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🌡️ Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Visual thermometer, formulas, common references — 100% private.

Visual Comparison
Celsius
0°C
Fahrenheit
32°F
Kelvin
273.15 K
Rankine
491.67°R
Convert Temperature
Value
From
°C
0
Celsius
°F
32
Fahrenheit
K
273.15
Kelvin
°R
491.67
Rankine
Formula Used
°F = (°C × 9/5) + 32
Common Temperatures
Temperature Comparison
Reference°C°FK°R
Conversion Log
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; Celsius · Fahrenheit · Kelvin · Rankine
; ──────────────────────────────────────
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All Formulas
C → F
°F = (°C × 9/5) + 32
F → C
°C = (°F − 32) × 5/9
C → K
K = °C + 273.15
K → C
°C = K − 273.15
F → K
K = (°F + 459.67) × 5/9
C → R
°R = (°C + 273.15) × 9/5
Shortcuts
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Temperature Scales
°C
Celsius — Water freezes at 0°, boils at 100°. Used worldwide.
°F
Fahrenheit — Water freezes at 32°, boils at 212°. Used in the US.
K
Kelvin — Absolute scale. 0 K = absolute zero. Used in science.
°R
Rankine — Absolute scale like Kelvin, but uses Fahrenheit degrees.
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About Temperature Conversion

Celsius vs Fahrenheit

Celsius is used by most countries worldwide. Fahrenheit is primarily used in the United States. The scales cross at -40° — the only temperature that is the same in both.

Absolute Zero

The coldest possible temperature is absolute zero: 0 K, -273.15°C, -459.67°F. At this point, all molecular motion stops. It has never been fully reached in a lab.

Quick Mental Math

Quick C→F estimate: double the Celsius value and add 30. Example: 20°C ≈ (20×2)+30 = 70°F (actual: 68°F). Close enough for everyday use!

Body Temperature

Normal human body temperature is about 37°C (98.6°F). A fever is typically above 38°C (100.4°F). Hypothermia sets in below 35°C (95°F).