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Temperature Converter

Convert Celsius, Fahrenheit and Kelvin.

Best for: Weather, cooking and ovens, travel between metric and US regions, and science or medicine.

Complete guide

Input

From
To
How it's calculated & sources
The Temperature Converter uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

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

Example

100 °C = 212 °F = 373.15 K.

Frequently asked questions

Is conversion real-time?+

Yes — values update instantly as you type in either field, with full bidirectional input.

Where does the temperature reference come from?+

All factors are SI-anchored using internationally accepted conversions.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Temperature?
A temperature converter changes a reading between Celsius, Fahrenheit and Kelvin — the three scales used in daily life, the US, and science.
Why does Temperature matter?
The same temperature on a different scale. A one-degree change in Celsius equals a 1.8-degree change in Fahrenheit.
How is Temperature calculated?
Temperature scales differ by both a step size and an offset, so you cannot just multiply by a factor. Celsius to Fahrenheit is F = C x 9/5 + 32; Fahrenheit to Celsius is C = (F - 32) x 5/9; and Kelvin is K = C + 273.15. Formula: F = C x 9/5 + 32 | C = (F - 32) x 5/9 | K = C + 273.15.
What are common temperature mistakes?
Forgetting the +32 offset when going to Fahrenheit.
When should you use the Temperature Converter?
Weather, cooking and ovens, travel between metric and US regions, and science or medicine.

What is the Temperature Converter?

A temperature converter changes a reading between Celsius, Fahrenheit and Kelvin — the three scales used in daily life, the US, and science.

How the Temperature Converter works

Temperature scales differ by both a step size and an offset, so you cannot just multiply by a factor. Celsius to Fahrenheit is F = C x 9/5 + 32; Fahrenheit to Celsius is C = (F - 32) x 5/9; and Kelvin is K = C + 273.15.

F = C x 9/5 + 32 | C = (F - 32) x 5/9 | K = C + 273.15

Reference points

Water freezes032273.15
Body temperature3798.6310.15
Water boils100212373.15
Absolute zero-273.15-459.670

Common mistakes to avoid

  • Forgetting the +32 offset when going to Fahrenheit.
  • Confusing a temperature with a temperature difference (the offset only applies to the reading).
  • Writing degrees Kelvin — it is just kelvin, with no degree symbol.

Keywords: temperature, celsius.

Sources: NIST — SI units: temperature

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Temperature Converter free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Temperature Converter?+

Temperature Converter uses the standard temperature formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Temperature Converter runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Temperature Converter on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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