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1.5 hours is therefore 1 hour and 30 minutes.There are 60 minutes in 1 hour. To convert from minutes to hours, divide the number of minutes by 60. For example, 120 minutes equals 2 hours because 120/60=2.
| min | hr |
|---|---|
| 80.00 | 1.3333 |
| 80.01 | 1.3335 |
| 80.02 | 1.3337 |
| 80.03 | 1.3338 |
| Minutes | Hours | Hours |
|---|---|---|
| 75 min | 1.25 hr | 1.258 hr |
| 75.01 min | 1.25 hr | 1.258 hr |
| 75.02 min | 1.25 hr | 1.259 hr |
| 75.03 min | 1.25 hr | 1.259 hr |
| Time | Hours | Minutes |
|---|---|---|
| 01:10:00 | 1.167 hrs | 70 min |
| 01:20:00 | 1.333 hrs | 80 min |
| 01:30:00 | 1.5 hrs | 90 min |
| 01:40:00 | 1.667 hrs | 100 min |
Contents
How many hours is 1 hour 30 minutes?
1.5 hours is therefore 1 hour and 30 minutes.
Is 60 minutes an 1 hour?
There are 60 minutes in 1 hour. To convert from minutes to hours, divide the number of minutes by 60. For example, 120 minutes equals 2 hours because 120/60=2.
How many minutes is 75 minutes?
| Minutes | Hours | Hours |
|---|---|---|
| 75 min | 1.25 hr | 1.258 hr |
| 75.01 min | 1.25 hr | 1.258 hr |
| 75.02 min | 1.25 hr | 1.259 hr |
| 75.03 min | 1.25 hr | 1.259 hr |
What is 80 minutes as a decimal?
| Time | Hours | Minutes |
|---|---|---|
| 01:10:00 | 1.167 hrs | 70 min |
| 01:20:00 | 1.333 hrs | 80 min |
| 01:30:00 | 1.5 hrs | 90 min |
| 01:40:00 | 1.667 hrs | 100 min |
How do you write 45 minutes in hours?
To convert time to just hours:
45 minutes is 45 minutes * (1 hour / 60 minutes) = 45/60 hours = 0.75 hours.
How long is half an hour?
Definition of half an hour
: 30 minutes I waited for half an hour.
How long is an hour?
An hour is most commonly defined as a period of time equal to 60 minutes, where a minute is equal to 60 seconds, and a second has a rigorous scientific definition. There are also 24 hours in a day.
Why is a minute not 100 seconds?
Who decided on these time divisions? THE DIVISION of the hour into 60 minutes and of the minute into 60 seconds comes from the Babylonians who used a sexagesimal (counting in 60s) system for mathematics and astronomy. They derived their number system from the Sumerians who were using it as early as 3500 BC.
How many minutes are in a minute?
The minute is a period of time equal to 1/60 of an hour or 60 seconds. The minute is an SI accepted unit for time for use with the metric system. Minutes can be abbreviated as min; for example, 1 minute can be written as 1 min.
What is 15 of an hour?
| Minutes | Tenths of an Hour | Hundredths of an Hour |
|---|---|---|
| 14 | .2 | .24 |
| 15 | .2 | .25 |
| 16 | .2 | .26 |
| 17 | .2 | .28 |
What is .67 of an hour?
| Minutes | Decimal Hours | Decimal Hours |
|---|---|---|
| 17 | .28 | .62 |
| 18 | .30 | .63 |
| 19 | .32 | .65 |
| 20 | .33 | .67 |
How many hours is 2.75 hours?
2.75 hours is 2 hours, 45 minutes and 0 seconds.
What is .25 of an hour?
| Minutes | Fraction of an hour |
|---|---|
| 22 | 0.367 |
| 23 | 0.383 |
| 24 | 0.400 |
| 25 | 0.417 |
How do you write 1.5 hours?
In general, for some number of hours, plus some fraction of an hour, you’d use the number, plus the fraction, plus “hours”, plural. “Four and a half hours.”, “Three and three-quarters hours,” etc. However, for the specific case of 1.5 hours, the usual expression is “an hour and a half“.
What does 1/4 of an hour mean?
Answer: 1/4th of an hour is 15 minutes.
How do you convert 1 hour to 40 minutes in hours?
- 1 Hr = 60 Mins. So, 1 Hr = 1 Hr. 40 min = 40/60 hr = 2/3 hr.
- 1 Min = 60 Sec = 1/ 60 Hr.
- 1 Sec = 1/ 60 Min = 1/ 3600 Hr. So, 48 Sec = 48/ 3600 Hr = 1/ 75 Hr.
- 1 Hr 40 Min 48 Sec. => 1 + ( 2/3 ) + ( 1/75 ) => (75 + 50 + 1) / 75. => (126/ 75) Hr.
