is the military time to regular time direction of this military clock converter.
What is 1500 military time?
1500 military time is 3:00 PM. Subtract 12 from the hour 15.
What is 2100 military time?
2100 military time is 9:00 PM. Subtract 12 from the hour 21.
What is 2pm in military time?
2pm in military time is 1400. Add 12 to 2, then drop the colon.
What is 4 pm military time?
4 pm military time is 1600. Add 12 to 4, then drop the colon.
What is 12 pm military time?
12 pm military time is 1200. Noon keeps 12 rather than adding another 12.
What is 2:45 PM in military time?
2:45 PM is 1445 in military time. Add 12 to the hour, 2 plus 12 is 14, then remove the colon to get the four-digit result.
What is the difference between 0000 and 2400?
Both refer to the exact same instant, midnight, but 0000 marks the start of a day and 2400 marks the end of one. Most schedules avoid 2400 and use 2359 for the last minute of a day instead, to prevent confusion about which day midnight belongs to.
How is military time spoken aloud?
Digits are read as two separate two-digit numbers, so 1445 is spoken as "fourteen forty-five." Times exactly on the hour are often spoken with "hundred," such as "zero six hundred hours" for 0600.
Why do hospitals and airlines use military time?
24-hour time removes the AM and PM ambiguity that a 12-hour clock carries on every entry. A single missing AM or PM marker in a hospital chart or flight schedule can put an event twelve hours off from what was intended, which 24-hour time makes structurally impossible.
Is military time the same as the 24-hour clock?
Yes. Military time is the common name in the United States for the 24-hour clock format used internationally for timetables, schedules, and most digital clocks outside the US. Army time means the same four-digit format.
What does 1200 mean in military time?
1200 is noon, 12:00 PM. It is one of the two exceptions to the general pattern, since it keeps the number 12 rather than following the add-12 rule that applies to every other PM hour.
Summary
The Military Time Converter changes a 12-hour time with AM or PM into its four-digit 24-hour equivalent by adding 12 to any PM hour after noon and removing the colon, and reverses the process by subtracting 12 from any value of 1300 or above. As a military time calculator or military clock converter, it covers military time to regular time in that reverse direction.
Useful checks from the same rules: 2pm in military time is 1400, 4 pm military time is 1600, 12 pm military time is 1200, 1500 military time is 3:00 PM, and 2100 military time is 9:00 PM.
Midnight is the one point requiring care, written as 0000 to open a day and 2400 to close one, with 2359 used in practice to avoid the ambiguity. The format is standard across aviation, medical charting, logistics, and emergency services precisely because it removes the AM and PM error a 12-hour clock allows.