Temperature Conversion Worksheet (with Answers)

Twelve practice questions on converting between Celsius, Fahrenheit and Kelvin, pitched at roughly class 5–8 (ages 10–14). Try each one on paper, then tap Show answer to check your working. The print button prints the questions with blank answer lines.

How to convert temperatures: step by step

Celsius to Fahrenheit

Multiply the Celsius number by 9.
Divide the result by 5. (Steps 1 and 2 together are the same as multiplying by 1.8.)
Add 32. That is your answer in °F.

°F = °C × 9/5 + 32

Fahrenheit to Celsius

Subtract 32 from the Fahrenheit number.
Multiply by 5.
Divide by 9. That is your answer in °C.

°C = (°F − 32) × 5/9

Celsius and Kelvin

Add 273.15 to go from °C to K, and subtract 273.15 to go from K to °C. There is no multiplying, because a kelvin is the same size as a Celsius degree.

Tip for students: check whether your answer is sensible. Fahrenheit numbers are bigger than Celsius numbers for anything warmer than −40. If you convert a hot day in Celsius and get a smaller Fahrenheit number, something has gone wrong.

Temperature conversion worksheet

Name: ____________________ Date: ____________

Convert 20 °C to Fahrenheit.
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68 °F — 20 × 9/5 = 36; 36 + 32 = 68.
Answer: ____________________
Convert 212 °F to Celsius.
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100 °C — 212 − 32 = 180; 180 × 5/9 = 100.
Answer: ____________________
Convert 35 °C to Fahrenheit.
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95 °F — 35 × 9/5 = 63; 63 + 32 = 95.
Answer: ____________________
Convert 50 °F to Celsius.
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10 °C — 50 − 32 = 18; 18 × 5/9 = 10.
Answer: ____________________
Convert 0 °C to Kelvin.
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273.15 K — 0 + 273.15 = 273.15.
Answer: ____________________
Convert 373.15 K to Celsius.
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100 °C — 373.15 − 273.15 = 100.
Answer: ____________________
A cake recipe says 180 °C. What is that in Fahrenheit?
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356 °F — 180 × 9/5 = 324; 324 + 32 = 356.
Answer: ____________________
The temperature in New York is 77 °F. What is it in Celsius?
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25 °C — 77 − 32 = 45; 45 × 5/9 = 25.
Answer: ____________________
Convert −10 °C to Fahrenheit.
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14 °F — −10 × 9/5 = −18; −18 + 32 = 14.
Answer: ____________________
Convert 14 °F to Celsius.
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−10 °C — 14 − 32 = −18; −18 × 5/9 = −10.
Answer: ____________________
Convert 25 °C to Kelvin.
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298.15 K — 25 + 273.15 = 298.15.
Answer: ____________________
A patient's temperature is 102.2 °F. What is it in Celsius?
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39 °C — 102.2 − 32 = 70.2; 70.2 × 5/9 = 39.
Answer: ____________________

Notes for teachers and parents

Questions 1–4 use whole numbers that divide neatly, so learners can focus on the order of operations. Questions 5, 6 and 11 introduce Kelvin, which only needs addition and subtraction. Questions 9 and 10 practise negative numbers and are a nice pair: they show that converting there and back returns the starting value. Questions 7, 8 and 12 put the skill into real situations — baking, travel and health.

A good extension activity is to ask students to find the temperature where Celsius and Fahrenheit give the same number. Setting °F = °C in the formula gives x = 9x/5 + 32, which solves to x = −40. Another is estimating with the “double it and add 30” rule and comparing it with the exact answer, as shown on our Celsius to Fahrenheit converter page.

For checking homework quickly, use the printable conversion chart or the Kelvin converter.

Frequently asked questions

What is the easiest way to convert Celsius to Fahrenheit?

Multiply by 9, divide by 5, then add 32. For a rough answer in your head, double the Celsius number and add 30.

Can I print this worksheet?

Yes. Use the Print worksheet button. The questions print with blank answer lines and the answers stay hidden.

Which class is this worksheet for?

It suits roughly class 5 to class 8 (ages 10–14). Younger learners can use a calculator; older learners should do it by hand.

Why do we add 32 in the formula?

Because water freezes at 32 °F but at 0 °C. Adding 32 lines up the starting points of the two scales.

How do I convert to Kelvin?

Add 273.15 to the Celsius temperature. If you start in Fahrenheit, convert to Celsius first.