Temperature Converter

Multiply by 9/5 then add 32. For example: 100°C × 9/5 + 32 = 212°F. Quick mental trick: double the Celsius, subtract 10%, then add 32.

Subtract 32, then multiply by 5/9. For example: 98.6°F → (98.6 − 32) × 5/9 = 37°C. A quick estimate: subtract 30 and halve the result.

Absolute zero is −273.15°C, which equals 0 Kelvin. It is the coldest theoretically possible temperature — at this point, all molecular motion stops.

Normal body temperature is approximately 98.6°F (37°C). It can vary slightly between individuals, time of day, and measurement method. Fever is generally considered above 100.4°F (38°C).

−40° is the one temperature where Celsius and Fahrenheit are equal: −40°C = −40°F. This is because the two scales converge at that point.

Standard room temperature is 20–22°C (68–72°F). The ISO defines standard temperature as 20°C (68°F). Comfortable indoor temperatures are typically 18–24°C (64–75°F).