# Fahrenheit to Celsius Converter URL: https://speedycalculator.com/calculators/conversion/fahrenheit-to-celsius/ Last updated: 2026-10-25 > Convert degrees Fahrenheit to degrees Celsius instantly. Subtract 32 from the Fahrenheit value, then multiply by 5/9. ## Inputs - Degrees Fahrenheit (°F) ## Results - Degrees Celsius ## Formula ``` °C = (°F − 32) × 5/9 ``` ## Explanation Subtract 32 from the Fahrenheit value, then multiply by 5/9. Oven settings, U.S. weather and fever thermometers are the usual reasons to convert. ### How to use the Fahrenheit to Celsius Converter - Type the number of degrees Fahrenheit into the **Degrees Fahrenheit** field. Decimals such as 50 are fine. - Read the answer in **Degrees Celsius** – it updates as you type, with no button to press. - To convert the other way, type into **Degrees Celsius** and the degrees Fahrenheit are recalculated. - Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion. This page converts only °F ⇄ °C. Need a different unit? Use the general temperature converter, where you can choose any “from” and “to” unit. ### How it works Degrees Fahrenheit and degrees Celsius use different zero points as well as different sized degrees, so this is not a simple multiplication: the calculator applies the formula °C = (°F − 32) × 5/9, which first scales the value and then shifts it by the offset between the two zero points. Going back uses the inverse, °F = (°C − -17.777778) ÷ 0.55555556. Results are calculated at full precision and rounded only for display, so typing into either field gives consistent values. ### How to convert degrees Fahrenheit to degrees Celsius - Start with the value in degrees Fahrenheit: **100 °F**. - Apply the formula °C = (°F − 32) × 5/9. - The result is **37.777778 °C**. - To go back, use °F = (°C − -17.777778) ÷ 0.55555556. ### °F to °C conversion table Degrees FahrenheitDegrees CelsiusDegrees CelsiusDegrees Fahrenheit-40 °F-40 °C-40 °C-40 °F20 °F-6.6666667 °C0 °C32 °F40 °F4.4444444 °C20 °C68 °F68 °F20 °C37 °C98.6 °F72 °F22.222222 °C100 °C212 °F80 °F26.666667 °C180 °C356 °F98.6 °F37 °C200 °C392 °F104 °F40 °C300 °F148.88889 °C375 °F190.55556 °C425 °F218.33333 °C500 °F260 °C ### What is a degree Fahrenheit? The Fahrenheit scale, proposed by Daniel Fahrenheit in 1724, puts water’s freezing point at 32 °F and boiling point at 212 °F. It is the everyday scale in the United States. ### What is a degree Celsius? The Celsius scale sets 0 °C at the freezing point and 100 °C at the boiling point of water at sea level. Since 2019 it is defined from the kelvin: °C = K − 273.15. ### Common mistakes to avoid Forgetting the offset (°f is not just °c × 1.8), converting temperature differences with the full formula (a change of 10 °c is a change of 18 °f, with no +32), and writing “degrees kelvin”. ## Worked example Inputs — Degrees Fahrenheit: 100 °F. Results — **Degrees Celsius = 37.77777778 °C**. ## FAQ **What is 350 °F in Celsius?** About 177 °C, a common oven setting. **What is 100 °F in Celsius?** About 37.8 °C. **How do I convert degrees Fahrenheit to degrees Celsius?** Use °C = (°F − 32) × 5/9. For example, 100 °F = 37.777778 °C. **How do I convert degrees Celsius back to degrees Fahrenheit?** Use °F = (°C − -17.777778) ÷ 0.55555556, or type the value into the degrees Celsius field above. **What is 50 °F in degrees Celsius?** 50 °F = 10 °C. **What is 20 °F in degrees Celsius?** 20 °F = -6.6666667 °C. **Is this conversion exact?** Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit. **Can I convert to other units on this page?** This page converts only between degrees Fahrenheit and degrees Celsius. To pick any temperature unit, use the general temperature converter linked under Related calculators. **What formula does the Fahrenheit to Celsius Converter use?** °C = (°F − 32) × 5/9. ## Sources - [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811) - [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)