Temperature Converter – Fahrenheit, Celsius & Kelvin

Convert between Fahrenheit, Celsius, and Kelvin instantly. Free temperature converter with conversion formulas and reference points.

Last updated: 2026-03-09

Temperature converter

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Temperature Conversion Formulas

The three main temperature scales are Fahrenheit (used in the US), Celsius (used worldwide), and Kelvin (used in science).

°C = (°F − 32) × 5/9

°F = °C × 9/5 + 32

K = °C + 273.15

Key reference points: Water freezes at 0°C / 32°F / 273.15 K and boils at 100°C / 212°F / 373.15 K. Absolute zero (0 K / −273.15°C / −459.67°F) is the lowest possible temperature.

Temperature conversion FAQs

Answers to common questions about temperature units.

What is the easiest way to convert F to C?

Subtract 32, then multiply by 5/9. For a quick mental estimate: subtract 30 and divide by 2. Example: 72°F → (72-30)/2 = 21°C (actual: 22.2°C).

Why does the US use Fahrenheit?

The Fahrenheit scale was developed by Daniel Fahrenheit in 1724 and was widely adopted in English-speaking countries. Most countries switched to Celsius as part of metric adoption, but the US retained Fahrenheit for everyday use.

When is Kelvin used?

Kelvin is the SI unit for temperature and is used in scientific research, physics, and engineering. It starts at absolute zero (the coldest possible temperature) and uses the same increment size as Celsius.

What temperature is the same in both F and C?

-40 degrees is the same in both Fahrenheit and Celsius. This is the only point where the two scales intersect.

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Disclaimer

Conversions use standard formulas. Results are rounded for display and may differ from exact values in specialized applications.

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