Time Converter
Convert between seconds, minutes, hours, and days.
How to Use Time Converter
- 1Enter a time value
- 2Select the unit
- 3See conversions to all other time units instantly
About Time Converter
The Time Converter instantly converts any time duration between all common units: milliseconds, seconds, minutes, hours, days, and weeks. Enter a value in any unit and see all other equivalents displayed simultaneously without needing to perform multiple conversions.
This tool is ideal for programming tasks (converting API timeout values), scientific calculations, cooking timers, and scheduling scenarios where times are expressed in different units. All conversions use exact integer ratios, so results are perfectly accurate.
All processing runs locally in your browser with no server communication. The interface is clean and responsive, making it equally useful on desktop workstations and mobile devices.
Key Features of Time Converter
- Convert between milliseconds, seconds, minutes, hours, days, and weeks
- All unit equivalents shown simultaneously in a single view
- Exact conversion using precise integer ratios (no floating-point error)
- Accepts large values for astronomical or scientific calculations
- Accepts small decimal values for fine-grained time conversion
- Instant results as you type
- Useful for programming API timeouts, scheduling, and scientific work
- Fully browser-based with no server dependency
Supported Formats
Input Formats
Output Formats
All conversions use exact ratios: 1 second = 1000 ms, 1 minute = 60 seconds, 1 hour = 60 minutes, 1 day = 24 hours, 1 week = 7 days.
Examples
Convert minutes to seconds
Find how many seconds are in 90 minutes.
Input
90 minutes
Output
5,400 seconds | 1.5 hours | 0.0625 days
Convert milliseconds to hours
Convert a large millisecond value to human-readable units.
Input
3,600,000 milliseconds
Output
3,600 seconds | 60 minutes | 1 hour
Common Use Cases
- Converting programming timeout values from milliseconds to seconds
- Expressing scientific measurement intervals in multiple units
- Planning events by converting days to hours or weeks
- Converting cooking or baking times between minutes and seconds
- Checking duration consistency across different scheduling systems
- Teaching time unit relationships in educational settings
Troubleshooting
Confusing time duration converter with time-of-day converter
Solution
This tool converts durations (e.g., "how many seconds in 3 hours"). It does not convert between time zones or clock times like 3:00 PM EST to UTC.
Expecting months or years as conversion options
Solution
Months and years have variable lengths (28-31 days, 365-366 days), so they are not included in this precise converter. Use the Date Difference Calculator for month and year intervals.
Entering a negative duration
Solution
Time durations must be positive values. For time difference calculations involving direction or order, use the Date Difference Calculator instead.
Frequently Asked Questions
What time units are supported?
Milliseconds, seconds, minutes, hours, days, and weeks. Months and years are excluded because they have variable lengths.
How many seconds are in a day?
There are exactly 86,400 seconds in a day (24 hours x 60 minutes x 60 seconds). The converter uses this exact ratio.
Can I convert very large time values?
Yes. The calculator handles large values accurately. For example, you can convert the number of milliseconds in a year (approximately 31.5 billion ms) without precision loss.
Can I convert decimal fractions of a unit?
Yes. Enter 1.5 hours to see the equivalent in minutes (90), seconds (5400), and milliseconds (5,400,000).
Why are months and years not included?
Months range from 28 to 31 days, and years are 365 or 366 days. Including them would require assumptions that make the converter imprecise. Use the Date Difference Calculator for month/year intervals.
Can I use this for programming timeout values?
Yes. If a library requires a timeout in milliseconds and you think in seconds, enter your value in seconds to instantly see the milliseconds equivalent.
Is the converter accurate for all values?
Yes. All conversions use exact integer ratios, so there is no floating-point rounding error for whole-number inputs.
Is my data private?
Yes. All conversions run entirely in your browser. No values are transmitted to any server.