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How Many Seconds
in a Day? (Sec/Day)

Free Online Calculator to Convert
Time From any Unit to any Unit


Number of Seconds in a Day

There are 86,400 Seconds in a day. How do you calculate this? Well, it’s pretty easy!

A day is a unit of time that represents one complete rotation of the Earth around its axis. It is divided into 24 hours. Each hour is made up of 60 minutes. Each minute is made up of 60 seconds. So, to find the number of seconds in one day, we need to multiply the number of seconds in one hour by the number of hours in a day.

Seconds in one day = Seconds per minute (60) × Minutes per hour (60) × Hours per day (24) = 86,400 Seconds.


What about the calculator?


This calculator is a time conversion tool. ⌚

It allows you to convert between different units of time, ranging from very small units like picoseconds (one trillionth of a second) to very large units like a millennium (a thousand years).

Please Note: The calculator assumes 30-Day Months, and 365-Day Years. (Not 28 or 31 Days).

Here’s how it works:


You enter a number in one of the two input fields. (This is the amount of time you want to convert). Then select the corresponding time unit from the dropdown under it.

The other input field and dropdown menu will automatically update to show the converted value in the selected time unit under it.


What if I wanna swap?


Simply type on the other input field …

It’s already a bi-directional calculator.


Nice 👍 Love it!

How Many Seconds in a Year?


There are 31,536,000 Seconds in One Year. A year is a unit of time that represents one complete orbit of the Earth around the Sun. To understand how many seconds are in a year, we need to break it down into smaller units of time: 1 Year = 365 Days, 1 Day = 24 Hrs, 1Hr = 60 Minutes, and 1 Minute = 60 Seconds.

(Therefore 365 X 24 X 60 X 60 = 31,536,000 Seconds)

There are Thirty-one million, five hundred thirty-six thousand seconds within a single year!

How Many Seconds in a Month?

The number of seconds in a month depends on the specific month. Most months have 30 or 31 days, but February has 28 days (or 29 days in a leap year). A day has 24 hours, an hour has 60 minutes, and a minute has 60 seconds. So, here’s a rough estimate:

  • 30-day month: 30 X 24 X 60 X 60 =2,592,000 Sec
  • 31-day month: 31 X 24 X 60 X 60 =2,678,400 Sec
  • 28-day month: 28 X 24 X 60 X 60 =2,419,200 Sec

How Many Seconds in a Week?

There are 604,800 seconds in a week.

This can be found by multiplying the number of seconds in a day (24 hours * 60 minutes * 60 seconds) by the number of days in a week (7).

Why Use Font Size Clamp in Responsive Design?

Equation of Time