⏱️ Time Converter
Free online time converter. Convert between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months and years.
Conversion Reference Table
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Time Conversion Guide
Time conversions are needed in many everyday situations — calculating how many minutes are in a day, converting hours to seconds for a physics problem, or figuring out how many weeks are in a year. Our time converter handles everything from nanoseconds to centuries.
Key time conversion facts: 1 minute = 60 seconds. 1 hour = 3,600 seconds or 60 minutes. 1 day = 86,400 seconds or 24 hours. 1 week = 604,800 seconds or 7 days. 1 year (Julian) = 365.25 days = 8,766 hours = 525,960 minutes = 31,557,600 seconds.
Months and Years
Months are tricky because they vary in length (28–31 days). Our converter uses the average month length of 30.4375 days (365.25 ÷ 12) for month conversions. For precise date calculations, use our Date Calculator instead, which accounts for the actual calendar. A decade is 10 years, a century is 100 years, and a millennium is 1,000 years.