Temperature Converter

Chuyển đổi nhiệt độ C / F / K

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Temperature Converter — Celsius, Fahrenheit and Kelvin

This free temperature converter lets you instantly switch between Celsius, Fahrenheit, and Kelvin — the three most widely used temperature scales in science, cooking, and everyday life. Simply type a value and all conversions appear in real time, no installation or account needed. Whether you are following a recipe, solving a physics problem, or reading an international weather forecast, this tool gives you accurate results in seconds.

Benefits

Using a dedicated temperature converter saves time and eliminates manual calculation errors:

Instant results: Conversions update as you type, using standard mathematical formulas with full decimal precision.
All three scales at once: Enter one value and see the equivalent in both remaining scales simultaneously.
Works in any browser: No download, no plugin, no account — open the page and start converting.
Always free: Unlimited use with no ads blocking your results.

Use cases

The temperature converter is useful across a wide range of everyday and professional situations:

Cooking and baking: Convert oven temperatures from Fahrenheit (US recipes) to Celsius for ovens calibrated in metric units.
Science and education: Physics and chemistry students regularly need to convert between Kelvin and Celsius when working with thermodynamic equations.
Weather and travel: Quickly understand local weather forecasts when visiting countries that use Fahrenheit, such as the United States.
Medicine and healthcare: Convert body temperature or medication storage requirements between clinical standards.
Engineering and manufacturing: Translate temperature specifications in multilingual technical documentation without manual lookup.

How to use

Getting your converted temperature takes only a few seconds:

Select your input scale — Celsius, Fahrenheit, or Kelvin.
Type the temperature value you want to convert.
The equivalent values in the other two scales appear instantly below.
Use the copy button to transfer any result directly to your clipboard.

Frequently asked questions

What is the formula to convert Celsius to Fahrenheit? The standard formula is °F = (°C × 9/5) + 32; to reverse it, use °C = (°F − 32) × 5/9.

Why does Kelvin not use a degree symbol? Kelvin is the SI base unit for thermodynamic temperature and represents an absolute scale, so by international convention it is written as K rather than °K.

At what temperature are Celsius and Fahrenheit equal? Celsius and Fahrenheit intersect at exactly −40 — that is, −40 °C equals −40 °F, which is a useful reference point to remember.

Can I enter decimal or negative values? Yes, the converter fully supports decimal numbers and negative values, so inputs like −17.8 °C or 98.6 °F are handled accurately.