Units of Measure Conversions

Introduction

Units of measure are essential tools that help us quantify the world around us. They provide standardized quantities for length, weight, volume, temperature, speed, area, and many other physical properties. However, different cultures, industries, and scientific fields often use different systems of measurement. This is where units of measure conversions become crucial.

The most common systems of measurement are the Metric System, also known as the International System of Units (SI), and the Imperial or U.S. Customary System.

1. The Metric System: This is a decimal-based system, used universally in science and widely around the world for everyday measurements. It includes units such as meters for length, kilograms for mass, liters for volume, and degrees Celsius for temperature.

2. The Imperial/U.S. Customary System: This system is commonly used in the United States and includes units such as inches, feet, and miles for length; pounds and ounces for weight; gallons and ounces for volume; and degrees Fahrenheit for temperature.

Converting between these units allows us to translate measurements from one system to another. For instance, if you know the length of an object in inches, but need to report it in centimeters, you would need to convert from inches (an Imperial unit) to centimeters (a Metric unit).

There are many conversion factors available online and in scientific calculators that enable us to convert from one unit to another. Understanding these conversions and how to apply them is a fundamental skill in many areas of life, from cooking and construction to science and engineering.

Lengths

To convert from inches to centimetres, multiply by 2.5.
Inches Centimetres
1 2.5
2 5
5 13
10 25

Distances

To convert from miles to kilometres, multiply by 1.6 kilometres.
Miles Kilometres
1 1.6
2 3.2
5 8
10 16
20 32
50 80
100 161
200 322
500 805
1000 1609

Speeds

To convert from miles per hour (mph) to kilometres per hour (kph), multiply by 1.6.

The following table lists the conversions into kph for common US speed limits.

Miles per Hour Kilometres per Hour
15 25
25 40
35 55
45 70
55 90
65 105
75 120

Areas

To convert from square miles to square kilometres, multiply by 2.6.

To convert from acres to hectares, multiply by 0.4.

Weights

To convert from ounces to grams, multiply by 28.

To convert from pounds to kilograms, multiply by 0.45.

Liquid Measure

To convert from US gallons to litres, multiply by 3.8.

To convert from US gallons to Imperial (UK) gallons, multiply by 0.8.

Petrol (Gas) Consumption

To convert from miles per US gallon to kilometres per litre, multiply by 0.4.

To convert from miles per US gallon to miles per Imperial (UK) gallon, multiply by 1.2. 

Petrol (Gas) Price Conversion Chart: USA

The following table enables you to convert from a price in US cents per US gallon to a price in UK pence per litre for various Dollar/Pound exchange rates.
US cents per US gallon £1 = $1.20 £1 = $1.30 £1 = $1.40 £1 = $1.50 £1 = $1.60 £1 = $1.70 £1 = $1.80 £1 = $1.90 £1 = $2.00
80 17.61 16.26 15.10 14.09 13.21 12.43 11.74 11.12 10.57
85 18.71 17.27 16.04 14.97 14.04 13.21 12.48 11.82 11.23
90 19.82 18.29 16.98 15.85 14.86 13.99 13.21 12.51 11.89
95 20.92 19.31 17.93 16.73 15.69 14.76 13.94 13.21 12.55
100 22.02 20.32 18.87 17.61 16.51 15.54 14.68 13.91 13.21
105 23.12 21.34 19.82 18.49 17.34 16.32 15.41 14.60 13.87
110 24.22 22.36 20.76 19.37 18.16 17.10 16.15 15.30 14.53
115 25.32 23.37 21.70 20.26 18.99 17.87 16.88 15.99 15.19
120 26.42 24.39 22.65 21.14 19.82 18.65 17.61 16.69 15.85
125 27.52 25.40 23.59 22.02 20.64 19.43 18.35 17.38 16.51
130 28.62 26.42 24.53 22.90 21.47 20.20 19.08 18.08 17.17
135 29.72 27.44 25.48 23.78 22.29 20.98 19.82 18.77 17.83
140 30.82 28.45 26.42 24.66 23.12 21.76 20.55 19.47 18.49
Price of petrol (gas) in the USA 

Petrol (Gas) Price Conversion Chart: Canada

The following table enables you to convert from a price in Canadian cents per litre to a price in UK pence per litre for various Canadian Dollar/Pound exchange rates.
Canadian cents per litre £1 = CDN $1.90 £1 = CDN $2.00 £1 = CDN $2.10 £1 = CDN $2.20 £1 = CDN $2.30 £1 = CDN $2.40 £1 = CDN $2.50 £1 = CDN $2.60 £1 = CDN $2.70
40 21.05 20.00 19.05 18.18 17.39 16.67 16.00 15.38 14.81
45 23.68 22.50 21.43 20.45 19.57 18.75 18.00 17.31 16.67
50 26.32 25.00 23.81 22.73 21.74 20.83 20.00 19.23 18.52
55 28.95 27.50 26.19 25.00 23.91 22.92 22.00 21.15 20.37
60 31.58 30.00 28.57 27.27 26.09 25.00 24.00 23.08 22.22
65 34.21 32.50 30.95 29.55 28.26 27.08 26.00 25.00 24.07
70 36.84 35.00 33.33 31.82 30.43 29.17 28.00 26.92 25.93
75 39.47 37.50 35.71 34.09 32.61 31.25 30.00 28.85 27.78
80 42.11 40.00 38.10 36.36 34.78 33.33 32.00 30.77 29.63
Price of petrol (gas) in Canada

Temperatures

To convert from Fahrenheit to Celsius, subtract 32 then multiply by 5/9.

To convert from Celsius to Fahrenheit, multiply by 9/5 then add 32.

Degrees F Degrees C
-20 -29
-15 -26
-10 -23
-5 -21
0 -18
5 -15
10 -12
15 -9
20 -7
25 -4
30 -1
32 0
35 2
40 4
45 7
50 10
55 13
60 16
65 18
70 21
75 24
80 27
85 29
90 32
95 35
100 38
105 41
110 43
115 46
120 49
212 100
Home | States/Provinces | Subjects