What is meant by 1.5 hours?
1.5 hours – it is more than the singular ‘hour’. It is another half hour beyond being singular, so it is ‘one AND a half hours‘.
How many hours is one hour?
An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. There are 60 minutes in an hour, and 24 hours in a day.
How do you write 2 hours in 30 minutes?
So, 2 hours 30 minutes is 2 + 30 ÷ 60 = 2.5 hours. To convert to minutes, simply multiply the hours by 60 and add the minutes. So, 2 × 60 + 30 = 150 minutes.
Convert 80 Minutes to Hours
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Quick 75 Minutes to Hours Conversion (min to hr)
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How Long Is 80 Minutes In Hours And Minutes?
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Convert 80 minutes to hours – Time Calculator
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Convert 80 Minutes to Hours
Convert 80 Minutes to Hours
How long is 80 minutes? What is 80 minutes in hours? 80 min to hr conversion (mtoh).
From Centuries Days Decades Hours Hours:Minutes:Seconds Microseconds Millenia Milliseconds Minutes Months Nanoseconds Seconds Weeks Work Weeks Years To Centuries Days Decades Hours Hours:Minutes:Seconds Microseconds Millenia Milliseconds Minutes Months Nanoseconds Seconds Weeks Work Weeks Years swap units ↺ Amount 1.3333333 Hours (rounded to 8 digits) 80 Minutes = Display result as Number Fraction (exact value)
minute is a unit of time equal to 60 seconds. An hour is a unit of time equal to 60 minutes, or 3,600 seconds.
Calculating with Time
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Calculating with Time See also: Numbers
Even otherwise highly numerate people have been known to throw up their hands in horror at the thought of adding together times.
A system like time, which is not decimal, can be counter-intuitive and requires concentration.
However, with a bit of application, you too can learn how to calculate with time, and gain confidence in manipulating hours, minutes and seconds.
Basic Units of Time
The basic units of time, which allow you to do calculations involving time, are:
Unit Notes Second The second is the International System of Units (SI) measurement for time. The symbol ‘s’ is used to denote a second. Seconds are also commonly abbreviated to sec. Minute 60 Seconds A minute nearly always has sixty seconds. However, very occasionally (approx. once every 18 months) a minute can have 61 seconds. These ‘leap seconds’ are used to keep our clocks aligned to the earth’s rotation around the sun. Hour 60 Minutes It is common to talk about ‘half an hour’ (30 minutes) and ‘quarter of an hour’ (15 minutes). Day 24 hours Week 7 days It is also common for people to talk about a work week, usually 5 days (Monday – Friday) and weekends (Saturday and Sunday). Month 28,29, 30 or 31 days. Different months have different numbers of days. All months have either 30 or 31 days except for February. February has 28 days in a common year and an extra day in a leap year; the 29thday of February is called the leap day. Year 12 Months A year always has 12 months. A year has approximately 52 weeks. A common year has 365 days and a leap year (occurring mostly every 4 years) has 366 days. Decade 10 Years Century 100 Years Millennium 1,000 Years
Years are commonly split into quarters, especially in business and education settings, with each quarter being three months or approximately 90 days. Quarters in a specific business or sector may not necessarily be the same as those indicated below:
The number of days in a month varies. All months have the same number of days each year except for February which has 28 days in a common year and 29 in a leap year.
Quarter 1 Quarter 2 Quarter 3 Quarter 4 Month Days Month Days Month Days Month Days January 31 April 30 July 31 October 31 February 28/29 May 31 August 31 November 30 March 31 June 30 September 30 December 31
As the number of days in a month varies, this also means that the number of weeks in a month varies too.
People often use approximations when calculating the number of days in months. For example, it is common to use the assumption that a month contains four weeks, even though only February in a common year actually does so.
This makes it hard to convert from months to weeks and vice versa, unless you know which months are being used, because there is no immediate ‘conversion factor’.
Top Tip! If you are converting between months and weeks, the best way to do so is via years, because they always contain 12 months (even in a leap year). To convert months to weeks, divide by 12 and multiply by 52.
To convert weeks to months, divide by 52 and multiply by 12. The answers you get will be good approximations.
Writing Time
There are many different ways to write time. The simplest (digital) form is as written hh.mm or hh:mm, for example 10.21 or 10:21.
Hours may be either divided into 24 (known as the 24-hour clock) or two lots of 12 (often referred to as the 12-hour clock).
When using the 24-hour clock, the 24 hour cycle starts with the time 00:00 (midnight) and runs all the way through to 23:59, before rolling over to 00:00 again. We never write ‘24:00’. You will often see the time in 24-hour clock written without a separator (‘.’ or ‘:’) between the hours and minutes. For example 1400, which may be referred to as fourteen hundred hours. This is especially common in military and seafaring situations.
