Years to Seconds Converter
Quick answer: To convert years to seconds, multiply by 31,557,600. For example, 10 yr is 315,576,000 s. One year equals 31,557,600 s.
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Use the Years to Seconds Converter
Years to Seconds formula and what each symbol means
s = yr × 31,557,600
| Symbol | Meaning |
|---|---|
| yr | Year |
| s | Second |
Years to Seconds examples
1 yr
1 yr × 31,557,600 = 31,557,600 s.
10 yr
10 yr × 31,557,600 = 315,576,000 s.
100 yr
100 yr × 31,557,600 = 3,155,760,000 s.
Years compared with Seconds
One yr is 31,560,000 times as large as one s, so your number gets bigger when you convert years to seconds and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About years and seconds
Year (yr): Here, the Julian year of 365.25 days. Second (s): The SI base unit of time, defined from the caesium-133 transition frequency.
Where years to seconds conversions are used
Project plans, shift schedules and timers keep switching between seconds, minutes, hours and days. Billing, SLAs and subscriptions are quoted in months, weeks or years.
How to calculate Years to Seconds step by step
- Enter the value in yr (the starting unit).
- Multiply by 31,557,600, because 1 yr = 31,557,600 s.
- The product is the value in s. To go back, divide by 31,557,600 or multiply by 3.168809×10⁻⁸.
Popular time conversions
How to read your Years to Seconds result
Quick estimate: multiply by about 32,000,000 to get seconds from years; this is within 1.5% of the exact factor. Months and years vary in length, so this tool uses averages: a year is 365.25 days (the Julian year) and a month is one twelfth of that, 30.4375 days.
| YEARS | SECONDS |
|---|---|
| 1 | 31,557,600 |
| 2 | 63,115,200 |
| 5 | 157,788,000 |
| 10 | 315,576,000 |
| 20 | 631,152,000 |
| 50 | 1,577,880,000 |
| 100 | 3,155,760,000 |
| 1,000 | 31,557,600,000 |
Seconds to Years: quick table
| SECONDS | YEARS |
|---|---|
| 1 | 3.168809×10⁻⁸ |
| 5 | 1.584404×10⁻⁷ |
| 10 | 3.168809×10⁻⁷ |
| 25 | 7.922022×10⁻⁷ |
| 50 | 0.000001584404 |
| 100 | 0.000003168809 |
| 250 | 0.000007922022 |
| 500 | 0.00001584404 |
Common mistakes when calculating Years to Seconds
- Assuming every month has 30 days or every year has 365 days.
- Dividing when you should multiply: from yr to s multiply by 31,557,600; from s to yr divide by 31,557,600.
Years to Seconds FAQ
How many s are in 1 yr?
1 yr equals 31,557,600 s.
How many yr are in 1 s?
1 s equals 3.168809×10⁻⁸ yr.
Is 1 yr = 31,557,600 s an exact conversion?
Yes. The year and the second are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 31,557,600 is just that ratio shown to 7 significant figures.
What is a second (s)?
The SI base unit of time, defined from the caesium-133 transition frequency.
How can I estimate years to seconds in my head?
Quick estimate: multiply by about 32,000,000 to get seconds from years; this is within 1.5% of the exact factor.
What is 3 yr in seconds?
3 yr = 94,672,800 s (since 3 × 31,557,600).
What is 30 yr in seconds?
30 yr = 946,728,000 s (since 30 × 31,557,600).
What is 150 yr in seconds?
150 yr = 4,733,640,000 s (since 150 × 31,557,600).
How many decimals should I keep when converting yr to s?
Match the precision of your original measurement. For example, 315,576,000 s rounds to 316,000,000 s at 3 significant figures; keep more digits only for engineering or scientific work.
More in Time converters
- Days to Minutes Converter
- Years to Days Converter
- Days to Seconds Converter
- Weeks to Years Converter
- Days to Weeks Converter
- Weeks to Seconds Converter
See all time converters tools · All Conversion calculators · Site map
Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the second