Calculator
Enter an amount and a unit to see it converted into every other time unit at once — including the exact answer to "how many seconds are in a year."
"How many seconds in a year" doesn't have one universal answer, because a year itself isn't a fixed length. A plain 365-day calendar year is exactly 31,536,000 seconds. But the actual average length of a year (accounting for leap years, per the Gregorian calendar's 365.2425-day average) is 31,556,952 seconds — about 10.9 minutes longer. Both are used depending on context; this tool shows both so you can pick the one that matches your situation.
Months range from 28 to 31 days, so any single "seconds in a month" figure is necessarily an average, not exact for any specific calendar month. This tool uses 30.44 days (365.2425 ÷ 12), the standard convention — for an exact count in one specific month, use the Date Difference Calculator instead.
Related
The exact day count between two real calendar dates.
hh:mm:ss style durations, converted to a total.
The formal P#Y#M#DT#H#M#S format, decoded.