Free Time Converter Online

The Time Converter is a free online tool that converts between seconds, minutes, hours, days, weeks, months, and years.

Yes, it is completely free with no registration required. All conversions happen client-side in your browser.

The Time Converter supports milliseconds, seconds, minutes, hours, days, weeks, months, and years for comprehensive time unit conversions.

Absolutely. The Time Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Time Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Time Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Time Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

It depends on which year you mean. A common 365-day year has exactly 31,536,000 seconds, because 365 days times 86,400 seconds per day. A leap year of 366 days has 31,622,400 seconds. For general conversions this tool uses the average 365.25-day year, which accounts for leap years over time and works out to 31,557,600 seconds. That quarter-day is why a single billion seconds is roughly 31.7 years rather than a clean 31 or 32. The same logic applies to smaller units: an hour is 3,600 seconds and a day is 86,400 seconds. Rather than memorize these figures or risk a slipped digit, type your value into the Time Converter, pick seconds and years, and read the exact equivalent instantly.

Both conversions use a factor of 60, because there are 60 minutes in an hour and 60 seconds in a minute. To go from hours to minutes, multiply by 60: 2.5 hours becomes 150 minutes. To go from minutes to seconds, multiply by 60 again: 150 minutes is 9,000 seconds. Working backward, you divide instead of multiply, so 9,000 seconds divided by 60 gives 150 minutes. The tricky part is that time is not decimal, so 1.5 hours is 90 minutes, not 150, a mistake that is easy to make under pressure. The Time Converter handles the arithmetic for you: enter a value, choose hours and minutes (or minutes and seconds), and the result updates the moment you type, so chained conversions never drift.

Most time units stack cleanly: 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day. Months and years break that pattern because they are not fixed lengths. Calendar months range from 28 to 31 days, and years vary between 365 and 366 days depending on leap years. To give consistent answers, this converter treats a month as a standard 30 days and a year as 365.25 days, the long-run average that absorbs leap years. That means converted months and years are approximations suited to estimates and durations, not exact calendar dates. When you need the real number of days between two specific calendar dates, use the built-in date calculator instead, which counts actual days, weeks, and months for the exact period you enter.

Switch to the date calculator tab inside the Time Converter and enter a start date and an end date. The tool reports the span between them broken down into years, months, weeks, and days, so you can see a project's length or count down to a deadline at a glance. Unlike converting an abstract value such as "3 months," the date calculator counts the actual calendar days in your chosen range, which correctly handles months of differing lengths and any leap days that fall in between. This makes it reliable for things like billing periods, contract terms, age in days, or how long ago an event happened. Pick your two dates and the duration appears instantly, with everything calculated locally in your browser so your dates stay private.

Planck time is the shortest physically meaningful interval in physics, about 5.39 x 10 to the minus 44 seconds, and it is one of the 28 units this converter supports alongside specialist scales like the shake (10 nanoseconds) and sidereal year. Numbers that small, or extremely large ones like millennia in nanoseconds, have far too many digits to write out in full, so the tool automatically switches to scientific notation, which expresses a value as a number times a power of ten. This keeps results readable instead of a long string of zeros. You can toggle the scientific display on or off and set how many decimal places you want, giving you control over precision for both everyday and scientific work. Enter any value above to see it expressed across all 28 units at once.