Volume Conversion between
Imperial and Metric
. . . . . . .
. . . . . . . . .
1. Our Training Videos
Skills Application: Volume Conversion between Imperial and Metric
Step-by-Step: Volume Conversion between Imperial and Metric
. . . . . . . . .
2. Running with Pi

Tagged in


Correct metric conversions can mean the difference between safety and hazard.


In 1983 Air Canada flight 143 was being serviced and filled up with enough jet fuel to make the flight from Montreal and Edmonton. Jet fuel is pumped out from tanker trucks in gallons which needed to be converted into kilograms. Being new to the metric system the ground crew made an incorrect conversion. As a result of this math error the plane ran out of fuel mid-flight and was facing imminent devastation. However, through the extraordinary skills of the pilots they were able to glide the plane and safely land it at an Air Force base in Gimli, Manitoba with zero fatalities. This is where the euphemism “Gimli Glider” originates.

Volume Conversion
between Imperial
and Metric

Image is not available

Running with Pi

Image is not available
. . . . . . . . .
3. Our Training Worksheets

The units inch, foot, yard and mile are called Imperial or US Customary units of measure of length and the cube of them are called Imperial or US Customary units of measure of volume.

Conversion between Imperial Units of Measure of Volume

Volume Measure

The following are some common conversions for volume.

1 cubic foot = 1728 cubic inches
1 cubic yard = 27 cubic feet
1 US gallon = 231 cubic inches
1 Imperial gallon
277.42 cubic inches
1 cubic foot ≈ 7.48 US gallons
1 cubic foot ≈ 6.23 US gallons

Note: Not all of the above conversion rates are exact figures. The figures show after the ≈ sign have further infinite decimal digits.

1. To convert from cubic feet to cubic inches, cubic yards to cubic feet, and cubic miles to cubic yards, we use multiplication.


        2 cubic feet = 1728 x 2 = 3456 cubic inches since 1 cubic foot = 123 cubic inches.

2. To convert from cubic yards to cubic miles, cubic feet to cubic yards, and cubic inches to cubic feet, we use division.


        54 cubic feet = 54 ÷ 27 = 2 cubic yards because 27 cubic feet = 1 cubic yard


Metric Units of Measure of Volume

There is another system for measurement which is called metric system. The units of measuring Volume are derived from units of measure of length, which are millimeter, centimeter, meter and kilometer. Volume units are cubic millimeter, cubic centimeter, cubic meter, cubic kilometer. One can change any unit in the metric system to the others very easily.


Metric Volume Units

1 cubic centimeter (cm3) = 1000 cubic millimeters (mm3)
1 cubic decimeter (dm3) = 1000 cubic centimeter (cm3)
1 cubic meter (m3) = 1000 cubic decimeter (dm3)

1. To convert from cubic meters to cubic decimeter, cubic decimeters to cubic centimeters, and cubic centimeters to cubic millimeters, we use multiplication.


2 cubic meters = 2 x 1000 = 2000 cubic decimeters since 1 cubic meter = 1000 cubic decimeter. (1 dm3 is also known as a Liter)

2. To convert from cubic decimeter to cubic meters, cubic centimeters to cubic decimeters, and cubic millimeters to cubic centimeters, we use division.


4000 cubic centimeter = 4000 ÷ 1000 = 4 cubic decimeters because 1000 cubic centimeter = 1 cubic decimeter.


A Short Review

You need to know 2 things:

  • the conversion factor, and
  • the magnitude of units to be converted. (i.e. which is bigger)

For example that m3 is bigger than dm3 and not the other way around.

If converting a bigger unit to a smaller, multiply by the conversion factor.

5 ft3 = 5 x 1728 = 8640 in3

5 m3 = 5 x 1000 = 5000 dm3

If converting from a smaller to a bigger, divide by the conversion factor.

5 in3 = 5 ÷ 1728 = 0.0028 in3

5 dm3 = 5 ÷ 1000 = 0.005 m3

GetMath Worksheet Level1 novertspaac

Worksheet: Level 1

The operations used are clearly specified. Only one type of mathematical operation is used in a task.

Worksheet: Level 1 Sample Questions


  1. Since 3 feet make a yard, what is the conversion factor between ft³ and yd³

Further examples:

What is the conversion factor between:

  1. feet and inches?
  2. cubic feet and cubic inches?
  3. cm and m?
  4. cm3 and m3?

Worksheet: Level 1 Answer Key


  1. 3 × 3 × 3 = 27

Download Worksheet: Level 1

GetMath Worksheet Level2 novertspaac

Worksheet: Level 2

Tasks involve one or two types of mathematical operation. Few steps of calculation are required.

Worksheet: Level 2 Sample Questions


Convert the following amount:

(Remember, conversion factor is 1728 between in³ and ft³)

  1. 3 ft³ = ___ in³ ?

