Fahrenheit Converter
Convert Fahrenheit to Celsius, Kelvin, Rankine, Delisle, Newton, Réaumur, and Rømer instantly. Free online temperature converter for students and scientists.
About This Calculator
The Fahrenheit Converter is a free online tool that converts any temperature in degrees Fahrenheit (°F) to seven other temperature scales: Celsius (°C), Kelvin (K), Rankine (°R), Delisle (°De), Newton (°N), Réaumur (°Ré), and Rømer (°Rø). Whether you are a student learning temperature conversions, a scientist working with multiple unit systems, a chef following an international recipe, or a traveler checking weather forecasts abroad, this converter provides instant, accurate results for all common and historical temperature scales.
The Fahrenheit scale was developed by German physicist Daniel Gabriel Fahrenheit in 1724. On this scale, the freezing point of water is 32 °F and the boiling point is 212 °F at standard atmospheric pressure, creating a 180-degree interval between the two reference points. While most countries use the Celsius scale for everyday temperature measurement, Fahrenheit remains the standard in the United States and a few Caribbean nations, making conversion tools essential for international communication.
Conversion formulas used:
- Celsius: °C = (°F − 32) × 5/9 — the most widely used scale worldwide
- Kelvin: K = (°F − 32) × 5/9 + 273.15 — the SI base unit for thermodynamic temperature
- Rankine: °R = °F + 459.67 — an absolute scale used in some US engineering fields
- Delisle: °De = (212 − °F) × 5/6 — an obsolete scale invented by Joseph-Nicolas Delisle
- Newton: °N = (°F − 32) × 11/60 — developed by Isaac Newton around 1700
- Réaumur: °Ré = (°F − 32) × 4/9 — historically used in parts of Europe
- Rømer: °Rø = (°F − 32) × 7/24 + 7.5 — proposed by Ole Christensen Rømer in 1701
Temperature conversion is a fundamental skill in science, engineering, cooking, weather reporting, and international travel. Understanding how different scales relate helps avoid errors in laboratory experiments, baking temperatures, industrial processes, and climate data analysis. This converter is designed for students, teachers, engineers, meteorologists, chefs, and anyone who needs quick, reliable temperature conversions.
Regional Notes
India: India uses the Celsius scale officially for weather, cooking, and all scientific work. The Fahrenheit scale is rarely used, but travelers to the US may encounter it. This converter helps Indian users understand US weather reports and international recipes.
United States: The US is one of the few countries that uses Fahrenheit for everyday temperature measurement, including weather forecasts, cooking ovens, and medical thermometers. However, scientific work in the US uses Celsius and Kelvin. This converter is essential for US students and professionals working across scales.
United Kingdom: The UK uses Celsius for most official temperature reporting, though older generations may still reference Fahrenheit. Weather forecasts are in Celsius, but some cookbooks and industrial processes may use Fahrenheit. This converter helps UK users interpret legacy Fahrenheit references.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit value and multiply by 5/9. For example, 212 °F becomes (212 − 32) × 5/9 = 100 °C.
How do I convert Fahrenheit to Kelvin?
To convert Fahrenheit to Kelvin, subtract 32, multiply by 5/9, then add 273.15. The formula is K = (°F − 32) × 5/9 + 273.15.
What is the freezing point of water in Fahrenheit?
The freezing point of water is 32 °F (0 °C, 273.15 K). This is the standard reference point on the Fahrenheit scale, established by Daniel Gabriel Fahrenheit in 1724.
What is the boiling point of water in Fahrenheit?
The boiling point of water at standard atmospheric pressure is 212 °F (100 °C, 373.15 K). The Fahrenheit scale separates freezing and boiling by exactly 180 degrees.
Is there a temperature where Celsius and Fahrenheit are equal?
Yes, at −40 degrees, both Celsius and Fahrenheit scales read the same value. This is the only point where the two temperature scales converge, often used as a quick reference in weather and scientific contexts.
What temperature scales does the Fahrenheit converter support?
Our Fahrenheit converter supports seven temperature scales: Celsius (°C), Kelvin (K), Rankine (°R), Delisle (°De), Newton (°N), Réaumur (°Ré), and Rømer (°Rø). Enter any Fahrenheit value to see instant conversions across all scales.
Is the Fahrenheit converter free to use?
Yes, all calculators on Calculy including the Fahrenheit converter are completely free to use with no registration required. You can bookmark and share conversion links with anyone.
What is the Rankine scale and how does it relate to Fahrenheit?
The Rankine scale is an absolute temperature scale based on Fahrenheit degrees, where 0 °R is absolute zero (−459.67 °F). To convert Fahrenheit to Rankine, simply add 459.67. Rankine is primarily used in some US engineering fields.