Conversion

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin. Enter a value in any field and the others update automatically.

Celsius (°C)

Fahrenheit (°F)

Kelvin (K)

Formulas:
°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
K = °C + 273.15

Temperature Conversion Guide

Temperature can be measured using three main scales: Celsius (used worldwide), Fahrenheit (used primarily in the US), and Kelvin (used in science). Each scale has its own zero point and degree size.

Common Reference Points

Description	Celsius	Fahrenheit	Kelvin
Absolute Zero	−273.15°C	−459.67°F	0 K
Water Freezes	0°C	32°F	273.15 K
Room Temperature	20–22°C	68–72°F	293–295 K
Body Temperature	37°C	98.6°F	310.15 K
Water Boils	100°C	212°F	373.15 K

Quick Mental Math Tricks

C to F (approximate): Double the Celsius and add 30. Example: 20°C → 40 + 30 = 70°F (actual: 68°F)
F to C (approximate): Subtract 30 and halve. Example: 72°F → (72-30)/2 = 21°C (actual: 22.2°C)
−40 is the crossover: −40°C = −40°F (the only temperature where both scales are equal)