Further examples:

Convert the following:

  1. 31.4 m3 = _____ cm3
  2. 62,503 in3 = _____ ft3

Worksheet: Level 2 Sample Answer Key


Convert the following amount:

  1. 3ft³ = 3 × 1728 = 5184 in³

Download Worksheet: Level 2

GetMath Worksheet Level3 novertspaac

Worksheet: Level 3

Tasks require a combination of operations. Several steps of calculation are required.

Worksheet: Level 3 Sample Questions


Convert the following amount:

(Remember, conversion factor is 1760³ between yd³ and mi³)

  1. 7.5 ft³ = ___ mi³

Further examples:

Convert the following:

  1. 42,150,000 mm3 = _____ km3
  2. 84.5 in3 = _____ mi3

Worksheet: Level 3 Sample Answer Key


Convert the following amount:

(Remember, conversion factor is 1760³ between yd³ and mi³)


7.5 ft³ = 7.5 ÷ 3³ ÷ 1760³ = 0.00000000005 mi³

Download Worksheet: Level 3


GetMath Worksheet Additional novertspac

Infosheet: Advanced

Tasks involve multiple steps of calculation. Advanced mathematical techniques may be required.

Measurement math connections for trades & technology

Length or Distance is a 1-D or 1 dimensional concept. It means it runs in 1 direction or in a single line. For this reason it is called linear. It can be measured directly with rulers, tape measures, reflected laser beams in distance finders.

There are many synonyms or alternative names for Length. Some of these names include radius, caliber, depth, or edge. (See table below) These are all linear concepts. Any 3 of these can combine to indicate Volume. For example Length, Width, and Thickness can combine to express the Volume of wood that makes a maple shelf, or Height, Width and Depth can combine to express the Volume a bookcase takes up fully assembled.

Volume or space is a 3-D or 3 dimensional concept. It can relate to hollow or solid objects (3-D things). It spreads in 3 linear directions in all 3 surface plains of space. For this reason objects are called volumetric or spatial. Volume or space can not directly be measured since measurement tools are linear. Volumetric “measurements” are always calculated from linear measurements. Some digital instruments say they “measure” Volume/Space, but it cannot be measured directly. These instruments calculate volume or space from reflected laser beam Distance measurements.

Volume or space can be inside or outside, hollow or solid, very irregular or very geometric. Inside or outside volume can be partial or full.

Volume or space can be measured in Metric or Imperial units, many of these are used only in specific industries. For example grain harvest size in bushels is mostly applicable to grain storage and transport. Volume of wood in trees or logs measured in cords or board feet only relates to logging and lumber production. Space inside a combustion chamber of an engine in cubic inches is only used in automotive parts context. Suitcase, bag and garment sizes and suitability for air travel is concern for manufacturing industry.

Many units of measure of Volume/space originate from linear units of measure but are modified to reflect that they are used for expressing size of Volume. In this process linear units of measure become volumetric/spatial. Examples include in → in3, km → km3, yd → yd3.

Sometimes these units can be spelled this way: cu.ft. or cubic feet, cu. kms or cubic kilometers. Regardless of spelling variations they are still volumetric/spatial units of measure for Volume.

Some other units of measure words show no relation to linear units, but they are. Examples include board foot (= a piece of wood, 1 inch thick, 1 foot long & 1 foot wide), Imperial gallon (= the volume of 10 pounds of water at 62 °F (17 °C), 1 pound = weight of a platinum cylinder 1.35 inches high, and 1.15 inches diameter), a US gallon (= 231 in3). For more on the differences between Volume and Capacity, see Episode 28 Advanced.

Some volumetric units of measure are funny or anecdotal, they work unofficially as figures of speech. “A 10-gallon hat” relates to volume, so does “a sinkhole the size of 5 Olympic swimming pools”. It could be meaningfully used to indicate Volume during rescue or evacuation.

Conversion Table

Property of matter being measured:
possible synonyms
Unit of measure
Imperial & US
Distance (1-D)
in straight line:
straight lines of circles:
loops (full or part) & :
length, width, height,
depth, thickness, gauge,
side, edge, strain
L or l, w, h,
d, th, ga.
s, e, e (greek epsilon)
and other prefixes (kilo, centi, …)

mile, fathom

furlong, yard

feet, inch,




mi, fm

fur, yd,

ft, in
diameter, caliber, bore
radius, chord
d or Ø, cal, b or Ø,
 r, ch
perimeter, circumference, arc, stroke
p or P, c,
a, s
Volume (3-D)
(empty space)
space, inside
meter cubed
and other prefixes (kilo, centi, …)

cubic mile

cubic yard

cubic feet

cubic inch
dry ounce
dry gallon





space, inside
and other prefixes (kilo, centi, …)

gallon, quart

pint, gill

fluid ounce, table and tea spoon

ga, qt
pt, gl
fl-oz, tbsp., tsp


course list off
basic calculator off
scientific calculator off