Year (Avg) to Week (yr to wk)
Result
52.1775 Week
Formula
wk = yr × 52.1775
1 yr = 52.1775 wk, and 1 wk = 0.01916534905 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 × 52.1775 = 52.1775 wk
- 10 yr × 52.1775 = 521.775 wk
- 100 yr × 52.1775 = 5,217.75 wk
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 Week table
| Year (Avg) (yr) | Week (wk) |
|---|---|
| 1 | 52.1775 |
| 2 | 104.355 |
| 5 | 260.8875 |
| 10 | 521.775 |
| 20 | 1,043.55 |
| 50 | 2,608.875 |
| 100 | 5,217.75 |
| 1,000 | 52,177.5 |
The units
- Year (Avg) (yr)
- 1 Year (Avg) = 31,556,952 Second.
- Week (wk)
- 1 Week = 604,800 Second.
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