When using the 12-hour clock the 24 hour period is divided into two 12-hour periods. Both midnight and midday are 12:00. Time before midday (noon) is designated am (ante meridiem) and time after noon is referred to as pm (post meridiem). For example, 4:10pm is the same time as 16:10. Note that we never write ‘16:10pm’ The use of am and pm is only for the 12-hour clock.
You can also describe time in words, such as ‘ten minutes past/after twelve’, or ‘ten past twelve’. Up to half way through an hour, we describe ‘minutes past’ the hour; beyond ‘half past’ we talk about minutes to/before the next hour. A time ‘on the hour’, for example 2:00pm, can be referred to as ‘two pm’, ‘fourteen hundred’, or ‘two o’clock’.
Calculations of How Much Time has Passed You may need to do calculations of how much time has passed, for example, to work out the end time of an examination, how long you will have to wait for a train, or perhaps to calculate race results. If time is described in words, you will need to convert it into a digital form in order to do any calculations. It is also simpler to use the 24 hour clock to avoid any confusion, unless all your figures are either am or pm.
Example time formats:
Calculating the Passage of Time
In the normal way of things, to calculate how much one thing is greater than another you would simply subtract one from another. However, subtracting time is complicated because it’s not decimal. Instead of the columns being hundreds, tens and units, they are hours, minutes and seconds.
Top Tip If you have a scientific electronic calculator, you will almost certainly have a button that will calculate time. Technically, it’s for degrees but as there are 60 minutes in a degree, and 60 seconds in a minute, you can also use it to calculate time. The button will have a symbol like this: At the very least, you should be able to use that to convert time to decimals and back again, making calculations much easier.
The other way of calculating how much time has passed between Time A and Time B is:
Work out how many minutes from Time A to the next hour (or minute, if in minutes and seconds).
Work out how many hours between that next hour, and the last whole hour before Time B.
Work out how many minutes from the whole hour until time B.
Add these three numbers together.
Worked Examples Pat was due to catch a train at 11.44am, which she has just missed. The next train is not until 1.17pm. How long will she have to wait? Before you start, convert all the numbers to 24-hour clock for ease. 11.44am becomes 1144 and 1.17pm becomes 1317. The number of minutes from 11:44 to 12:00 (the next hour) is 16.
The number of hours from 12:00 to 13:00 is one.
The number of minutes from 13:00 to 13:17 is 17. The total time that Pat will have to wait is 1 hour plus (16 + 17) minutes = 1 hour 33 minutes. I am organising a series of canoe races, and have synchronised clocks for the start and the finish. The plan is for the first race to start at about 30 minutes after synchronisation, then four more races to start at 2-minute intervals after that, but it never works exactly. The starter keeps a record of the exact times, and it turns out that on this occasion, races started at 28:02, 30:00, 32:15, 34:40 and 37:00. The finish line has a clock, which is exactly synchronised with the start clock, and the finisher records the time on the clock when the racers cross the finish line. For each of the following finish times, work out how long the competitor took (click on the + icons to see the working and answers): James was in the first race. He crossed the finish line at 59:02 James started at 28:02 and finished at 59:02. How convenient, there are no additional seconds! You can simply subtract 28 from 59, and discover that he took 31 minutes exactly. Simon was in the fourth race. He crossed the finish line at 1:10:34 Simon started at 34:40 and finished at 1:10:34. It’s probably easier to call that (60+10) = 70:34. From 34:40 to 35:00 is 20 seconds. From 35:00 to 70:00 is 35 minutes. From 70:00 to 70:34 is 34 seconds. Simon therefore took 35 minutes plus 34 seconds plus 20 seconds = 35:54 minutes Mary was in the second race. She crossed the finish line at 1:15:02 Mary started at 30:00 exactly, and finished at 1:15:02, or 75:02. Again, this is quite straightforward. There are no seconds before the next minute, but there are 45 minutes from 30:00 to 75:00, and 2 seconds from 75:00 to 75:02. She therefore took 45:02 minutes.
Calculating the total amount of time spent
Sometimes you might need to add up how much time you have spent on a task that you have completed over several days or sessions. Adding a list of hours and minutes isn’t as straightforward as doing a normal addition calculation, because (as above) we are not working with a decimal system.
For example, you may be doing a gardening job for a neighbour, who has agreed to pay you an hourly rate of £10 per hour. On the first day you spend 3 hours and 25 minutes on the task, on the second day you spend 2 hours and 50 minutes and on the third day you finish it off in an hour and a quarter.
