Convert Celsius to Fahrenheit

Fahrenheit and Celsius are the two primary temperature scales used worldwide to measure atmospheric weather forecasts, body fever levels, oven baking temperatures, HVAC thermostat settings, and scientific experiments. While the Fahrenheit (°F) scale is the official customary temperature scale used in the United States, its territories, the Bahamas, Belize, and the Cayman Islands, the Celsius (°C) scale is the official SI metric standard used across Europe, Asia, Latin America, Canada, Australia, and the global scientific community.

Our free online Fahrenheit to Celsius Converter provides instant, high-precision temperature conversions in both directions:

• Fahrenheit to Celsius: Subtract 32 from °F, then multiply by 5 / 9 (or divide by 1.8).
• Celsius to Fahrenheit: Multiply °C by 1.8 (or 9 / 5), then add 32.

Exact Temperature Conversion Formulas

On the Fahrenheit scale, water freezes at 32 °F and boils at 212 °F, creating a 180-degree interval. On the Celsius scale, water freezes at 0 °C and boils at 100 °C, creating a 100-degree interval. The ratio between these two scales is 180 / 100 = 1.8 (or 9 / 5):

Step-by-Step Calculation Example

To convert 50 °F to Celsius:

(50 - 32) × (5 / 9) = 18 × 0.55555556 = 10 °C

Thus, 50 °F is equal to exactly 10 °C.

Fun Fact: -40 °F and -40 °C represent the exact parity crossover point where both scales are numerically identical ((-40 - 32) × 5/9 = -72 × 5/9 = -40 °C).

Fahrenheit to Celsius Conversion Table

Below is a quick reference lookup table converting key temperatures from -40 °F up to 1,000 °F:

History & Physics: Daniel Fahrenheit vs. Anders Celsius

Daniel Gabriel Fahrenheit (1724)

German physicist Daniel Gabriel Fahrenheit invented the precision mercury-in-glass thermometer in 1714. In 1724, he established his temperature scale using three reference points: 0 °F (the freezing temperature of a salt-ice brine mixture), 32 °F (the freezing point of pure water), and 96 °F (originally measured as human body temperature under his armpit). Later adjustments separated freezing (32 °F) and boiling (212 °F) by exactly 180 degrees, refining normal human body temperature to 98.6 °F.

Anders Celsius and Carl Linnaeus (1742–1745)

Swedish astronomer Anders Celsius proposed a centigrade scale in 1742. Interestingly, Celsius’s original scale was inverted: 0 °C represented the boiling point of water, while 100 °C represented the freezing point of water! Following Celsius’s death in 1744, botanist Carl Linnaeus reversed the scale in 1745 to its modern orientation (0 °C freezing, 100 °C boiling). In 1948, the international Conference on Weights and Measures officially renamed “centigrade” to Celsius in honor of Anders Celsius.

To convert Celsius back to Fahrenheit, visit our Celsius to Fahrenheit Converter. For scientific absolute zero scale conversions, check our Celsius to Kelvin Converter. For humidity and apparent temperature, explore our Heat Index Calculator or Conversion Calculator.

Frequently Asked Questions (FAQ)

How do I convert Fahrenheit to Celsius easily in my head?

Subtract 30 from the Fahrenheit temperature, then divide by 2. For example, for 70 °F: 70 - 30 = 40 ÷ 2 = 20 °C (exact calculation is 21.1 °C).

What is 350 °F in Celsius for baking recipes?

350 °F converts to (350 - 32) × 5/9 = 176.67 °C. European recipes round this to 180 °C (or 160 °C for fan-assisted/convection ovens).

What is a 98.6 °F human body temperature in Celsius?

98.6 °F equals exactly 37.0 °C.

At what temperature are Fahrenheit and Celsius equal?

Fahrenheit and Celsius are equal at -40 degrees (-40 °F = -40 °C).