Military Time Converter

How to use this military time calculator

What this calculator does

This converter expresses one clock time in three equivalent formats: four-digit military time, conventional 24-hour clock notation, and standard 12-hour time with AM or PM. It also provides a plain-language reading, decimal hours, and a nearby-times table. The conversion is an exact identity for the entered hour and minute; it does not determine a time zone, date, daylight-saving rule, or elapsed duration.

When to use it

Use it when reading schedules, travel notices, shift rosters, emergency-service logs, technical records, or any document that avoids AM/PM ambiguity. It is also useful for checking whether a time such as 1635 means 4:35 PM, preparing a four-digit time for a form, or teaching the relationship between the 12-hour and 24-hour systems. The U.S. Navy describes military time as four digits based on the 24-hour clock, with a normal range from 0000 to 2359.

How to calculate

1. The calculator opens with the demonstration time 4:35 PM, so the results and Excel workbook are ready immediately.
2. Choose Convert from. For standard time, enter Hour, Minutes, and AM or PM. For military or 24-hour input, enter the hour and minute in the fields shown.
3. Read Military time as the primary result. The same instant appears as 24-hour clock, Standard time, Read aloud, and Decimal hours.
4. Review the Nearby times table to see the same conversion 30 and 60 minutes before and after the entered time.
5. Select Download Excel to export the current validated inputs and results. Reset clears the demonstration values and disables export until a complete valid time is entered again.

Input guide

Convert from is required and selects the input notation. Hour is a whole number: 1-12 in standard mode and 0-23 in 24-hour mode. Minutes is required and accepts 0-59; use 5, not 0.05, for five minutes. AM or PM is required only in standard mode. Military time accepts exactly four digits, including leading zeros, such as 0715. Do not enter a colon in military mode, and do not use 2400 here; this tool follows the unambiguous 0000-2359 range.

Output guide and worked example

Military time is the zero-padded four-digit identity. 24-hour clock inserts a colon. Standard time uses 1-12 plus AM or PM. Read aloud gives a practical spoken rendering. Decimal hours equals hour plus minutes divided by 60 and is mainly useful for time-of-day comparisons, not payroll duration calculations. With the startup example, 4:35 PM is in the afternoon, so 12 is added to the hour: 4 + 12 = 16. The minutes stay 35, producing 1635, 16:35, and 4:35 PM. Decimal time is 16 + 35/60 = 16.5833..., displayed as 16.58 h.

Learn more

For an official example of the 24-hour range and four-digit notation, consult the U.S. Navy memorandum-format instructions. The Library of Congress MARC time specification likewise uses a 24-hour clock with hours 00-23, while the U.S. Naval Observatory time tables show how four-digit 24-hour times such as 1836 correspond to 6:36 PM.