Celsius to Fahrenheit: Free Online Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit (°C to °F) instantly as you type — and back again. Exact formula steps, adjustable decimals and a quick lookup chart. 100% free and private.

°C
°F
25 °C = 77 °FTwenty-five degrees Celsius is seventy-seven degrees Fahrenheit

Step-by-step calculation

    Why use Celsius to Fahrenheit?

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    Instant two-way conversion

    Type in either box — °C converts to °F (and °F to °C) on every keystroke.

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    One-click swap

    Flip the direction between Celsius → Fahrenheit and Fahrenheit → Celsius instantly.

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    Precision control

    Round results to 0, 1, 2 or 3 decimal places for weather, cooking or science.

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    Private & offline-ready

    Runs 100% in your browser. No sign-up, no uploads, no tracking of your numbers.

    Celsius to Fahrenheit formula (C to F)

    °F = °C × 9/5 + 32

    How to convert Celsius to Fahrenheit in 2 steps:

    1. Multiply the Celsius temperature by 9/5 (which equals 1.8).
    2. Add 32 to the result. That number is the temperature in Fahrenheit.

    Example: 30°C × 1.8 = 54, then 54 + 32 = 86°F.

    Reverse formula (F to C): °C = (°F − 32) × 5/9. Example: 68°F − 32 = 36, 36 × 5/9 = 20°C.

    Quick mental shortcut: double the Celsius value and add 30 (e.g. 20°C → 40 + 30 ≈ 70°F; exact is 68°F). It is close for everyday weather temperatures.

    Celsius to Fahrenheit conversion chart

    Quick lookup reference for common temperatures. Click any row to load it into the converter.

    Common temperatures

    CelsiusFahrenheitWhat it is

    -40°C to 100°C range

    Celsius (°C)Fahrenheit (°F)

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    Frequently asked questions

    How do you convert Celsius to Fahrenheit?

    Multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. Formula: °F = °C × 9/5 + 32. For example, 25°C × 1.8 + 32 = 77°F.

    What is the C to F formula?

    The C to F formula is °F = (°C × 9/5) + 32. The reverse formula is °C = (°F − 32) × 5/9.

    How many Fahrenheit is 1 degree Celsius?

    1°C equals 33.8°F. A change of 1 Celsius degree equals a change of 1.8 Fahrenheit degrees.

    What temperature is the same in Celsius and Fahrenheit?

    -40 is the same in both scales: -40°C = -40°F.

    What is normal body temperature in Fahrenheit?

    Normal human body temperature is about 37°C, which equals 98.6°F.

    Is Celsius to Fahrenheit free and private?

    Yes. Celsius to Fahrenheit is completely free, needs no sign-up, and runs 100% in your browser, so nothing you type is sent to a server.

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