Temperature Converter: How to Convert Between Celsius, Fahrenheit, and Kelvin Like a Pro

Whether you are baking cookies from an American recipe at 350°F (your oven uses Celsius), checking whether 30°C requires a jacket (86°F — definitely beach weather), or running a science experiment that needs Kelvin, knowing how to convert between temperature scales is essential. The good news: with a few reference points and our free converter, you will never guess a temperature conversion again.

Use our Temperature Converter for instant, accurate conversions between all three scales.

The Three Temperature Scales at a Glance

Scale	Used Where	Key Reference Point
Fahrenheit (°F)	United States, Bahamas, Cayman Islands	Water freezes at 32°F, boils at 212°F
Celsius (°C)	Most of the world	Water freezes at 0°C, boils at 100°C
Kelvin (K)	Science and engineering globally	0 K = absolute zero (-273.15°C)

Quick Mental Math Cheat Sheet

No converter handy? These shortcuts will get you within 1-2 degrees for everyday temperatures:

• Fahrenheit to Celsius (rough): Subtract 30, divide by 2.
  Example: 86°F → (86-30)/2 = 28°C (exact: 30°C — close enough for weather)
• Celsius to Fahrenheit (rough): Multiply by 2, add 30.
  Example: 20°C → (20×2)+30 = 70°F (exact: 68°F)
• Exact formulas: °C = (°F − 32) × 5/9. °F = (°C × 9/5) + 32. K = °C + 273.15.

For exact results every time, use the Temperature Converter.

Real-World Conversion Examples

Situation	Fahrenheit	Celsius	What It Feels Like
Freezing outdoor temp	32°F	0°C	Ice on roads, wear a coat
Pleasant spring day	68°F	20°C	Light jacket, comfortable
Hot summer afternoon	86°F	30°C	Shorts and t-shirt weather
Heat wave	100°F	38°C	Stay hydrated, avoid midday sun
Normal body temp	98.6°F	37°C	Healthy human temperature
Baking: moderate oven	350°F	177°C	Cookies and cakes
Baking: hot oven	400°F	204°C	Roasted vegetables, bread
Baking: very hot	450°F	232°C	Pizza, searing meat

Common Conversion Mistakes and How to Avoid Them

Mistake	Why It Happens	How to Avoid
Dividing by 5/9 instead of multiplying	Forgetting which operation goes with which direction	Remember: °C = (°F-32) × 5/9 (multiply). °F = (°C × 9/5) + 32 (also multiply then add)
Forgetting the −32 step	Jumping straight to the ratio	Always subtract 32 from F first, then apply the ratio
Confusing Kelvin with Celsius degrees	Kelvin has no degree symbol	Write “300 K” not “300°K”. Add 273.15 to °C to get K
Using the rough shortcut for baking	The mental math shortcut is only accurate to ±2°	Use the exact formula or the Temperature Converter for cooking

Why Kelvin Matters (Even in Daily Life)

Kelvin is the SI unit for temperature and is used in physics, chemistry, and engineering because it starts at absolute zero — the point where atoms stop moving. This makes it ideal for calculations involving gas laws, thermodynamic equations, and color temperature (light bulbs: 2700 K = warm white, 5000 K = daylight).

To convert any temperature to Kelvin instantly, use the Temperature Converter. Enter any value in °F, °C, or K and get all three results at once.