Temperature Converter 2025

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Convert Temperature

Celsius (°C)

Fahrenheit (°F)

Kelvin (K)

Temperature Info

Current Temperature

25.0°C

77.0°F

298.15 K

Conversion Formulas

°C → °F: (°C × 9/5) + 32

°F → °C: (°F - 32) × 5/9

°C → K: °C + 273.15

K → °C: K - 273.15

Quick Temperatures

Temperature Scale Comparison

Reference Point	Celsius (°C)	Fahrenheit (°F)	Kelvin (K)
Absolute Zero	-273.15°C	-459.67°F	0.00 K
Same in °C & °F	-40.00°C	-40.00°F	233.15 K
Water Freezes	0.00°C	32.00°F	273.15 K
Room Temp	20.00°C	68.00°F	293.15 K
Body Temp	37.00°C	98.60°F	310.15 K
Water Boils	100.00°C	212.00°F	373.15 K

What is Temperature Conversion?

Temperature conversion transforms temperature measurements between Celsius (°C), Fahrenheit (°F), and Kelvin (K) scales. Essential for weather, cooking, science, and international travel.

Our converter provides real-time conversion across all 3 scales, temperature context (freezing, hot, etc.), body temperature guide for fever detection, and conversion formulas. Perfect for weather forecasts, recipes, and scientific calculations.

How to Use

1Enter temperature in any scale (°C, °F, or K)
2All other scales update automatically in real-time
3See temperature context (freezing, warm, hot, etc.)
4Use quick presets for common temperatures
5Check body temperature status if applicable

Temperature Conversion Formulas

Celsius ⇄ Fahrenheit

°C to °F:

°F = (°C × 9/5) + 32

Example: 25°C = (25 × 1.8) + 32 = 77°F

°F to °C:

°C = (°F - 32) × 5/9

Example: 77°F = (77 - 32) × 0.556 = 25°C

Celsius ⇄ Kelvin

°C to K:

K = °C + 273.15

Example: 25°C = 25 + 273.15 = 298.15 K

K to °C:

°C = K - 273.15

Example: 298.15 K = 298.15 - 273.15 = 25°C

Common Temperature Conversions

Description	Celsius (°C)	Fahrenheit (°F)	Kelvin (K)
Absolute Zero	-273.15°C	-459.67°F	0 K
Water Freezes	0°C	32°F	273.15 K
Cold Day	10°C	50°F	283.15 K
Room Temperature	20°C	68°F	293.15 K
Warm Day	25°C	77°F	298.15 K
Hot Day	30°C	86°F	303.15 K
Body Temperature	37°C	98.6°F	310.15 K
Very Hot Day	40°C	104°F	313.15 K
Water Boils	100°C	212°F	373.15 K

Body Temperature Guide

Normal body temperature is 36.1-37.2°C (97-99°F). Use this guide to check fever status:

❄️ Below Normal

Below 35°C (95°F): Hypothermia - Seek medical help

35-36°C (95-96.8°F): Below normal - Monitor closely

✅ Normal Range

36.1-37.2°C (97-99°F): Normal body temperature

Varies by: Time of day, activity, age

🔥 Fever Range

37.3-38°C (99-100.4°F): Low fever

38-39°C (100.4-102.2°F): Moderate fever

39-40°C (102.2-104°F): High fever

Above 40°C (104°F): Very high - Medical emergency

Temperature Scales Explained

🌡️ Celsius (°C)

Created by: Anders Celsius (1742)
Used in: Most of the world
Freezing point: 0°C (water)
Boiling point: 100°C (water)
Scale: 100 degrees between freeze/boil
Also called: Centigrade

🌡️ Fahrenheit (°F)

Created by: Daniel Fahrenheit (1724)
Used in: USA, some Caribbean countries
Freezing point: 32°F (water)
Boiling point: 212°F (water)
Scale: 180 degrees between freeze/boil
Human body: Originally 96°F (now 98.6°F)

🌡️ Kelvin (K)

Created by: Lord Kelvin (1848)
Used in: Science & engineering
Absolute zero: 0 K (coldest possible)
Water freezes: 273.15 K
Water boils: 373.15 K
No negative: Starts from absolute zero

Frequently Asked Questions

1. What is 0°C in Fahrenheit?

0°C = 32°F. This is the freezing point of water at sea level.

Calculation:

Formula: °F = (°C × 9/5) + 32

°F = (0 × 1.8) + 32 = 0 + 32 = 32°F

2. What temperature are Celsius and Fahrenheit equal?

-40°C = -40°F. This is the only temperature where both scales show the same number.

Why -40?

Solving the equation: °F = (°C × 9/5) + 32 when °C = °F, we get -40 as the intersection point.

3. Why does the US use Fahrenheit instead of Celsius?

The US adopted Fahrenheit before the metric system became standard. While most countries switched to Celsius in the 1960s-70s, the US retained Fahrenheit for everyday use.

Countries Using Each Scale:

Celsius: 195+ countries (most of the world)

Fahrenheit: USA, Liberia, Myanmar, Palau, Bahamas, Cayman Islands

Kelvin: Scientific & engineering applications worldwide