Temperature Conversion Made Easy

1/1/2024

4 min read

Temperature scales use different zero points and step sizes, so they are **not** proportional like meters and feet. Treat conversions as affine transforms: multiply then add (or the inverse).

Explanation

Celsius and Fahrenheit relate through a linear map with offset 32°F at freezing and a 9/5 slope between boiling and freezing spans. Kelvin shares Celsius-sized degrees but anchors at absolute zero. Because of the offset, **doubling** a Fahrenheit number has no physical meaning—always convert to a thermodynamic-friendly unit before reasoning about ratios.

Formula

°F = °C × 9/5 + 32; °C = (°F − 32) × 5/9; K = °C + 273.15.

Example

Human body temperature near 37°C maps to 98.6°F via the affine formula—not by multiplying by a single conversion factor like length units.

How to use the related calculator

Use the Temperature calculator: enter a value, choose the unit you are converting from and to, then read the equivalent. When comparing weather forecasts, stick to one scale per comparison so offsets do not confuse large versus small changes.

Try the related calculator

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FAQ

Can I use dimensional analysis like meters to inches?

Not with a lone multiply-only factor across Celsius and Fahrenheit because of the additive offset. Kelvin-to-Celsius only needs addition once you respect absolute zero.

Which scale should scientists standardize on?

Kelvin for thermodynamics and chemistry ratios; Celsius for everyday weather deltas once contextualized.