Convert Weeks to Seconds
Weeks to seconds is the conversion you need when a long stretch of time — a project timeline, a countdown, a subscription period — has to be expressed in the smallest common unit. One week is exactly 604,800 seconds, so the number gets a lot bigger when you switch from weeks to seconds.
Weeks to Seconds conversion table
| Weeks (wk) | Seconds (s) |
|---|---|
| 1 | 604,800 |
| 2 | 1,209,600 |
| 3 | 1,814,400 |
| 5 | 3,024,000 |
| 10 | 6,048,000 |
| 20 | 12,096,000 |
| 50 | 30,240,000 |
| 100 | 60,480,000 |
| 500 | 302,400,000 |
| 1,000 | 604,800,000 |
The formula
To convert weeks to seconds, multiply the number of weeks by 604,800:
seconds = weeks × 604800
A worked example
Say you want to convert 4 weeks into seconds:
4 × 604800 = 2,419,200 seconds
That's just over 2.4 million seconds — a useful number to know if you're setting a time-to-live value or a countdown for a four-week period.
Why the number is exact
A week is built from exact definitions: 7 days, each made of 24 hours, each made of 60 minutes, each made of 60 seconds. None of those relationships involve measurement or rounding — they're fixed by definition. So multiplying weeks by 604,800 always gives an exact number of seconds, down to the last digit.
When you'll use it
Setting expiry times for caches, cookies, or tokens; configuring countdown timers; working with APIs that expect durations in seconds; and converting subscription or trial periods into the units a system actually stores.
Frequently asked questions
How many seconds are in a week?
Exactly 604,800 seconds. This isn't a rounded estimate — it falls straight out of how a week, day, hour, minute, and second are defined relative to each other.
Is the weeks to seconds conversion exact?
Yes. A week is defined as exactly 7 days, a day as exactly 24 hours, an hour as exactly 60 minutes, and a minute as exactly 60 seconds. Multiply those together and you get 604,800 seconds, with no rounding anywhere in the relationship.
Why would I need to convert weeks into seconds?
It comes up when working with countdown timers, server session lengths, cache expiry settings, or any system that measures time in seconds but you're thinking in weeks.