Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Réaumur and Rankine with accurate offset formulas (not simple multipliers). Useful for weather, cooking, science and international travel.
Temperature conversion
Temperature Convert
All units overview
All Units Overview
Temperature Converter Guide
Celsius / Fahrenheit / Kelvin / Réaumur / Rankine
The temperature converter supports precise conversion among five scales: Celsius (°C), Fahrenheit (°F), Kelvin (K), Réaumur (°Ré) and Rankine (°R). Unlike linear units such as length or weight, temperature involves absolute zero offsets, so there is no constant multiplier between scales — linear formulas with additions/subtractions must be used. The tool uses Kelvin as the internal base scale to ensure accuracy across all conversions, suitable for weather forecasting, cooking and baking, scientific experiments, industrial measurement and international travel.
Temperature converter guide
Temperature is one of the few quantities that cannot be converted with a simple multiplier, because different scales have different zero points. This tool supports Celsius, Fahrenheit, Kelvin, Réaumur and Rankine, using Kelvin as the internal base for accuracy.
Celsius and Fahrenheit
Celsius (°C) freezes water at 0° and boils at 100°, used worldwide; Fahrenheit (°F) freezes at 32° and boils at 212°, mainly used in the US. °F = °C × 9/5 + 32.
Kelvin: the thermodynamic scale
Kelvin (K) has 0 K at absolute zero (−273.15°C); K = °C + 273.15, the SI base unit for science and engineering.
Réaumur and Rankine
Réaumur freezes at 0° and boils at 80° (°Ré = °C × 4/5); Rankine is the absolute Fahrenheit scale (°R = °F + 459.67 = K × 9/5).
FAQ
QWhy can’t temperature use a simple multiplier?
Because Celsius and Fahrenheit have different zero points (0°C = 32°F); a formula with an offset like °F = °C × 9/5 + 32 is required.
QWhat is normal body temperature?
About 37°C = 98.6°F = 310.15 K.
QWhat is absolute zero?
0 K = −273.15°C = −459.67°F, the theoretical minimum temperature.
QWhat is 180°C in Fahrenheit?
180°C × 9/5 + 32 = 356°F, often rounded to 350°F in recipes.
QCan Kelvin be negative?
No. Kelvin starts at absolute zero, so negative Kelvin temperatures do not exist.