Temperature Converter

Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) temperature scales instantly. Includes common temperature references and conversion formulas.

Temperature Conversion

Temperature Value 25°C
Enter the temperature value and select the input unit
Convert To Multiple Units
Select which temperature scales to convert to
Common Temperatures Quick Select
Quickly select common temperature references
Decimal Precision 2 decimals
0 2 4 6
Set decimal places for conversion results (0-6)
Temperature Range -50°C to 150°C
-50°C 25°C 100°C 150°C
Adjust temperature using slider (-50°C to 150°C)

Temperature Conversion Results

Conversion Formulas

Temperature Comparison

Common Temperature References

Description Celsius (°C) Fahrenheit (°F) Kelvin (K)
Absolute Zero -273.15°C -459.67°F 0 K
Dry Ice (Sublimation) -78.5°C -109.3°F 194.65 K
Freezing Point of Water 0°C 32°F 273.15 K
Room Temperature 20-25°C 68-77°F 293.15-298.15 K
Average Human Body 37°C 98.6°F 310.15 K
Boiling Point of Water 100°C 212°F 373.15 K
Pizza Oven 260°C 500°F 533.15 K

Interesting Fact

-40°C is exactly equal to -40°F. This is the only temperature where Celsius and Fahrenheit scales intersect.

Kelvin Scale

The Kelvin scale is an absolute temperature scale where 0 K represents absolute zero, the theoretical absence of all thermal energy.

About Temperature Conversion

The Temperature Converter allows you to convert between the three main temperature scales: Celsius, Fahrenheit, and Kelvin. Each scale has its own use cases and history, making temperature conversion an essential tool for science, cooking, weather reporting, and everyday life.

Temperature Scale Origins

Celsius Scale (°C)

  • Inventor: Anders Celsius (1742)
  • Base Points: 0°C (water freezing), 100°C (water boiling)
  • Usage: Most countries worldwide, scientific research
  • Also Known As: Centigrade scale

Fahrenheit Scale (°F)

  • Inventor: Daniel Gabriel Fahrenheit (1724)
  • Base Points: 32°F (water freezing), 212°F (water boiling)
  • Usage: United States, Belize, Cayman Islands
  • Interesting: Based on brine freezing point and human body temperature

Kelvin Scale (K)

  • Inventor: Lord Kelvin (1848)
  • Base Point: 0 K (absolute zero)
  • Usage: Scientific research, physics, astronomy
  • Special Feature: Absolute temperature scale, no negative values

Conversion Formulas Explained

Celsius to Fahrenheit

°F = (°C × 9/5) + 32

Multiply Celsius by 9/5 (or 1.8), then add 32. Example: 25°C = (25 × 1.8) + 32 = 77°F

Fahrenheit to Celsius

°C = (°F - 32) × 5/9

Subtract 32 from Fahrenheit, then multiply by 5/9. Example: 77°F = (77 - 32) × 5/9 = 25°C

Celsius to Kelvin

K = °C + 273.15

Add 273.15 to Celsius. Example: 25°C = 25 + 273.15 = 298.15 K

Kelvin to Celsius

°C = K - 273.15

Subtract 273.15 from Kelvin. Example: 298.15 K = 298.15 - 273.15 = 25°C

Fahrenheit to Kelvin

K = (°F - 32) × 5/9 + 273.15

Convert Fahrenheit to Celsius first, then add 273.15. Example: 77°F = (77-32)×5/9+273.15 = 298.15 K

Kelvin to Fahrenheit

°F = (K - 273.15) × 9/5 + 32

Convert Kelvin to Celsius first, then to Fahrenheit. Example: 298.15 K = (298.15-273.15)×1.8+32 = 77°F

Practical Applications

Cooking & Baking

  • Oven Temperatures: Recipes often specify °F or °C
  • Candy Making: Precise temperature control required
  • Meat Cooking: Different internal temperatures for doneness
  • Common Conversions: 350°F = 177°C, 425°F = 218°C

Weather & Climate

  • Weather Reports: Different countries use different scales
  • Climate Data: Scientific research uses Celsius and Kelvin
  • Extreme Temperatures: Record highs and lows worldwide
  • Human Comfort: Optimal range: 20-25°C (68-77°F)

Science & Medicine

  • Laboratory Work: Kelvin for absolute measurements
  • Medical: Body temperature monitoring
  • Physics: Thermodynamics and heat transfer
  • Chemistry: Reaction temperatures and phase changes

Industry & Engineering

  • Manufacturing: Process temperature control
  • Materials Science: Melting and boiling points
  • HVAC: Heating and cooling system design
  • Electronics: Component temperature limits

Temperature Conversion Tips

  • Quick Estimation: Double Celsius and add 30 for approximate Fahrenheit (20°C ≈ 70°F)
  • Freezing Point: 0°C = 32°F (memorize this reference point)
  • Body Temperature: 37°C = 98.6°F (normal human body temperature)
  • Boiling Point: 100°C = 212°F (water at sea level)
  • Negative Temperatures: Below 0°C/32°F indicates freezing conditions
  • Kelvin Note: Kelvin values are always positive; 0 K is absolute zero
  • Precision: Scientific calculations require more decimal places than everyday use
Note: Temperature conversions use exact mathematical formulas. Celsius and Fahrenheit conversions are linear, but the scales have different zero points and unit sizes. Kelvin is an absolute scale starting at absolute zero (-273.15°C). All conversions are accurate for standard atmospheric pressure.

How do I convert Celsius to Fahrenheit?

Use the formula: °F = (°C × 9/5) + 32. For example, 25°C = (25 × 9/5) + 32 = 77°F. You can also multiply Celsius by 1.8 and add 32.

What is the formula for Fahrenheit to Celsius?

Use the formula: °C = (°F - 32) × 5/9. For example, 77°F = (77 - 32) × 5/9 = 25°C. Subtract 32 from Fahrenheit, then multiply by 5/9.

How do I convert Celsius to Kelvin?

Use the formula: K = °C + 273.15. For example, 25°C = 25 + 273.15 = 298.15 K. Simply add 273.15 to the Celsius temperature.

What temperature is the same in Celsius and Fahrenheit?

-40°C is exactly equal to -40°F. This is the only temperature where the two scales intersect and show the same numerical value.

Why is Kelvin used in science?

Kelvin is an absolute temperature scale starting at absolute zero (0 K = -273.15°C). It's used in science because it directly relates to the kinetic energy of particles and has no negative values, making calculations simpler.

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