Convert time units — seconds, minutes, hours, days, weeks, months, years.
| Unit | Name | Value |
|---|---|---|
| ms | Millisecond | 2592000000 |
| s | Second | 2592000 |
| min | Minute | 43200 |
| hr | Hour | 720 |
| d | Day | 30 |
| wk | Week | 4.2857143 |
| yr | Year | 0.082191781 |
Formula: Year = Month × 0.08333
Multiply any month value by 0.08333 to get year.
Reverse: Month = Year × 12
Common month values — factor: 1 mo = 0.08333 yr
| Month (mo) | Year (yr) | Context |
|---|---|---|
| 1 mo | 0.08333 yr | One month |
| 3 mo | 0.25 yr | One quarter |
| 6 mo | 0.5 yr | Half year |
| 9 mo | 0.75 yr | 3 quarters |
| 12 mo | 1 yr | One year |
| 18 mo | 1.5 yr | 1.5 years |
| 24 mo | 2 yr | Two years |
| 36 mo | 3 yr | 3 years |
| 60 mo | 5 yr | 5 years |
| 120 mo | 10 yr | 10 years |
| 240 mo | 20 yr | 20 years |
| 360 mo | 30 yr | 30 years |
| 600 mo | 50 yr | 50 years |
| 1,200 mo | 100 yr | One century |
| 1.2e+04 mo | 1,000 yr | One millennium |
Months ÷ 12 = years. Exact.
12 mo = 1 yr, 24 mo = 2 yr, 120 mo = 10 yr.
Years × 12 = months.
Prepares monthly financial statements, budgets, and cash flow forecasts.
Structures monthly billing cycles for SaaS, streaming, and membership products.
Calculates monthly repayment schedules and loan terms in months.
Tracks pregnancy progression in months and gestational weeks.
Plans monthly sales targets, promotional calendars, and inventory reviews.
Manages monthly software release cycles and sprint retrospectives.
The month originated with the lunar cycle (~29.5 days), used by ancient Mesopotamian, Egyptian, and Chinese calendars. The Gregorian calendar months (28–31 days) are a solar compromise that drifts from the lunar cycle.
Months define billing cycles, salary periods, pregnancy tracking, and seasonal planning. The average Gregorian month is 30.437 days; this conversion uses 30.44 days (2,629,800 seconds) as the standard average.
Interesting fact: The word 'month' derives from 'moon' in Germanic languages. Islam and the Hebrew calendar still use lunar months, which is why Ramadan and Passover shift relative to the Gregorian calendar each year.
The year (approximately 365.25 days) is defined by Earth's orbital period around the Sun. Julius Caesar introduced the Julian calendar (365.25 days) in 45 BCE; Pope Gregory XIII refined it to the Gregorian calendar in 1582 to correct accumulated drift.
Years organize human civilization: fiscal years, academic years, election cycles, and long-term planning. The Julian year (exactly 365.25 days = 31,557,600 seconds) is used as a standard in astronomy and this converter.
Interesting fact: A year on Venus is shorter than its day — Venus takes 225 Earth days to orbit the Sun but 243 Earth days to rotate once. A year on Neptune lasts 164.8 Earth years.
Converting month to year is a common task across science, engineering, and everyday planning. The time scale spans from nanoseconds in computing to centuries in history, and having accurate conversions helps when comparing measurements across different systems or disciplines.
As a quick reference: 5 mo = 0.4167 yr and 10 mo = 0.8333 yr. For the reverse: 1 yr = 12 mo. The exact conversion factor is 1 mo = 0.08333 yr.
All conversions are performed in IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.