Time Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years instantly with this free online time unit converter. Simple bidirectional time conversion for planning and scheduling.
About This Calculator
The Time Unit Converter is a comprehensive time conversion tool that instantly converts any value between eight different time units: milliseconds, seconds, minutes, hours, days, weeks, months, and years. Whether you are calculating project timelines in hours and minutes, converting work shifts from hours to seconds, planning multi-week vacations in days, or computing scientific durations across months and years, this calculator provides all equivalent values simultaneously in one view.
The converter uses the internationally accepted SI time standards: 1 second = 1,000 milliseconds, 1 minute = 60 seconds, 1 hour = 60 minutes, 1 day = 24 hours, 1 week = 7 days, 1 month = 30.4375 days (average Gregorian calendar month), and 1 year = 365.25 days (Julian year accounting for leap years). All results are displayed with up to six decimal places for maximum precision in professional, scientific, and engineering applications.
This bidirectional time unit converter is essential for project managers converting task estimates between hours and days, software developers working with millisecond and second precision in performance metrics, students solving physics problems involving time conversions, travelers planning itineraries across days and weeks, fitness enthusiasts tracking workout durations across different units, and anyone who needs to quickly convert between any time measurement units without manual calculation.
Frequently Asked Questions
How many milliseconds are in a second?
There are 1,000 milliseconds in one second. Millisecond is the SI unit for one-thousandth of a second and is commonly used in computing, science, and precision timing applications.
How many minutes are in an hour?
There are exactly 60 minutes in one hour. This standard has been used since ancient Babylonian times and is now the internationally accepted base unit of time measurement.
How many hours are in a day?
There are exactly 24 hours in one day, based on the Earth's rotation period relative to the Sun. A day is further divided into 1,440 minutes or 86,400 seconds.
How do you convert hours to minutes?
To convert hours to minutes, multiply the number of hours by 60. For example, 2 hours × 60 = 120 minutes, and 24 hours × 60 = 1,440 minutes.
How do you convert minutes to hours?
To convert minutes to hours, divide the number of minutes by 60. For example, 120 minutes ÷ 60 = 2 hours, and 90 minutes ÷ 60 = 1.5 hours.
How many seconds are in an hour?
There are 3,600 seconds in one hour (60 minutes × 60 seconds). Over a full day, this equals 86,400 seconds, and over a standard week it amounts to 604,800 seconds.
How do you convert between different time units?
To convert between time units, multiply by the conversion factor when going from a larger unit to a smaller unit (e.g., hours to minutes × 60), or divide when going from a smaller unit to a larger unit (e.g., minutes to hours ÷ 60). This free time unit converter handles all conversions automatically in both directions.
Is this time unit converter free to use?
Yes, this time unit converter is completely free to use with no registration or download required. You can convert between all common time units instantly from any device with an internet connection.