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Temperature Converter (°F, °C, K)

Instant, affine temperature conversions with physical absolute zero validation.

Quick conversions
Converted result
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Scientific:—
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Conversion formula & standard
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Dedicated Specialized Converters

All-in-One Master Unit ConverterAll 11 physical categories in one universal hub
Length ConverterInches, feet, meters & miles
Area ConverterSquare feet, meters & acres
Weight ConverterPounds, kilograms & ounces
Volume ConverterGallons, liters, cups & ounces
Temperature ConverterFahrenheit, Celsius & Kelvin

Affine Temperature Scales & Thermodynamic Zero

Unlike length or mass, temperature scales do not share a common zero point. Celsius and Fahrenheit are affine scales with different zero baselines and degree intervals: a 1 °C change corresponds to a 1.8 °F (9/5) change. Thermodynamic Kelvin begins at absolute zero (0 K = -273.15 °C = -459.67 °F).

°F = (°C × 9/5) + 32 | °C = (°F - 32) × 5/9 | K = °C + 273.15

Verified Conversion Examples

Weather Forecast: 72 °F to Celsius

Translating a pleasant spring afternoon temperature from Fahrenheit to Celsius.

Calculation:(72 - 32) × 5/9 = 40 × 5/9 = 22.222... °C
Result:22.2 °C

Baking Oven: 180 °C to Fahrenheit

Setting a US oven for a European recipe calling for 180 °C.

Calculation:(180 × 9/5) + 32 = 324 + 32 = 356 °F
Result:356 °F (typically rounded to 350 °F or 375 °F in practice)

Physical Boundary: Absolute Zero in Celsius and Fahrenheit

Verifying the lowest possible physical temperature across thermodynamic scales.

Calculation:0 K - 273.15 = -273.15 °C; (-273.15 × 9/5) + 32 = -459.67 °F
Result:-273.15 °C / -459.67 °F

Precision Limits & Official Standards

Outputs maintain clean decimal precision without false rounding. Temperatures below physical absolute zero are rejected.

  • Negative temperatures above absolute zero are fully valid.
  • Input temperatures below 0 K, -273.15 °C, or -459.67 °F trigger a descriptive physical boundary error.

Reference factors follow international treaties (1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Always confirm specialized engineering or medical tolerances with designated regulatory specifications.