converters • converter • Statutory 2026 Engine

Temperature Converter (Celsius, Fahrenheit, Kelvin)

Free online temperature converter to transform degrees between Celsius, Fahrenheit, and Kelvin with step-by-step formulas and thermodynamic limits.

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Interactive Temperature Converter (Celsius, Fahrenheit, Kelvin) Engine Active

Worked Example: Converting 68°F to Celsius

A weather forecaster converts a comfortable indoor room reading of 68°F into Celsius.

Initial Temperature68.00 °F
Subtract Offset (32)68 - 32 = 36
Multiply by 5/936 × 5/9 = 20.00
Target Reading20.00 °C

A temperature of 68°F corresponds to exactly 20.0°C (293.15 Kelvin).

Frequently Asked Questions

At what temperature are Celsius and Fahrenheit identical?

Celsius and Fahrenheit are equal at exactly -40 degrees (-40 °C = -40 °F). Solving the equation C = (C × 9/5) + 32 yields C = -40.

Why does the Kelvin scale not use degrees?

Kelvin is an absolute thermodynamic scale, not an arbitrary interval scale. By scientific convention established in 1967, it is written as "Kelvin" (K) rather than "degrees Kelvin" (°K).

What is the absolute zero limit in each unit?

Absolute zero is the theoretical point where all molecular motion ceases. It is exactly 0 K on the Kelvin scale, -273.15 °C in Celsius, and -459.67 °F in Fahrenheit.