You need to add together the three amounts of time 3:25, 2:50 and 1:15. The first step is to add together all of the minutes: 25 + 50 + 15 = 90 minutes. If you need to remind yourself how to perform an addition calculation, have a look at our page on addition.
As there are only 60 minutes in an hour, the next step is to convert 90 minutes into hours and minutes:
90 ÷ 60 = 1.5 hours
The answer is a decimal, so we can convert it back into hours and minutes. You can use a scientific calculator with a degrees function as described above, or you can do a bit more maths.
We can convert 0.5 hours into minutes.
0.5 × 60 = 30
1.5 hours is therefore 1 hour and 30 minutes.
Next we need to add together the whole hours we have spent, which was 3 on the first day, 2 on the second day and 1 on the third day: 3 + 2 + 1 = 6 hours.
Add the total hours to the total minutes (in hours and minutes):
6h + 1h 30m = 7 hours and 30 minutes, or 7:30 spent gardening. In decimal form, this is 7.5 hours.
In order to calculate how much you have earned, we multiply the time (in decimals) by the hourly rate:
7.5 × 10 = 75. You have therefore earned $75.
Conclusion
The most important thing when calculating with time is to check whether the answer looks about right?
If your two numbers are less than an hour apart, is your answer less than an hour? If they are about 2 hours apart when you look at them, is your answer? If not, you may have lost or gained some time somewhere!
If you want to know more about ‘about right’ take a look at our page on Estimation, Approximation and Rounding.
Converting units: minutes to hours (video)
Video transcript
How many hours are in 549 minutes? And we can write it as a decimal or a fraction. So essentially, we’re going to take 549 minutes and divide them into groups of 60. Why 60? Because we know that one hour is equal to 60 minutes. So it’s essentially saying, how many groups of 60 minutes can we divide 549 into. Or another way of thinking about that is, well, what is 549 divided into groups of 60. This is how many hours we’re going to have. So let’s do that. Let’s take 549 and divide it by 60. So let’s see, 6 goes into 54 9 times. So 60 is going to go into 540 9 times. We’re going to have a little bit left over. So we have 9 times 60 is 540. We subtract. We have 9 left over. And now let’s see, we have a little left over, so we’re going to get a decimal. So let’s put a decimal place right over here and let’s throw some 0’s over there. Let’s bring down a 0. So we bring down a 0. 60 goes into 90 1 time. 1 times 60 is 60. And we subtract. We get 30. Let’s bring down another 0. And so we get to 300. 60 goes into 300 5 times. 5 times 60, 6 times 6 is 30, so 5 times 60 is 300. Subtract and we are done. So you divide 549 into groups of 60. You can divide it into 9.15 groups of 60 minutes. A group of 60 minutes is an hour. So this 549 minutes is 9.15 hours. I want to make sure that we can visualize that properly. So let’s actually construct what 9.15 hours looks like. So let me draw a little line here, and on the top I’ll label Hours, and on the bottom I’ll label Minutes. So this is 0 hours, 0 minutes. And now we have 1 hour, which is 60 minutes. Now we have 2 hours, which is 120 minutes. Then you have 3 hours, which is 180 minutes. Then you have 4 hours, which is 240 minutes. 5 hours is 300 minutes. 6 hours is 360 minutes. 7 hours, I might be running out of space, is for 420 minutes. Let me copy and paste this someplace where I have more real estate. So let me clear that. And then let me paste that someplace where I don’t run into my other math that I did. All right. So then you have 8 hours is 480 minutes. And then you have 9 hours. Notice, I’m just adding 60 minutes every time. 9 hours is 540 minutes. Or another way you could think about it is, well, if each hour is 60, 9 times 60 is 540. And we don’t want to go to just 540. We have another 9 left. So then we have to go another 9 minutes to go to 549. So you have 9 minutes left over. So another way of thinking about this, is that 549 is 9 hours. And then you have 9 minutes left over. And 9 minutes is what fraction of an hour? Well, 60 minutes is a whole hour. So 9 minutes is 9/60 of an hour. So you could write it this way. It’s 9 and 9/60 hours. Or we could write this as an equivalent fraction. 9/60 is the same thing if we divide the numerator and the denominator by 3, is the same thing as 3/20. So we could write this as 9 and 3/20. And 3/20, well we could figure out what that is going to be. Let’s see, 20 divided by 3. It’s definitely going to be smaller than 1, because 3 is smaller than 20. So let’s throw some 0’s on here. 20 doesn’t go into 3, but it does go into 30 1 time. 1 times 20 is 20. Subtract, we get a 10. Bring down a 0. 20 goes into 100 5 times. 5 times 20 is 100. And we are done. So notice, 3 over 20 is the exact same thing. So 9 and 3/20 is the exact same thing as 9 and 15/100. These are all equivalent answers.
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