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The U.S. and metric systems use different scales to measure temperature. The U.S. system uses degrees Fahrenheit, written The metric system uses degrees Celsius, written [link] shows the relationship between the two systems.
If we know the temperature in one system, we can use a formula to convert it to the other system.
To convert from Fahrenheit temperature, to Celsius temperature, use the formula
To convert from Celsius temperature, to Fahrenheit temperature, use the formula
Convert into degrees Celsius.
We will substitute
into the formula to find
| Use the formula for converting °F to °C | |
 |
 |
| Simplify in parentheses. | |
| Multiply. | |
| A temperature of 50°F is equivalent to 10°C. |
Convert the Fahrenheit temperatures to degrees Celsius:
15°C
The weather forecast for Paris predicts a high of Convert the temperature into degrees Fahrenheit.
We will substitute
into the formula to find
| Use the formula for converting °F to °C | |
 |
 |
| Multiply. | |
| Add. | |
| So 20°C is equivalent to 68°F. |
Convert the Celsius temperatures to degrees Fahrenheit:
The temperature in Helsinki, Finland was
59°F
Convert the Celsius temperatures to degrees Fahrenheit:
The temperature in Sydney, Australia was
50°F
Make Unit Conversions in the U.S. System
In the following exercises, convert the units.
A park bench is feet long. Convert the length to inches.
A floor tile is feet wide. Convert the width to inches.
24 inches
A ribbon is inches long. Convert the length to feet.
Carson is inches tall. Convert his height to feet.
3.75 feet
Jon is feet inches tall. Convert his height to inches.
Faye is feet inches tall. Convert her height to inches.
58 inches
A football field is feet wide. Convert the width to yards.
On a baseball diamond, the distance from home plate to first base is yards. Convert the distance to feet.
90 feet
Ulises lives miles from school. Convert the distance to feet.
Denver, Colorado, is feet above sea level. Convert the height to miles.
0.98 miles
A killer whale weighs tons. Convert the weight to pounds.
Blue whales can weigh as much as tons. Convert the weight to pounds.
300,000 pounds
An empty bus weighs pounds. Convert the weight to tons.
At take-off, an airplane weighs pounds. Convert the weight to tons.
110 tons
The voyage of the Mayflower took months and days. Convert the time to days.
Lynn’s cruise lasted days and hours. Convert the time to hours.
162 hours
Rocco waited hours for his appointment. Convert the time to seconds.
Misty’s surgery lasted hours. Convert the time to seconds.
8100 seconds
How many teaspoons are in a pint?
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