Time Unit Converter
How many seconds are in a day, how many weeks in a month or how many minutes in a year? Convert any time unit exactly, from milliseconds to years. Months and years use their average length, so weeks and months always line up.
Result
86,400
Result
Formula
Result = value × (seconds per from-unit ÷ seconds per to-unit)
Every time unit has a fixed number of seconds: 1 minute = 60 s, 1 hour = 3,600 s, 1 day = 86,400 s, 1 week = 604,800 s. The calculator converts your value to seconds first and then to the target unit. For months and years it uses the average Gregorian length (1 year = 365.2425 days, 1 month = 1 year ÷ 12).
Step by step
- 1Enter the value and choose the unit to convert from.
- 2Choose the unit to convert to.
- 3Read the result.
Worked examples
How many seconds in a day?
→ 86,400 seconds.
How many weeks in a month?
→ On average 4.35 weeks.
Reference table
| Unit | In seconds |
|---|---|
| 1 minute | 60 |
| 1 hour | 3,600 |
| 1 day | 86,400 |
| 1 week | 604,800 |
| 1 month (avg.) | 2,629,746 |
| 1 year (avg.) | 31,556,952 |
Month and year are averages (1 year = 365.2425 days).
Common mistakes
- Assuming a month is exactly 4 weeks; it averages 4.35.
- Confusing seconds and milliseconds: 1 second = 1000 milliseconds.
- Forgetting a year is 365.2425 days (leap years), not always 365.
When to use it
- Converting a deadline in days into hours or weeks.
- Comparing a pregnancy duration in weeks and months.
- Working out how many seconds or minutes a task takes in total.
Frequently asked questions
How many seconds are in a day?
86,400 seconds: 24 hours × 60 minutes × 60 seconds.
How many weeks are in a month?
On average 4.35 weeks (30.44 days ÷ 7). A specific month has 4 to just over 4.4 weeks.
How many minutes is 1000 seconds?
About 16.67 minutes (1000 ÷ 60).
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