Time Unit Converter
Convert between milliseconds, seconds, minutes, hours, days and weeks. Includes the conversion factors and worked examples.
Results
Result
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Educational estimates · not financial advice · free, no signup
Formula / how it works
1 minute = 60 s; 1 hour = 60 min = 3,600 s; 1 day = 24 h = 86,400 s; 1 week = 7 days = 604,800 s; 1 s = 1,000 ms.
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
Time units are not decimal: sixty seconds in a minute, sixty minutes in an hour, twenty-four hours in a day and seven days in a week. Converting between them by hand invites errors, especially for decimals like 1.5 hours. This converter takes a value, the unit you start with and the unit you want, and applies the exact factors. It is useful for timers, cooking, project plans, timesheets and programming, where milliseconds and seconds matter. Months and years are not included because their lengths vary, so use a date calculator for calendar spans.
When to use / who it helps
- You need to turn hours into minutes or seconds for a timer.
- You are converting a duration for a spreadsheet or timesheet.
- You are working with milliseconds in code.
- You are planning a project in days and weeks.
- You want to check mental arithmetic.
How to use
Steps
- Enter the value.
- Choose the From unit.
- Choose the To unit.
- Read the converted result.
- Swap units to check the reverse conversion.
- Use decimal hours for payroll, or the time-to-decimal tool for hours and minutes.
How to interpret results
- 1 hour is 60 minutes or 3,600 seconds.
- 1 day is 1,440 minutes or 86,400 seconds.
- 1 week is 168 hours.
- A decimal such as 1.5 hours is 1 hour 30 minutes, not 1 hour 50 minutes.
- Calendar months and years are not fixed lengths and are excluded here.
Common mistakes & gotchas
- Treating 0.5 hours as 50 minutes.
- Dividing by 100 instead of 60.
- Forgetting that a day has 24 hours.
- Mixing milliseconds and seconds in code.
- Using 30 days as a month for precise calculations.
Worked example
Worked example — 2.5 days in other units
- Hours: 2.5 × 24 = 60 hours.
- Minutes: 60 × 60 = 3,600 minutes.
- Seconds: 3,600 × 60 = 216,000 seconds.
- Weeks: 2.5 ÷ 7 ≈ 0.357 weeks.
Result: 2.5 days equals 60 hours, 3,600 minutes or 216,000 seconds.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
1 minute = 60 s; 1 hour = 60 min = 3,600 s; 1 day = 24 h = 86,400 s; 1 week = 7 days = 604,800 s; 1 s = 1,000 ms.
Frequently asked questions
How many seconds are in a day?
86,400.
How many minutes are in a week?
10,080.
How do I convert minutes to hours?
Divide by 60.
Why isn't a month included?
Months vary from 28 to 31 days, so the length is not fixed.
How many milliseconds are in a second?
1,000.
How do I convert 1.25 hours to minutes?
Multiply by 60 to get 75 minutes.