ToolKit

Value Converter Tools

Free Online Value Converter Tools

Instant unit and value conversion tools that run entirely in your browser. Convert time durations, numeric values, and units between any format — no calculations needed, no data sent to any server.

Time Converter
Convert seconds, minutes, hours, days, weeks, years
Live

Why use a browser-based converter?

Value converters are some of the most frequently needed utilities in everyday computing — yet most online converters are cluttered with ads, require page refreshes, or send your input to a server. Every converter on ToolKit runs locally in your browser with zero network requests.

Whether you're a developer calculating cache TTLs in seconds, a project manager converting sprint durations to days, or a student converting between units — instant, clean results without friction is what matters.

All conversion logic is handled by pure JavaScript in your browser tab. There is nothing to install, no signup required, and no rate limits.

Value Converter best practices

Use seconds as the common denominator
When working across multiple time units in code, store durations in seconds. Convert to human-readable units only for display — it prevents off-by-one errors and timezone confusion.
Days vs calendar months
A month is not a fixed unit — it can have 28, 29, 30 or 31 days. Use days or weeks for precise duration calculations rather than "months" wherever possible.
Know your year length
A standard year has 365 days, a leap year 366. For precise calculations over multi-year periods, always account for leap years rather than assuming 365 days × N.
Milliseconds for code, seconds for humans
APIs and databases typically store timestamps as milliseconds (Unix ms). Human-readable displays should use seconds or larger units. Keep the conversion explicit in your code.

FAQ

Common questions

How many seconds are in a day?

There are exactly 86,400 seconds in a day: 60 seconds × 60 minutes × 24 hours = 86,400.

How many seconds are in a year?

A standard year has 31,536,000 seconds (365 × 86,400). A leap year has 31,622,400 seconds (366 × 86,400).

How many weeks are in a year?

A year has 52 weeks and 1 day (or 2 days in a leap year). Precisely: 52.1775 weeks on average when accounting for the leap year cycle.

Are these converters accurate for programming?

Yes. The converters use exact integer arithmetic for whole-unit conversions. Fractional results are shown to sufficient decimal precision for most use cases.

Do these tools work offline?

Once the page is loaded, all conversion logic runs in your browser with no network requests. You can save the page and use it offline.

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