Time Converter

Convert between seconds, minutes, hours, days, weeks, months, years, decades, and centuries instantly.

Type a value in any field. All other units update instantly.

s
min
hr
d
wk
mo
yr
dec
cen

How to Use the Time Converter

  1. Type any value. Enter a number in any time unit field. All 9 units update simultaneously with no button to press.
  2. Convert in any direction. Need to know how many seconds are in a year? Type 1 in the Year field. How many hours in 10,000 minutes? Type 10000 in the Minute field.
  3. Month and year definitions. This converter uses 30.44 days per month (365.25 / 12) and 365.25 days per year to account for leap years. These are average values, not calendar-exact.
  4. Use decimals for precision. You can enter 1.5 hours to get 90 minutes, or 2.5 days to see its equivalent in hours, minutes, and seconds.

Example: a standard 40-hour work week. Type 40 in the Hour field to see: 144,000 seconds, 2,400 minutes, 40 hours, 1.66667 days, 0.238095 weeks, 0.054759 months.

Time Conversion Formulas

All conversions use seconds (s) as the base unit:

Value in seconds = Input × toSeconds factor
Result in target unit = Value in seconds ÷ toSeconds factor
UnitSeconds1 second equals
1 second1 s1 s
1 minute60 s0.016667 min
1 hour3,600 s0.000277778 hr
1 day86,400 s0.0000115741 d
1 week604,800 s1.6534×10^-6 wk
1 month (avg)2,629,728 s3.8026×10^-7 mo
1 year (365.25 d)31,557,600 s3.1689×10^-8 yr
1 decade315,576,000 s3.1689×10^-9 dec
1 century3,155,760,000 s3.1689×10^-10 cen

Key reference: 1 year = 365.25 days = 8,766 hours = 525,960 minutes = 31,557,600 seconds. The extra 0.25 day accounts for leap years (one extra day every 4 years on average).

Frequently Asked Questions

There are 31,557,600 seconds in a year, using the Julian year definition of 365.25 days. If you use exactly 365 days, you get 31,536,000 seconds. The difference of 21,600 seconds (6 hours) accounts for the quarter-day that accumulates into a leap year every 4 years. A common approximation used in science is "pi × 10^7" seconds per year, which gives 31,415,927 seconds, accurate to about 0.45%.

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