Time Unit Converter: Seconds, Minutes, Hours, Days
Convert minutes to hours, seconds to minutes, or any unit from milliseconds to weeks, with each answer as a decimal and in hours and minutes.
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- Decimal and h:mm:ss answers
- Milliseconds to weeks
Time unit converter
Two parts are read as hours:minutes. For 3 min 57 s, type 0:03:57.
90 minutes =
That's 1 hour 30 minutes
- Clock style
- 1:30:00
- How it's worked out
- 90 minutes ÷ 60 = 1.5 hours
In every unit
How to convert minutes to hours and other units
To convert minutes to hours, divide by 60. Every time unit here is a fixed multiple of the next smaller one, so any conversion is one multiply or divide:
| Unit | Equals |
|---|---|
| 1 second | 1,000 milliseconds |
| 1 minute | 60 seconds |
| 1 hour | 60 minutes = 3,600 seconds |
| 1 day | 24 hours = 1,440 minutes = 86,400 seconds |
| 1 week | 7 days = 168 hours = 604,800 seconds |
Going to a smaller unit, multiply. Going to a bigger unit, divide. So 2.5 hours × 60 = 150 minutes, and 90 minutes ÷ 60 = 1.5 hours.
Getting minutes and seconds instead of a decimal
Dividing 237 seconds by 60 gives 3.95 minutes, which is right but not how most people say it. To get minutes and seconds, divide and keep the remainder:
- 237 ÷ 60 = 3, with 57 left over (3 × 60 = 180, and 237 − 180 = 57).
- The whole number is the minutes and the remainder is the seconds: 3 minutes 57 seconds.
The same works one level up: 150 minutes ÷ 60 = 2 with 30 left over, so 150 minutes is 2 hours 30 minutes. The converter shows both forms for every answer.
Decimal hours vs clock time
A decimal like 1.5 hours and a clock reading like 1:30 are the same length of time written two ways. The decimal counts fractions of an hour, so .5 is half an hour and .25 is a quarter. Clock style counts minutes out of 60.
| Decimal hours | Minutes |
|---|---|
| 0.25 | 15 minutes |
| 0.5 | 30 minutes |
| 0.75 | 45 minutes |
| 1.75 | 1 hour 45 minutes |
To go from a decimal to minutes, multiply the decimal part by 60. To go the other way, divide the minutes by 60 and add them to the hours. The guide to adding and subtracting time walks through this with a total of several times.
Common conversions
Every answer in this table comes from the same code as the converter. Pick Convert to load a row into the tool.
| Convert | Answer | In words | Load into the converter |
|---|---|---|---|
| Minutes to hours | |||
| 15 minutes | 0.25 hours | 15 minutes | Convert |
| 20 minutes | ≈ 0.333333 hours | 20 minutes | Convert |
| 30 minutes | 0.5 hours | 30 minutes | Convert |
| 45 minutes | 0.75 hours | 45 minutes | Convert |
| 60 minutes | 1 hour | 1 hour | Convert |
| 90 minutes | 1.5 hours | 1 hour 30 minutes | Convert |
| 100 minutes | ≈ 1.666667 hours | 1 hour 40 minutes | Convert |
| 120 minutes | 2 hours | 2 hours | Convert |
| 150 minutes | 2.5 hours | 2 hours 30 minutes | Convert |
| 180 minutes | 3 hours | 3 hours | Convert |
| 240 minutes | 4 hours | 4 hours | Convert |
| 300 minutes | 5 hours | 5 hours | Convert |
| Seconds to minutes | |||
| 30 seconds | 0.5 minutes | 30 seconds | Convert |
| 45 seconds | 0.75 minutes | 45 seconds | Convert |
| 60 seconds | 1 minute | 1 minute | Convert |
| 90 seconds | 1.5 minutes | 1 minute 30 seconds | Convert |
| 100 seconds | ≈ 1.666667 minutes | 1 minute 40 seconds | Convert |
| 120 seconds | 2 minutes | 2 minutes | Convert |
