How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by 9/5 and add 32. For example, 100 °C becomes 100 x 1.8 + 32 = 212 °F. The temperature converter also shows the Kelvin and Rankine equivalents in the same step.

What is the formula for Fahrenheit to Celsius?

Subtract 32, then multiply by 5/9: (°F - 32) x 5/9. So 212 °F becomes 180 x 5/9 = 100 °C. The 32 offset is essential — forgetting it produces errors of 64 degrees.

Why do I need Kelvin for temperature conversion?

Kelvin is the absolute scale, starting at -273.15 °C. The tool uses it as a neutral middle step, which guarantees Celsius, Fahrenheit and Rankine conversions agree perfectly in both directions.

What is Rankine and when is it used?

Rankine is the absolute version of Fahrenheit, with 0 °R at absolute zero and the same step size as Fahrenheit. It appears in some American aerospace and thermodynamics textbooks.

What is absolute zero?

Absolute zero is 0 K, the coldest possible temperature where molecular motion is minimal. It equals -273.15 °C, -459.67 °F and 0 °R.

How many degrees difference is there between Celsius and Fahrenheit?

One Celsius degree equals 1.8 Fahrenheit degrees, because the two scales use different step sizes. That is why a temperature difference of 10 °C is a difference of 18 °F, with no offset involved.

Is the temperature converter accurate?

Yes. It uses the exact conversion constants 273.15 and the precise 9/5 and 5/9 ratios, matching the SI definitions, and rounds only in the final display.

Can it convert temperature differences?

It converts absolute temperatures. For a difference, use only the ratio (9/5 or 5/9) without the 32 offset — a 9 °F rise is exactly a 5 °C rise.

Is my data stored when I use this tool?

No. The conversion runs entirely in your browser. Your temperature values are never uploaded, stored or logged.

How many degrees Fahrenheit is one degree Celsius?

One Celsius degree equals 1.8 Fahrenheit degrees. So a change of 10 °C is a change of 18 °F, though absolute temperatures also need the offset of 32 °F applied.

When should I use Kelvin instead of Celsius?

Use Kelvin in physics, chemistry and engineering formulas, because it starts at absolute zero and doubles thermal energy correctly. Convert with K = °C + 273.15 whenever a calculation needs an absolute temperature.

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Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly. Free temperature converter for weather and science.

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