Year (Avg) to Second (yr to s)
Result
31,556,952 Second
Formula
s = yr × 31,556,952
1 yr = 31,556,952 s, and 1 s = 3.168873851e-8 yr.
The second is the SI base unit, defined by a caesium-133 transition frequency. Minutes, hours, days and weeks are exact multiples. Month and year here are Gregorian averages: a year of 365.2425 days and a month of one twelfth of that (30.436875 days).
Worked examples
- 1 yr × 31,556,952 = 31,556,952 s
- 10 yr × 31,556,952 = 315,569,520 s
- 100 yr × 31,556,952 = 3,155,695,200 s
Common mistakes
- Calendar months run from 28 to 31 days, so "3 months" from a given date is not 3 × 30.44 days. Use a date calculator for deadlines.
- A 365-day year, a 365.25-day Julian year and the 365.2425-day Gregorian year differ; interest and astronomy calculations specify which one they use.
Year (Avg) to Second table
| Year (Avg) (yr) | Second (s) |
|---|---|
| 1 | 31,556,952 |
| 2 | 63,113,904 |
| 5 | 157,784,760 |
| 10 | 315,569,520 |
| 20 | 631,139,040 |
| 50 | 1,577,847,600 |
| 100 | 3,155,695,200 |
| 1,000 | 31,556,952,000 |
The units
- Year (Avg) (yr)
- 1 Year (Avg) = 31,556,952 Second.
- Second (s)
- A unit of time.
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy