Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit — multiply by 1.8 and add 32. Results update as you type; exact factors shown.
One degree Celsius is 33.8 degrees Fahrenheit — see the exact factor, not a rounded rule of thumb.
How the celsius to fahrenheit converter works
Celsius and Fahrenheit are offset scales, so the conversion is not a simple multiplication: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. Kelvin has the same size of degree as Celsius but starts at absolute zero: K = °C + 273.15. The two scales meet at −40°.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common temperature conversions
| From | To | Units |
|---|---|---|
| -40 °C | -40 °F | degrees Celsius to degrees Fahrenheit |
| -10 °C | 14 °F | degrees Celsius to degrees Fahrenheit |
| 0 °C | 32 °F | degrees Celsius to degrees Fahrenheit |
| 10 °C | 50 °F | degrees Celsius to degrees Fahrenheit |
| 20 °C | 68 °F | degrees Celsius to degrees Fahrenheit |
| 25 °C | 77 °F | degrees Celsius to degrees Fahrenheit |
| 30 °C | 86 °F | degrees Celsius to degrees Fahrenheit |
| 37 °C | 98.6 °F | degrees Celsius to degrees Fahrenheit |
| 40 °C | 104 °F | degrees Celsius to degrees Fahrenheit |
| 60 °C | 140 °F | degrees Celsius to degrees Fahrenheit |
| 90 °C | 194 °F | degrees Celsius to degrees Fahrenheit |
| 100 °C | 212 °F | degrees Celsius to degrees Fahrenheit |
Units in this converter and their exact factors
| Unit | Symbol | To kelvin |
|---|---|---|
| degree Celsius | °C | x+273.15 |
| degree Fahrenheit | °F | (x-32)×5÷9+273.15 |
| kelvin | K | x |
FAQFrequently asked questions about temperature conversion
What is the formula?
°F = °C × 9/5 + 32. The 32 is there because Fahrenheit puts freezing at 32°, not zero.
What is 20°C in Fahrenheit?
68°F — a comfortable room.
What is body temperature in Fahrenheit?
37°C is 98.6°F.
Is there a temperature where both scales agree?
Yes, −40°. It is the only one.
What is the quick estimate?
Double it and add 30: 20°C → 70°F, close to the true 68°F.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.