Why isn't temperature a simple ratio?

Because the scales do not share a zero point. Converting Celsius to Fahrenheit multiplies by 9/5 and then adds 32; Kelvin shifts Celsius by 273.15. This tool applies the real formulas rather than a single factor, so the results are correct.

What's the quick Celsius-to-Fahrenheit rule?

Multiply by 1.8 and add 32. For example 20°C × 1.8 = 36, plus 32 = 68°F. The converter does it exactly, but that mental shortcut is close enough for a quick estimate.

Is anything uploaded?

No. The conversion runs entirely in your browser.

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin. Runs entirely in your browser.

From

33.8

1 Celsius (°C) = 33.8 Fahrenheit (°F)

Processed on your device. This file is never uploaded.

1Enter a temperature and its scale.
2Pick the scale to convert to.
3Read the result, or swap the scales.

The three scales, done right

Temperature is the one everyday conversion that is not a simple multiplication, because Celsius, Fahrenheit and Kelvin do not start from the same zero. This converter uses the correct formula for each direction, so 0°C comes out as exactly 32°F and 273.15 K, not an approximation.

Instant and local

The calculation runs on your device, so it is immediate and works offline once loaded, with nothing uploaded.

Frequently asked questions

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Temperature Converter

The three scales, done right

Instant and local

Frequently asked questions

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