Year to Second Conversion Calculator: Free Online Tool

Convert years to seconds with our free online time converter.

From:

Year

To:

Second

How to Use the Calculator:

Enter the value you want to convert in the 'From' field (Year).
The converted value in Second will appear automatically in the 'To' field.
Use the dropdown menus to select different units within the Time category.
Click the swap button (⇌) to reverse the conversion direction.

How to Convert Year to Second

Converting Year to Second involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

1 Year = 3.1557e+7 seconds

Example Calculation:

Convert 60 years: 60 × 3.1557e+7 = 1.8934e+9 seconds

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

What is a Year and a Second?

A year is a unit of time based on the orbital period of the Earth around the Sun. A standard calendar year has 365 days, while a leap year has 366 days. For scientific and conversion purposes, the Julian year is often used, defined as exactly 365.25 days (or 31,557,600 seconds).

The second is the base unit of time in the International System of Units (SI). It is defined by taking the fixed numerical value of the caesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9,192,631,770 when expressed in the unit Hz, which is equal to s⁻¹.

Note: The Year is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Second belongs to the imperial/US customary system.

History of the Year and Second

Calendars have been developed since antiquity to track the seasons, crucial for agriculture. Early calendars (e.g., Egyptian) approximated the solar year. The Julian calendar introduced the leap year concept (every 4 years) to better align with the ~365.25 day solar year. The Gregorian calendar refined this further by adjusting the leap year rule (skipping leap years in century years not divisible by 400) for even greater accuracy relative to the tropical year (time between vernal equinoxes).

Historically, the second was defined as 1/86,400 of a mean solar day. However, variations in the Earth's rotation led to the need for a more precise, constant definition. The atomic definition based on the caesium-133 atom was adopted in 1967.

Common Uses for years and seconds

Explore the typical applications for both Year (imperial/US) and Second (imperial/US) to understand their common contexts.

Common Uses for years

Calendars & Dating: The fundamental unit for long-term dating and tracking historical events.
Age: Standard unit for measuring the age of people, animals, objects, and historical periods.
Cycles: Measuring long durations such as astronomical cycles, geological periods, project timelines, fiscal periods (fiscal year), academic periods (academic year).
Anniversaries & Celebrations: Marking annual events like birthdays, holidays, and anniversaries.
Interest Rates & Finance: Often used as the basis for calculating annual interest rates (APR) and financial reporting.

Common Uses for seconds

Base Unit: The fundamental unit for all time measurements in science, engineering, and daily life.
Timing: Used universally for clocks, watches, timers, and scheduling.
Physics: Essential in defining derived units like velocity (meters per second), acceleration (meters per second squared), frequency (Hertz, or cycles per second), and force (Newtons).
Computing: Used as a base for measuring intervals, timeouts, and durations, although often subdivided into milliseconds, microseconds, or nanoseconds for finer measurements.
Everyday Life: Counting heartbeats, measuring short durations, coordinating activities.

Frequently Asked Questions

Questions About Year (yr)

How many days are in a year?

A common year has 365 days. A leap year has 366 days.

What is a leap year?

A leap year occurs generally every 4 years and includes an extra day (February 29th) to keep the calendar year synchronized with the astronomical or seasonal year.

Why is 365.25 days often used for a year in calculations?

This represents the average length of a year in the Julian calendar system, accounting for the leap day every four years. It provides a consistent value for conversions and scientific contexts.

How many seconds are in a Julian year?

There are 31,557,600 seconds in a Julian year (365.25 days * 86,400 seconds/day).

About Second (s)

What is the base unit of time in the SI system?

The second (s) is the base unit of time.

Why is the second defined using atoms?

The atomic definition provides a much more stable and precise standard than relying on the Earth's rotation, which fluctuates slightly.

How many seconds are in a minute?

There are 60 seconds in a minute.

How many seconds are in an hour?

There are 3,600 seconds in an hour (60 seconds/minute * 60 minutes/hour).

Conversion Table: Year to Second

Year (yr)	Second (s)
1	31,556,952
5	157,784,760
10	315,569,520
25	788,923,800
50	1,577,847,600
100	3,155,695,200
500	15,778,476,000
1,000	31,556,952,000

All Time Conversions

Second to Minute Second to Hour Second to Day Second to Week Second to Month Second to Year Second to Millisecond Second to Microsecond Second to Nanosecond Second to Decade Second to Century Second to Millennium Second to Fortnight Second to Planck Time Second to Shake Second to Sidereal Day Second to Sidereal Year Minute to Second Minute to Hour Minute to Day Minute to Week Minute to Month Minute to Year Minute to Millisecond Minute to Microsecond Minute to Nanosecond Minute to Decade Minute to Century Minute to Millennium Minute to Fortnight Minute to Planck Time Minute to Shake Minute to Sidereal Day Minute to Sidereal Year Hour to Second Hour to Minute Hour to Day Hour to Week Hour to Month Hour to Year Hour to Millisecond Hour to Microsecond Hour to Nanosecond Hour to Decade Hour to Century Hour to Millennium Hour to Fortnight Hour to Planck Time Hour to Shake Hour to Sidereal Day Hour to Sidereal Year Day to Second Day to Minute Day to Hour Day to Week Day to Month Day to Year Day to Millisecond Day to Microsecond Day to Nanosecond Day to Decade Day to Century Day to Millennium Day to Fortnight Day to Planck Time Day to Shake Day to Sidereal Day Day to Sidereal Year Week to Second Week to Minute Week to Hour Week to Day Week to Month Week to Year Week to Millisecond Week to Microsecond Week to Nanosecond Week to Decade Week to Century Week to Millennium Week to Fortnight Week to Planck Time Week to Shake Week to Sidereal Day Week to Sidereal Year Month to Second Month to Minute Month to Hour Month to Day Month to Week Month to Year Month to Millisecond Month to Microsecond Month to Nanosecond Month to Decade Month to Century Month to Millennium Month to Fortnight Month to Planck Time Month to Shake Month to Sidereal Day Month to Sidereal Year Year to Minute Year to Hour Year to Day Year to Week Year to Month Year to Millisecond Year to Microsecond Year to Nanosecond Year to Decade Year to Century Year to Millennium Year to Fortnight Year to Planck Time Year to Shake Year to Sidereal Day Year to Sidereal Year Millisecond to Second Millisecond to Minute