Time converter
Convert time units from milliseconds to years, read the duration in plain English, and see how many days, hours, heartbeats and breaths you have lived.
Converted duration
In plain English
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- Milliseconds
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- Seconds
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- Minutes
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- Hours
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- Days
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- Weeks
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- Months
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- Years
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Life calculator
See how many days and hours you have lived, and a rough estimate of your heartbeats and breaths.
- Days lived
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- Hours lived
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- Heartbeats
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- Breaths taken
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Common durations for comparison
| Event | Typical duration |
|---|---|
| Average pop song | 3 minutes |
| TV episode | 22 minutes |
| Feature film | 90 minutes, 1 hr 30 min |
| Full workday | 8 hours |
| Recommended nightly sleep | 8 hours |
| Human pregnancy | 9 months, about 40 weeks |
| US life expectancy at birth | about 79 years |
| Age of the universe | about 13.8 billion years |
How it works
Time conversion expresses duration across units from milliseconds to years, with the base relationships being 60 seconds per minute, 60 minutes per hour, 24 hours per day, and 365.25 days per year on average, which accounts for leap years.
- Enter a duration and unit
Or pick a quick duration such as a movie or a workday.
- Read it in plain English
Every other unit updates at the same time.
- Try the life calculator
Enter your age to see days, hours, heartbeats and breaths.
Time unit reference
Every unit here converts through seconds, using average lengths for the calendar units so the tool works the same regardless of which month or year you mean.
1 minute = 60 s, 1 hour = 3,600 s, 1 day = 86,400 s, 1 week = 604,800 s
A month averages 2,629,746 seconds (30.44 days), the mean length of a calendar month over a 400-year Gregorian cycle. A year averages 31,556,952 seconds (365.2425 days), which is the mean Gregorian calendar year and already accounts for leap years. Because these are averages, converting a specific calendar month or year, for example February in a leap year, can differ slightly from the figure shown here.
How the life calculator works
Days and hours lived come directly from your age times 365.25 days a year. Heartbeats assume a resting heart rate of 70 beats a minute, a commonly cited average for adults, and breaths assume 15 breaths a minute, a typical resting respiratory rate. Both vary by person, fitness and activity level, so treat the totals as an order-of-magnitude estimate rather than a precise count.
Months and years are not fixed lengths
A calendar month can be 28 to 31 days and a calendar year is 365 or 366 days, so any single-number conversion for these two units is necessarily an average. For an exact count between two specific calendar dates, use a date-difference calculator instead of a duration converter like this one.
Frequently asked questions
How many seconds are in a day?
There are 86,400 seconds in a day: 60 seconds x 60 minutes x 24 hours = 86,400. A week has 604,800 seconds, and a non-leap year has 31,536,000 seconds (365 x 86,400). This figure matters in computing, since Unix timestamps count seconds since January 1, 1970, and in setting day and night cycle lengths.
How many hours is 1 year?
A common, non-leap year has 365 x 24 = 8,760 hours. A leap year has 8,784 hours. The average Gregorian year, which accounts for leap years every 4 years with exceptions at century marks, is 365.2425 days, or 8,765.82 hours. This figure is useful for electricity cost calculations, where an appliance rated in kW times 8,760 hours gives annual kWh, and for expressing long durations.
How do you convert minutes to hours and minutes?
Divide the total minutes by 60. The whole-number quotient is the hours, and the remainder is the remaining minutes. Example: 145 minutes divided by 60 is 2 remainder 25, so 145 minutes equals 2 hours 25 minutes. In decimal, 145 divided by 60 is 2.4167 hours, and multiplying the decimal part, 0.4167, by 60 gives back 25 minutes.
How many weeks are in a year?
A year has approximately 52.18 weeks, 365.25 divided by 7. In practice a regular year has exactly 52 weeks and 1 day, and a leap year has 52 weeks and 2 days. This is why a date that falls on a Monday this year falls on a Tuesday next year, or a Wednesday after a leap year. Payroll systems typically count 52 weekly pay periods.
What is the difference between a millisecond, a microsecond and a nanosecond?
1 millisecond (ms) is 0.001 seconds, one thousandth. 1 microsecond is 0.000001 seconds, one millionth. 1 nanosecond is 0.000000001 seconds, one billionth. Computer processors operate at nanosecond speeds; a 3.5 GHz CPU executes a clock cycle roughly every 0.286 ns. Internet latency is usually measured in milliseconds, while GPS signal timing requires nanosecond precision.