UnitConvConvert
yr
Timeeverydayscientific

What is a year?

Earth's orbital period — 365.25 days (Julian year)

Definition

The Julian year equals 365.25 days — the time for Earth to complete one orbit around the Sun. The Gregorian civil year averages 365.2425 days thanks to the leap-year rule. Most unit conversion uses the Julian value.

Common uses

  • Age, anniversaries and legal tenure
  • Interest rate calculations
  • Astronomy and science

🌍 Real-world scale

Human average lifespan: 73 years (global). EU adult age: 18 years. Typical mortgage: 25–30 years.

Convert from years

9 conversions
Year to Second1 yr = 31,557,600 sYear to Millisecond1 yr = 31,557,600,000 msYear to Minute1 yr = 525,960 minYear to Hour1 yr = 8,766 hYear to Day1 yr = 365.25 dYear to Week1 yr = 52.1786 wkYear to Month1 yr = 12.0002 moYear to Decade1 yr = 0.1 decYear to Century1 yr = 0.01 c

Convert to years

9 conversions
Second to Year1 s = 3.1688e-8 yrMillisecond to Year1 ms = 3.1688e-11 yrMinute to Year1 min = 1.9013e-6 yrHour to Year1 h = 0.0001141 yrDay to Year1 d = 0.002738 yrWeek to Year1 wk = 0.01916 yrMonth to Year1 mo = 0.08333 yrDecade to Year1 dec = 10 yrCentury to Year1 c = 100 yr

Tips

  • Julian year = 365.25 days = 31,557,600 seconds.
  • Gregorian civil year averages 365.2425 days (97 leap days in 400 years).
  • Astronomical "year" can be tropical (365.2422 d), Julian (365.25 d) or sidereal (365.2564 d).

Common mistakes

  • Using 360 days/year (financial convention) in scientific calculations.
  • Confusing Julian and tropical years in precise astronomy.
  • Mixing fiscal year (varies by country) with calendar year.

FAQ about the year

What is a year?
The Julian year equals 365.25 days — the time for Earth to complete one orbit around the Sun. The Gregorian civil year averages 365.2425 days thanks to the leap-year rule. Most unit conversion uses the Julian value.
Where is the year used?
The year is commonly used for: Age, anniversaries and legal tenure; Interest rate calculations; Astronomy and science.
What is an example of a year in real life?
Human average lifespan: 73 years (global). EU adult age: 18 years. Typical mortgage: 25–30 years.
What category does the year belong to?
The year is a unit of time, part of the 10-unit time category on UnitConv.
How accurate are year conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 10 time units and their conversions.⏱️ Time hub →