How many seconds are in a year? Use this easy and mobile-friendly calculator to convert between years and seconds. Just type the number of years into the box and hit the Calculate button. 365 days × 24 hours × 60 minutes × 60 seconds = 31,536,000 seconds. In words, there are thirty one million, five hundred thirty-six thousand seconds in a standard year. Learn how to calculate the number of seconds in a year, common and leap, and how it varies depending on speed and gravity. Explore the perception and uses of time in different fields and cultures. So, we take the 3,600 seconds per hour and multiply it by 24 hours. This gives us 86,400 seconds in a day. Step 4: Calculate the number of days in a non-leap year. In a regular, non-leap year, there are 365 days. So, we take the 86,400 seconds in a day and multiply it by 365 days. This comes out to be 31,536,000 seconds in a non-leap year.