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Conversion Formulas (from Celsius)
°F = (°C × 9/5) + 32
K = °C + 273.15
°R = (°C + 273.15) × 9/5
°De = (100 − °C) × 3/2
°N = °C × 33/100
°Ré = °C × 4/5
°Rø = °C × 21/40 + 7.5
K = °C + 273.15
°R = (°C + 273.15) × 9/5
°De = (100 − °C) × 3/2
°N = °C × 33/100
°Ré = °C × 4/5
°Rø = °C × 21/40 + 7.5
Understanding Temperature Scales
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Celsius (°C) is the global scientific and everyday standard, with water freezing at 0°C and boiling at 100°C. Fahrenheit (°F) is used in the United States, with water freezing at 32°F and boiling at 212°F. Kelvin (K) is the SI base unit starting at absolute zero (−273.15°C) — the coldest theoretically possible temperature. Rankine (°R) is like Kelvin but in Fahrenheit degrees, used in some US engineering fields.
Use the Temperature Converter above — enter your values and get instant results. This free online tool calculates celsius to fahrenheit converter without any download or signup required. Results update in real time as you type.
Use the Temperature Converter above — enter your values and get instant results. This free online tool calculates how to convert fahrenheit to celsius without any download or signup required. Results update in real time as you type.
Absolute zero (0 K, −273.15°C, −459.67°F) is the theoretical lowest possible temperature. At absolute zero, all atomic motion stops. It has never been reached in practice, but scientists have gotten within billionths of a degree. The third law of thermodynamics states that absolute zero is unattainable — you can approach but never reach it.
Celsius and Fahrenheit are equal at −40 degrees. At −40°C = −40°F, the two scales intersect. This is because the conversion formula °F = (°C × 9/5) + 32, when solved for equality, gives −40.