Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin. Pick a unit on the left and one on the right, enter a value, and copy the result.
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Select the From unit in the left table and the To unit in the right table, enter a value, and see the result. You can set decimal places from 0 to 10 and copy the result or copy with labels.
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Examples
- 0°C → 32°F
- 100°C → 212°F
- 32°F → 0°C
- 0°C → 273.15 K
FAQ
What is the formula for Celsius to Fahrenheit?
F = (C × 9/5) + 32.
What is the formula for Fahrenheit to Celsius?
C = (F − 32) × 5/9.
What about Kelvin?
K = C + 273.15. You can convert between Celsius, Fahrenheit, and Kelvin on this page by choosing the units in the two tables.
Why is −40 the same in both scales?
−40°C = −40°F is the only point where the two scales meet, because the two linear scales converge at that value.
What is a normal human body temperature?
Normal body temperature is 37°C (98.6°F). A fever is generally considered 38°C (100.4°F) or above. Temperature can vary slightly throughout the day.
What is absolute zero?
Absolute zero is 0 K = −273.15°C = −459.67°F. It is the theoretical temperature at which all molecular motion stops. Nothing can be colder than absolute zero.
What are common cooking temperatures in Celsius and Fahrenheit?
Water boils at 100°C / 212°F. A moderate oven is 180°C / 356°F. Deep frying oil is typically 175–190°C / 347–374°F. A bread crust browns at around 200°C / 390°F.
What is the Rankine scale?
Rankine (°R) is an absolute temperature scale like Kelvin, but based on Fahrenheit degrees. 0°R = absolute zero. 0°F = 459.67°R. It is rarely used outside thermodynamics and some US engineering contexts.
What are typical weather temperatures in Celsius vs Fahrenheit?
0°C / 32°F = freezing. 20°C / 68°F = comfortable room temperature. 30°C / 86°F = hot summer day. 37°C / 99°F = very hot / heat wave. −10°C / 14°F = cold winter day.
How do I quickly estimate Celsius from Fahrenheit without a calculator?
Subtract 30 and divide by 2. Example: 70°F → (70−30)/2 = 20°C. The exact answer is 21.1°C, so this is a close approximation for everyday use.
What temperature does water freeze and boil at high altitude?
At high altitude, lower air pressure reduces the boiling point of water. At 2000 m elevation it boils at about 93°C / 199°F. Freezing point stays very close to 0°C / 32°F regardless of altitude.
What is a comfortable room temperature in Celsius and Fahrenheit?
Most people are comfortable at 20–22°C (68–72°F). The WHO recommends a minimum indoor temperature of 18°C (64°F) for health. Sleeping is often more comfortable at 16–19°C (61–66°F).