| 180 seconds | 3 minutes | 3 minutes | Convert |
| 300 seconds | 5 minutes | 5 minutes | Convert |
| 600 seconds | 10 minutes | 10 minutes | Convert |
| 900 seconds | 15 minutes | 15 minutes | Convert |
| Hours to days | |||
| 12 hours | 0.5 days | 12 hours | Convert |
| 24 hours | 1 day | 1 day | Convert |
| 36 hours | 1.5 days | 1 day 12 hours | Convert |
| 48 hours | 2 days | 2 days | Convert |
| 72 hours | 3 days | 3 days | Convert |
| 100 hours | ≈ 4.166667 days | 4 days 4 hours | Convert |
| 168 hours | 7 days | 7 days | Convert |
| Seconds in each unit | |||
| 1 minute | 60 seconds | 1 minute | Convert |
| 1 hour | 3,600 seconds | 1 hour | Convert |
| 1 day | 86,400 seconds | 1 day | Convert |
| 1 week | 604,800 seconds | 7 days | Convert |
| Milliseconds | |||
| 1 second | 1,000 milliseconds | 1 second | Convert |
Time unit questions
How many hours is 90 minutes?
90 minutes is 1.5 hours, or 1 hour 30 minutes. Divide the minutes by 60: 90 ÷ 60 = 1.5.
How many hours is 120 minutes?
120 minutes is exactly 2 hours, because 120 ÷ 60 = 2.
How many seconds are in a day?
86,400. A day has 24 hours, each hour has 60 minutes, and each minute has 60 seconds, so 24 × 60 × 60 = 86,400. A week is 7 times that, 604,800 seconds.
How do I convert seconds to minutes and seconds?
Divide by 60 and keep the remainder. 412 ÷ 60 is 6 with 52 left over, so 412 seconds is 6 minutes 52 seconds. As a decimal it's about 6.87 minutes.
Why isn't 1.5 hours the same as 1 hour 50 minutes?
The .5 means half an hour, and half of 60 minutes is 30. Decimal hours count in tenths and hundredths of an hour, while clock time counts minutes out of 60, so 1.5 hours is 1:30.
How do I turn decimal hours into minutes?
Multiply the decimal part by 60. For 2.25 hours, 0.25 × 60 = 15, so it's 2 hours 15 minutes. For the whole amount in minutes, multiply all of it by 60: 2.25 × 60 = 135 minutes.
How many milliseconds are in a second?
1,000. To turn milliseconds into seconds, divide by 1,000, so 1,500 milliseconds is 1.5 seconds.
Why aren't months and years included?
They don't have a fixed length. Months run from 28 to 31 days and some years have 366 days, so the answer would depend on which month or year you mean. A week is always 7 days, so weeks are included.
Does every day have exactly 86,400 seconds?
For everyday timekeeping, yes, and this converter uses 86,400. The US National Institute of Standards and Technology explains that a leap second is sometimes added to Coordinated Universal Time to keep it in step with astronomical time, so on those days UTC runs 23:59:59, then 23:59:60, then 00:00:00.
Sources
- NIST Time and Frequency Division, "Leap Seconds FAQs" (what a leap second is), nist.gov
Related tools
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- Time in ExcelWhy Excel stores a day as 1 and an hour as 1/24.
- Speech length calculatorTurn a word count into minutes and seconds of speaking time.
Cedrick Reese built this converter for TimerCalculator.com. It turns every amount into whole milliseconds and does its math on whole numbers, so long decimals don't pick up rounding errors, and the common conversions table is generated by the same code as the converter. Before this version was put online, a scripted browser run converted 90 minutes (1.5 hours), 237 seconds (3 minutes 57 seconds), 36 hours (1.5 days), and 1 week (604,800 seconds) and matched each result.