Seconds Converter
Unit ConversionConvert seconds to milliseconds, microseconds, nanoseconds, picoseconds, minutes, hours, days, weeks, months and years at once, and back.
Seconds
Shorter Units
Longer Units
1 Second = 1,000 Milliseconds ⟷ 1 Millisecond = 0.001 Seconds
1 Second = 1,000,000 Microseconds ⟷ 1 Microsecond = 0.000001 Seconds
1 Second = 1,000,000,000 Nanoseconds ⟷ 1 Nanosecond = 0.000000001 Seconds
1 Second = 1,000,000,000,000 Picoseconds ⟷ 1 Picosecond = 0.000000000001 Seconds
1 Second = 0.0166667 Minutes ⟷ 1 Minute = 60 Seconds
1 Second = 0.000277778 Hours ⟷ 1 Hour = 3,600 Seconds
1 Second = 0.0000115741 Days ⟷ 1 Day = 86,400 Seconds
1 Second = 0.00000165344 Weeks ⟷ 1 Week = 604,800 Seconds
1 Second = 0.000000380257 Months (average) ⟷ 1 Month (average) = 2,629,800 Seconds
1 Second = 0.0000000316881 Years (average) ⟷ 1 Year (average) = 31,557,600 Seconds
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Unit Conversion calculators
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Odeh Ahwal0people find this calculator helpful
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Unit Conversion calculators
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SponsoredThis seconds converter shows an amount of time in seconds next to milliseconds, microseconds, nanoseconds, picoseconds, minutes, hours, days, weeks, months and years. Type into any box and the others update as you type, so it converts sec to ms, seconds to minutes and back.
The second is the SI unit of time, and every smaller unit is a power of ten below it, so those conversions never round. Minutes, hours, days and weeks are fixed multiples of the second too. Months and years use the 365.25 day average year.
Results show up to six decimal places, so a few nanoseconds in years can round to 0. To convert a time written as hours, minutes and seconds into seconds, see the method below.
What Is a Second
The second, symbol s, is the SI base unit of time. It is defined by the frequency of the caesium 133 atom: one second is 9,192,631,770 cycles of the radiation from a particular transition of that atom (BIPM). The atomic definition was adopted in 1967, replacing a second defined by the Earth's motions (NIST).
Larger SI multiples exist but are rarely used: a kilosecond is 1,000 seconds, about 16.7 minutes, and a megasecond is 1,000,000 seconds, about 11.6 days.
How to Convert Time to Seconds
- Multiply the hours by 3,600.
- Multiply the minutes by 60.
- Add both to the seconds. For 2:15:30, that is 7,200 + 900 + 30 = 8,130 seconds.
Going the other way, divide by 3,600 for whole hours and take the remainder: 100,000 seconds is 1 day, 3 hours, 46 minutes and 40 seconds, or 27.7778 hours in decimal form. The Time Calculator adds and subtracts times written this way.
How Many Seconds in a Week
A week has 604,800 seconds: 7 days of 86,400 seconds each. Timestamps in software count seconds this way, and the Unix Timestamp Converter turns a count of seconds since 1970 into a date.
| Unit | Seconds | Value Status |
|---|---|---|
| 1 minute | 60 seconds | Exact |
| 1 hour | 3,600 seconds | Exact |
| 1 day | 86,400 seconds | Exact |
| 1 week | 604,800 seconds | Exact |
| 1 month | 2,629,800 seconds | Average |
| 1 year | 31,557,600 seconds | Average |
How Many Seconds in a Month
A 30 day month has 2,592,000 seconds and a 31 day month has 2,678,400. The average month in this converter has 2,629,800 seconds.
Seconds in Smaller Units
Each smaller unit is a thousand times shorter than the one before it, so a second is 1,000 milliseconds.
How Many Microseconds in a Second
A second has 1,000,000 microseconds, written µs. A microsecond is a millionth of a second.
How Many Nanoseconds in a Second
A second has 1,000,000,000 nanoseconds, a billion, and 1,000,000,000,000 picoseconds, a trillion. A nanosecond is a billionth of a second.
Single Time Conversions
Single conversions that start from or end in seconds, one page per pair of units.
- Seconds to Hours Converter: 1 hour = 3,600 seconds
- Minutes to Seconds Converter: 1 minute = 60 seconds
- Seconds to Days Converter: 1 day = 86,400 seconds
- Seconds to Years Converter: 1 year is 31,557,600 seconds on average
- Milliseconds to Seconds Converter: 1 second = 1,000 milliseconds
Other Time Converters
Each converter below shows one amount of time in many units at once, starting from a different unit.
- Day Converter: days to hours, minutes, weeks, fortnights, months and years at once
- Hour Converter: hours to minutes, seconds, days, weeks, months and years at once
- Minute Converter: minutes to hours, seconds, days, weeks and more at once
- Milliseconds Converter: milliseconds to seconds, minutes, microseconds and more at once
- Time Unit Converter: any amount of time in 13 units, from picoseconds to decades
Frequently Asked Questions
How long is a million seconds?
About 11.5741 days, which is 11 days, 13 hours, 46 minutes and 40 seconds.
How many minutes is 1,000 seconds?
About 16.6667 minutes, which is 16 minutes and 40 seconds.
How many seconds are in a year?
31,557,600 seconds in an average year of 365.25 days, or 31,536,000 in a 365 day year.
What is a leap second?
A second added to official clock time (UTC) now and then, so that clocks stay close to the Earth's rotation, which is slightly irregular. The day it is added has 86,401 seconds instead of 86,400.
What is the symbol for seconds?
The SI symbol is s, with no period and no plural form, as in 45 s. Sec is a common informal short form.
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