Time Converter

Yes, the RoughTools Time Converter is completely free with no account, subscription, or payment required. You can convert between seconds, minutes, hours, days, weeks, months, and years as many times as needed at no cost. RoughTools is funded through non-intrusive advertising, keeping every converter permanently free. There are no usage limits, no premium time units behind a paywall, and no registration required.

No account, email address, or registration is required. Enter a value and select your source unit — the converter instantly shows the equivalent in all supported time units simultaneously. There is no login wall, no upgrade required, and no data stored about your conversions. The converter is entirely anonymous and can be used unlimited times without any sign-up process.

No. All conversions run entirely within your browser using JavaScript. The values you enter are never transmitted to RoughTools servers, never logged, and never shared with any third party. Once you close the browser tab, all data is gone. Your duration calculations remain completely private — whether you are converting project timelines, subscription periods, data retention windows, or scientific time measurements.

Yes, the converter is fully responsive and works on all modern smartphones and tablets. All input fields and the results panel are optimised for touch screens. This is useful when calculating project durations, subscription periods, service level agreement timeframes, or converting time values from technical documentation while on your mobile device or tablet.

The Time Converter works in all modern browsers: Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, Opera, and Brave on both desktop and mobile. No plugins or extensions are required. The converter uses standard JavaScript arithmetic that runs natively in every current browser. Any current version of Chrome, Firefox, or Safari on desktop or mobile is fully supported.

The sub-day conversions (seconds, minutes, hours) are exact: 1 minute = exactly 60 seconds, 1 hour = exactly 3,600 seconds, 1 day = exactly 86,400 seconds. Weeks are exact: 1 week = exactly 7 days. Months and years use averages because calendar months vary: this converter uses 30.4375 days per month (365.25 ÷ 12) and 365.25 days per year — the standard average accounting for leap years. For calendar-specific calculations involving exact dates, use a date difference calculator.

Once the page has fully loaded in your browser, all conversions run in JavaScript without requiring an active internet connection. You can enter time values and see all unit conversions offline after the initial page load. The initial page load requires internet access, but after that the converter functions entirely client-side. This is useful when reviewing technical documentation, project plans, or data retention policies away from reliable internet access.

To convert a time duration: (1) Enter the numeric value in the input field. (2) Select the source unit — for example, Hours. (3) The results panel instantly shows the equivalent in all other units simultaneously: seconds, minutes, days, weeks, months, and years. Results update in real time as you type. This is useful for billing calculations, SLA monitoring, data retention planning, or any scenario requiring duration conversion across multiple time scales simultaneously.

Search engines convert between one pair of time units at a time. RoughTools Time Converter shows all supported units simultaneously in one view — enter a value in any unit and all others update instantly. This is far more efficient when you need to cross-reference seconds, hours, and days simultaneously, such as when configuring server cache TTLs, retention policies, subscription durations, or project timelines that mix different time unit conventions across teams and systems.

To report a bug or request an additional unit — such as milliseconds, microseconds, nanoseconds, fortnights, decades, centuries, or Unix timestamps — use the feedback link in the site footer or visit the RoughTools contact page. When reporting a bug, include the value and unit you entered, the browser and OS, and the incorrect result versus what you expected. Feature requests for microsecond precision or Unix epoch conversion are reviewed and prioritised regularly.

One day has exactly 86,400 seconds (24 × 60 × 60). One week has exactly 604,800 seconds (7 × 86,400). One common year has 31,536,000 seconds (365 × 86,400) and one leap year has 31,622,400 seconds (366 × 86,400). Using the average year of 365.25 days gives 31,557,600 seconds per year. These numbers appear frequently in computing, networking, and system administration — for example, TLS certificate validity, HTTP cache headers (max-age), token expiry, and data retention policy durations.

Unlike seconds, minutes, hours, and days which are fixed exact durations, months and years vary in length. Calendar months range from 28 to 31 days — February alone changes between years. A year is 365 days normally but 366 in a leap year. For duration conversions, this tool uses average values: 30.4375 days per month (365.25 ÷ 12) and 365.25 days per year. This gives a statistically correct average but will differ from the actual calendar duration for any specific date range. For exact date-to-date calculations, use a calendar-based date difference tool.