Temperature Converter

What is Temperature and Why Do We Convert It?

Temperature measures how hot or cold something is — it affects everything from weather forecasting and cooking to industrial processes and scientific research. The problem is that different countries use completely different scales: most of the world uses Celsius (°C), the United States uses Fahrenheit (°F), and science uses Kelvin (K). Converting between these is essential in everyday life, travel, medicine, and engineering.

Temperature Conversion Formulas

These are the exact mathematical formulas used for each conversion:

      °F = (°C × 9/5) + 32

      °C = (°F − 32) × 5/9

      K = °C + 273.15

      °C = K − 273.15

      °R = °F + 459.67

      °F = °R − 459.67

Common Temperature Reference Points

Reference	Celsius (°C)	Fahrenheit (°F)	Kelvin (K)
Absolute Zero	−273.15	−459.67	0
Water Freezes	0	32	273.15
Room Temperature	22	71.6	295.15
Human Body	37	98.6	310.15
Water Boils	100	212	373.15
Oven (baking)	180	356	453.15
Sun's Surface	5,500	9,932	5,773

Real World Examples of Temperature Conversion

Weather: A hot summer day of 40°C in India = 104°F — scorching by any scale
Fever: 38.5°C body temperature = 101.3°F — requires medical attention
Oven baking: 350°F (US recipe) = 177°C — standard cake baking temperature
Refrigerator: 4°C = 39.2°F — ideal food storage temperature
Liquid nitrogen: −196°C = −320.8°F = 77 K — used in cryogenics
Cold winter: −10°C = 14°F — freezing conditions in northern regions
Steel melting point: ~1,370°C = 2,500°F — critical in metallurgy

The Four Temperature Scales Explained

Scale	Symbol	Zero Point	Used In
Celsius	°C	Water freezing (0°C)	Most of the world, science
Fahrenheit	°F	Brine freezing (32°F = water)	United States, Belize
Kelvin	K	Absolute zero (−273.15°C)	Physics, chemistry, astronomy
Rankine	°R	Absolute zero (−459.67°F)	US engineering thermodynamics

Frequently Asked Questions

How do I convert Celsius to Fahrenheit?

Use the formula: °F = (°C × 9/5) + 32. For example, 25°C = (25 × 1.8) + 32 = 45 + 32 = 77°F.

How do I convert Fahrenheit to Celsius?

Use: °C = (°F − 32) × 5/9. For example, 98.6°F = (98.6 − 32) × 5/9 = 66.6 × 0.5556 = 37°C (normal body temperature).

What is Kelvin and why is it used in science?

Kelvin is the SI base unit for temperature. It starts at absolute zero (−273.15°C) — the coldest possible temperature where all molecular motion stops. Scientists use Kelvin because it has no negative values, making calculations in thermodynamics and chemistry simpler.

What temperature is the same in both Celsius and Fahrenheit?

−40° is the one temperature where Celsius and Fahrenheit are equal: −40°C = −40°F. This is the crossover point of the two scales.

What is normal human body temperature in Fahrenheit?

Normal body temperature is 98.6°F = 37°C. A fever is typically considered above 100.4°F (38°C).

What is Rankine used for?

Rankine (°R) is an absolute temperature scale based on Fahrenheit degrees. It is used mainly in US engineering fields like thermodynamics and aerospace, where absolute temperature is needed but Fahrenheit units are preferred.

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