Years to Seconds Converter
Unit ConversionConvert years to seconds (1 year = about 31,557,600 seconds). Free converter with the formula, a conversion chart, and worked examples.
Seconds
Equivalent duration in seconds
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SponsoredTo convert years to seconds, multiply the number of years by 31,557,600. This calculator does it instantly: enter any year value above and the seconds equivalent updates as you type. For example, 10 years is 315,576,000 seconds.
The number of seconds in a year depends on which year length you use: 31,536,000 seconds for a 365 day common year, 31,622,400 for a 366 day leap year, and 31,557,600 for the 365.25 day average this calculator uses. The average is the right choice for ages and multi year spans, where leap years are mixed in.
Quick answer: 1 year ≈ 31.56 million seconds, 10 years ≈ 315.6 million seconds, and about 2.37 billion seconds pass in 75 years.
This page covers years to seconds only. The related converters further down the page handle the reverse direction and the rest of the time unit family.
How to Convert Years to Seconds
The formula is: seconds = years × 31,557,600 (365.25 days × 24 hours × 60 minutes × 60 seconds).
Worked example: 10 years is 315,576,000 seconds.
To go the other way, use the Seconds to Years Converter, which divides by 31,557,600 instead of multiplying.
How Many Seconds Are in a Year?
It depends on the year length. Each day adds 86,400 seconds, so the totals are:
| Year Length | Days | Seconds |
|---|---|---|
| Common year | 365 | 31,536,000 |
| Leap year | 366 | 31,622,400 |
| Julian average (this calculator) | 365.25 | 31,557,600 |
| Gregorian average | 365.2425 | 31,556,952 |
Some sources quote 31,556,952 seconds, which uses the Gregorian calendar average of 365.2425 days. The difference from this calculator is only 648 seconds (about 11 minutes) per year.
Years to Seconds Conversion Table
Common values in years and their equivalents in seconds:
| Years | Seconds |
|---|---|
| 0.5 years | 15,778,800 seconds |
| 1 year | 31,557,600 seconds |
| 2 years | 63,115,200 seconds |
| 5 years | 157,788,000 seconds |
| 10 years | 315,576,000 seconds |
| 18 years | 568,036,800 seconds |
| 25 years | 788,940,000 seconds |
| 30 years | 946,728,000 seconds |
| 50 years | 1,577,880,000 seconds |
| 75 years | 2,366,820,000 seconds |
| 100 years | 3,155,760,000 seconds |
Where Years to Seconds Conversion Is Used
Astronomy and physics problems often need years in seconds, since SI units are built on the second. It is also a popular way to put a lifetime in perspective: a 30 year old has lived roughly 947 million seconds. For an exact figure from a real birth date, the Age Calculator counts the actual days.
To measure the real time between two dates in years, months and days, use the Time Between Dates Calculator. To check whether a year has a leap day, use the Leap Year Calculator.
Frequently Asked Questions
How many seconds is 3 years?
About 94,672,800 seconds on average.
How many seconds is 20 years?
About 631,152,000 seconds on average.
How many years is a billion seconds?
1,000,000,000 seconds is about 31.7 years (1,000,000,000 divided by 31,557,600). A million seconds is only about 11.6 days, and a trillion seconds is roughly 31,700 years.
Can a years to seconds result be negative?
No. A duration cannot be negative, so a value below zero shows a dash instead of a result.
How old am I in seconds?
Multiply your age in years by 31,557,600 for an estimate. A 25 year old is about 789 million seconds old. For an exact figure, count the days since your birth date and multiply by 86,400.
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