How to Use This Tool
Enter a Value
Type the time value you want to convert into the input field. Decimals and scientific notation are supported.
Choose Your Units
Pick a From unit and a To unit from the dropdowns. Use the swap button to flip them instantly.
Read the Result
The converted value appears instantly below the inputs. Click Copy to put it on your clipboard.
See All Conversions
Scroll down to see the same value converted into every other supported unit at once, from nanoseconds to centuries.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser with no server costs.
Is my data sent to a server?
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No. All conversion math happens directly in your browser. Nothing you type is ever sent anywhere.
What units are supported?
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12 units: Nanosecond, Microsecond, Millisecond, Second, Minute, Hour, Day, Week, Month, Year, Decade, and Century.
How is a Month defined?
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A month is treated as exactly 30 days for conversion purposes. Real calendar months vary between 28 and 31 days, but 30 is the standard average used for quick conversions.
How is a Year defined?
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A year is treated as 365.25 days, which accounts for leap years averaged over time. This is the standard value used in scientific and general-purpose time conversions.
How accurate are the conversions?
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The tool uses standard conversion factors and displays up to 10 significant figures. Results are accurate for everyday, educational, and professional use.
Can I see all conversions at once?
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Yes. Below the main result, the tool shows the same value converted into every other unit in a scrollable list so you can compare them all at a glance.
Can I swap the From and To units?
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Yes. Click the swap button between the two dropdowns to flip them instantly. The result recalculates right away.
How many seconds are in a year?
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About 31,557,600 seconds (based on 365.25 days). You can verify this by typing 1 with From set to Year and checking the All Conversions list.
Does it support decimals?
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Yes. You can type values like 0.5, 2.5, or 1.5e6. The tool handles all standard number formats.
What Is Time Converter?
Time Converter is a free tool that converts between 12 time units right in your browser. It spans from nanoseconds (billionths of a second) all the way to centuries, covering every common time scale in between: seconds, minutes, hours, days, weeks, months, years, and decades. Nothing you type is ever sent anywhere - all math runs locally on your device.
The result updates live as you type, and a full conversion table shows the same value in every other unit at once. Use the swap button to flip your units instantly, or copy the result to your clipboard in one click.
Features Explained
12 Time Units
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Convert between Nanosecond, Microsecond, Millisecond, Second, Minute, Hour, Day, Week, Month, Year, Decade, and Century.
Tiny Scales
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Nanosecond, Microsecond, and Millisecond for computing, electronics, photography, and science where fractions of a second matter.
Everyday Units
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Second, Minute, Hour, Day, and Week for daily life, scheduling, cooking timers, and project planning.
Long Scales
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Month, Year, Decade, and Century for historical timelines, age calculations, investment periods, and long-term planning.
Standardized Definitions
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Month is treated as 30 days and Year as 365.25 days (accounting for leap years). These are the standard values used for general-purpose time conversions.
Instant Conversion
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The result updates live as you type. There is no Convert button to click - you see the answer the moment your input changes.
All Conversions at Once
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Below the main result, a scrollable table shows the same value converted into every other unit simultaneously, from nanoseconds to centuries.
Swap Button
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Click the swap button between the From and To dropdowns to flip them instantly. The result recalculates right away.
Copy to Clipboard
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Click Copy to put the converted value on your clipboard instantly, ready to paste into a document, spreadsheet, or message.
100% Browser-Based
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All conversion math runs directly in your browser. Nothing you type is ever sent to any server - complete privacy.
Who Is This Tool For?
Students
Convert time units for physics, math, and science homework. Know how many seconds are in a year or how many milliseconds in a minute.
Teachers
Demonstrate time conversions in real time during lessons and help students understand the relationships between time scales.
Software Developers
Convert between milliseconds, seconds, and minutes when working with timers, delays, timeouts, and performance measurements.
Project Managers
Convert project durations between hours, days, weeks, and months for scheduling, estimates, and milestone planning.
Scientists
Convert between nanoseconds, microseconds, and seconds for experimental timing, decay rates, and measurement precision.
Video Editors
Convert clip durations between seconds, minutes, and hours, or between milliseconds and frames for precise timing.
Musicians
Convert beat durations and tempo intervals between milliseconds and seconds for music production and timing.
Runners and Athletes
Convert race times and training intervals between seconds, minutes, and hours for performance analysis.
Astronomers
Convert cosmic time spans between years, decades, centuries, and seconds for research and public outreach.
Historians
Convert time periods between years, decades, and centuries for historical research and timelines.
Photographers
Convert shutter speeds between fractions of a second and milliseconds to understand exposure times.
Cooks and Bakers
Convert cooking and baking times between minutes and hours, or seconds and minutes for precise recipes.
Fitness Trainers
Convert workout intervals between seconds and minutes for circuit training, HIIT, and rest periods.
Game Developers
Convert animation frame times and tick rates between milliseconds and seconds for smooth gameplay timing.
Parents
Convert your child's age between days, weeks, months, and years for milestones and health checkups.
Investors
Convert investment periods between months, years, and decades for compound interest and return calculations.
HR Professionals
Convert work hours between hours, days, and weeks for payroll, leave tracking, and labor compliance.
Travelers
Convert flight times and layovers between minutes and hours for trip planning.
Event Planners
Convert event durations between minutes, hours, and days for scheduling and logistics.
Medical Professionals
Convert medication intervals and procedure times between seconds, minutes, and hours.
Engineers
Convert timing specifications between nanoseconds, microseconds, and milliseconds for electronics and signal processing.
Writers
Estimate reading times and word counts by converting between minutes and hours for articles and books.
Podcast Hosts
Convert episode durations between minutes and hours for planning and platform requirements.
Anyone
Quickly convert any time duration for any reason - homework, cooking, scheduling, curiosity, or work.
Tips for Best Results
Common time facts
1 minute = 60 seconds, 1 hour = 3,600 seconds, 1 day = 86,400 seconds, 1 week = 604,800 seconds, 1 year = about 31.56 million seconds.
Month and Year are approximations
A month is treated as 30 days and a year as 365.25 days. These are standard averages - real months vary between 28 and 31 days.
Use the All Conversions table
Scroll below the main result to see the same value in every other unit at once, from nanoseconds all the way to centuries.
Use the swap button
Click the swap button between the dropdowns to flip From and To instantly instead of changing both dropdowns manually.
Copy the result in one click
Click Copy next to the result to put the value on your clipboard, ready to paste into a document, spreadsheet, or message.
Tiny units for computing
Nanoseconds and microseconds are used in computing and electronics. One millisecond is 1,000 microseconds, and one microsecond is 1,000 nanoseconds.
Decades and centuries for history
A decade is 10 years and a century is 100 years. Use these for historical timelines and long-term planning.
Scientific notation for extremes
For very large or very small values, type scientific notation like 1e9 (one billion) or 5e-6 instead of counting zeros.
Half values work too
Type 0.5 to convert half a unit. For example, 0.5 hours = 30 minutes, or 2.5 days = 60 hours.
Privacy is built in
Nothing you type is ever sent to any server. All math runs in your browser, so your data stays completely private.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
