New Tool: Duration Converter
How Many Seconds Are in a Day, Again?
If you have ever had to work out how many milliseconds are in a day, or how many seconds fit into a week, the new Duration Converter does it for you instantly. It converts a single duration across every common fixed-length unit at once.
Live Multi-Field Sync
There is no "Convert" button to press. Type a number into any field and every other field updates immediately:
- Milliseconds
- Seconds
- Minutes
- Hours
- Days
- Weeks
Enter 90000 in the milliseconds field and you instantly see 90 seconds, 1.5 minutes, and the fractional equivalents in hours, days, and weeks. Fractional input works in either direction, so 43200000 milliseconds correctly becomes 0.5 days.
A Plain-Language Summary
Alongside the numeric fields, a read-only Human Readable line breaks the duration down into something you can read at a glance — for example 2 days, 4 hours, 30 minutes. It is handy for sanity-checking a large millisecond value pulled from a log or configuration file.
When to Reach for It
- Developers translating timeouts, intervals, and cache TTLs between milliseconds, seconds, and days
- System administrators interpreting durations in logs and config files
- Data analysts converting elapsed-time measurements between units
- Anyone answering quick "how long is this, really?" questions
A Note on Months and Years
The tool intentionally stops at weeks. Months and years vary in length, so converting to them would mean guessing — and a converter should not guess. For working with actual calendar dates and timestamps, reach for the Date and Timestamp Converter instead, which handles Unix timestamps, ISO 8601, and more.
Privacy First
Like every tool on PowerDev.Tools, the Duration Converter runs entirely in your browser. Your data never leaves your machine — no server-side processing, no tracking, and no accounts required. Install the PWA and it works offline too.
Try It Out
Head over to the Duration Converter and give it a try. As always, it is free, private, and works offline.
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