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Imperial Units

Learn about common imperial units and how they relate to other units of measurement

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Units of capacity

Gallon refers to the imperial gallon which was used in the United Kingdom, Ireland, Canada, Australia, New Zealand, and some Caribbean countries but not the USA.

Quart as the name suggests is a quarter of a gallon.

Pint - the imperial pint is about 20% larger than the American pint.

Fluid ounce is almost exactly the same as the volume of pure water weighing one ounce.

1 gallon = 4 quarts1 quart = 2 pints1 pint = 20 fluid ounces

This is level 3: units of capacity. You will be awarded a trophy if you get at least 14 correct and you do this activity online.


What is the abbreviation or symbol used for pints?


What is the abbreviation or symbol used for gallons?


What is the abbreviation or symbol used for fluid ounces?


How many pints are in a gallon?


How many fluid ounces are in a quart?


How many fluid ounces are in a gallon?


How many pints are in 9 gallons?


How many fluid ounces are in 2 quarts?


How many fluid ounces are in 4 gallons?


How many pints are equivalent to 80 fluid ounces?


How many gallons are equivalent to 64 pints?


How many quarts are equivalent to 120 fluid ounces?


I planned to drink a pint of water with breakfast but only managed 14 fl oz. How many fluid ounces less than a pint did I drink?


Rolland used up seven and a half pints of milk from the fridge during this last week.
How many fluid ounces is that equivalent to?


A large water bottle holds a pint and a half of water. How many times could it be refilled from a water tank containing twelve gallons?


Divide 5qt by eight giving your answer as a number of fluid ounces.


Subtract 7gal 5pt from 15gal 2pt giving your answer as a number of pints.


A particular bee hive produces an average of 4.4 fl oz of honey each day. Calculate the number of gallons of honey produced by that hive in a year giving your answer to the nearest whole number.


Suzies's toy bucket has a capacity of seven pints. Suzie's older brother has a fist tank with a capacity of seven gallons. How many times larger is the capacity of the fish tank than the toy bucket?


Find one eigth of twenty six gallons. Give your answer as a number of quarts.


🎼 A litre of water's a pint and three quarters 🎶

This is Imperial Units level 3. You can also try:
Level 1 Level 2


Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.

Why am I learning this?

Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?

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Featured Activity

Nine Digits

Nine Digits

Arrange the given digits one to nine to make three numbers such that two of them add up to the third. This is a great puzzle for practicing standard pen and paper methods of three digit number addition and subtraction.


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Learning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths page is an alphabetical list of free activities designed for students in Secondary/High school.

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Are you looking for something specific? An exercise to supplement the topic you are studying at school at the moment perhaps. Navigate using our Maths Map to find exercises, puzzles and Maths lesson starters grouped by topic.


If you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows:

Alternatively, if you use Google Classroom, all you have to do is click on the green icon below in order to add this activity to one of your classes.

It may be worth remembering that if should go offline for whatever reason, there is a mirror site at that contains most of the resources that are available here on

When planning to use technology in your lesson always have a plan B!

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Description of Levels


Level 1 - Units of length

Level 2 - Units of weight

Level 3 - Units of capacity

Exam Style Questions - A collection of problems in the style of GCSE or IB/A-level exam paper questions (worked solutions are available for Transum subscribers).

More on this topic including lesson Starters, visual aids, investigations and self-marking exercises.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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Curriculum Reference

See the National Curriculum page for links to related online activities and resources.

Conversion Information

1 mile = 1760 yards1 yard = 3 feet1 foot = 12 inches

1 ton = 160 stones1 stone = 14 pounds1 pound = 16 ounces

1 gallon = 4 quarts1 quart = 2 pints1 pint = 20 fluid ounces


Compared to metric units

The sign ≈ means approximately equal to.

1 inch ≈ 2.5cm

5 miles ≈ 8 km

2.2 lb (pounds) ≈ 1kg

1.75 pints ≈ 1 litre

1 gallon ≈ 4.5 litres


Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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Just when I thought I knew all of the imperial units I heard Matt Parker (Standup Maths) list them all, even the more obscure ones, in this wonderful monologue. When you hear their names and their relative sizes you cannot help but be grateful for the metric system which is more common today.

Matt Parker's Imperial Units

More or Less Podcast Matt Parker's Website Transum Podcast

This audio excerpt is from an excellent podcast from BBC Radio 4 called More or Less: Behind the Stats in which Tim Harford tries to make sense of the statistics which surround us. It's well worth a listen if you have an interest in mathematics and statistics and provides real world examples of the maths we learn in school.