Convert time instantly between seconds, minutes, hours, days, weeks, months, and years — plus a smart HH:MM:SS input mode. This tool is made to be fast, shareable, and practically useful for studying, workouts, productivity, cooking, coding, travel planning, and “how long is that in hours?” moments.
Enter a value and pick “From” and “To.” Tip: if you type HH:MM:SS (like 1:30:00), the calculator automatically understands it.
Time conversion is one of the simplest (and most useful) kinds of unit conversion because it is mostly based on fixed ratios. For example, there are exactly 60 seconds in one minute and exactly 60 minutes in one hour. That means we can convert almost any time amount by using a consistent “base unit” and multiplying/dividing.
This calculator uses seconds as the base unit. That makes the logic clean: input → seconds → output. Here’s the general formula:
1) Convert input to seconds:
seconds = value × secondsPerUnit(fromUnit)
2) Convert seconds to the target unit:
result = seconds ÷ secondsPerUnit(toUnit)
Months and years are not fixed-length units the same way seconds/minutes/hours are. February has fewer days than March, and leap years add extra days. That’s why we label these as average:
If you’re converting “how many months is 90 days,” an average is often fine. If you’re doing calendar-exact scheduling (“three months from today”), use a calendar/date calculator instead.
If you input time like HH:MM:SS (for example 1:30:00), we treat it as hours, minutes, seconds and convert it to: totalSeconds = hours×3600 + minutes×60 + seconds. We also support shorter forms: MM:SS (like 12:05) is treated as 12 minutes and 5 seconds.
Convert 10,000 seconds to hours. We know 1 hour = 3,600 seconds. So: hours = 10,000 ÷ 3,600 = 2.777... That’s about 2.78 hours — or roughly 2 hours 46 minutes 40 seconds (because 0.777...×60 ≈ 46.6 minutes).
Convert 90 minutes to hours. Since 60 minutes = 1 hour: hours = 90 ÷ 60 = 1.5. That’s 1 hour 30 minutes — and if you pick HH:MM:SS as your output unit, you’ll see 01:30:00.
Convert 1:30:00 to minutes. First convert to seconds: 1×3600 + 30×60 + 0 = 5400 seconds. Then convert to minutes: 5400 ÷ 60 = 90 minutes. This is exactly why HH:MM:SS is so handy for timers and workouts.
1 week = 7 days. weeks = 14 ÷ 7 = 2 weeks. Simple—but it’s still the kind of conversion that shows up constantly in planning and scheduling.
The tool is built for speed: enter a value, choose units, click convert. But if you want the most useful (and shareable) result, here are a few tips that make your conversions clearer and more screenshot-friendly:
If you’re converting something that comes from a stopwatch, workout timer, cooking timer, or video length, HH:MM:SS is the most natural format. People read 01:45:30 faster than “1.7583 hours.” So if your output is going to be shown to others (or copied into a post), consider converting to HH:MM:SS.
Under your result, we show a mini table of equivalents across multiple units (seconds/minutes/hours/days/weeks/months/years). This is a built-in “sanity check.” If something looks off, you can spot it instantly.
Some numbers are oddly satisfying and share well. For example: 10,000 seconds, 1,000 minutes, 500 hours, or 2,000,000 seconds. Convert one of those and screenshot the result—people love surprising time comparisons.
If you repeatedly convert the same kind of values (like “minutes per day” → “hours per week”), saving your conversions gives you a little personal reference list on the device you use most.
Privacy note: saved conversions stay in your browser storage. Nothing is sent to a server.
Yes for fixed units (seconds, minutes, hours, days, weeks). For months and years, the results are approximate because calendar months vary in length and leap years exist.
Because a month is not always 30 days. We use a calendar average (about 30.436875 days per month and 365.2425 days per year). If you need exact date counting, use a date difference calculator.
Type it like 1:30:00 (hours:minutes:seconds). You can also type 12:05 for minutes:seconds. If you pick “HH:MM:SS” as the From unit, the calculator expects this format.
Yes. Enter 2.5, choose “Hours” → “Minutes,” and you’ll get 150 minutes. Decimals are great for work logs and time estimates.
After the page loads once, it often works offline depending on your browser cache. The conversions run entirely in JavaScript, so no internet is required for the math itself.
Use a date/datetime tool. “Time unit conversion” is about pure durations (like 72 hours), while “date difference” is about calendar time between two timestamps (which can include daylight saving time changes).
MaximCalculator provides simple, user-friendly tools. Always sanity-check important numbers if they affect deadlines, medication schedules, travel connections, or safety-critical timing.