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Temperature Converter

Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K).

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Value

From

To

Result

— °F

Quick Conversion Table

Based on current input

Unit	Value

Temperature Conversion Guide

Core Formulas

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

Tip: Kelvin starts at absolute zero (no negative K). Celsius and Fahrenheit can be negative.

Quick Examples

0 °C → °F: (0 × 9/5) + 32 = 32 °F
100 °C → °F: (100 × 9/5) + 32 = 212 °F
25 °C → K: 25 + 273.15 = 298.15 K
68 °F → °C: (68 − 32) × 5/9 = 20 °C
300 K → °C: 300 − 273.15 = 26.85 °C

Mental math: °F ≈ °C × 2 + 30 (rough rule) — good for quick estimates.

When to use which scale

Celsius (°C): everyday weather & most countries (metric).
Fahrenheit (°F): everyday weather in the United States.
Kelvin (K): science & engineering (absolute scale, no degrees symbol).

Temperature – Full History