Temperature Converter

Introduction

The Temperature Converter instantly converts between Celsius, Fahrenheit, and Kelvin — essential for cooking, weather tracking, science experiments, and international communication about climate or health.

How to Use

Enter the temperature value

Select the source scale (Celsius, Fahrenheit, or Kelvin)

Select the target scale

Click "Convert" — the equivalent temperature displays instantly

Formula Reference

Celsius to Fahrenheit: °F = (°C × 9/5) + 32

Fahrenheit to Celsius: °C = (°F − 32) × 5/9

Celsius to Kelvin: K = °C + 273.15

Worked Example

If a weather report from the US states 98°F (a hot day), converting to Celsius gives (98 − 32) × 5/9 ≈ 36.7°C. This conversion helps travelers and international readers quickly understand temperature reports without needing to memorize the formula each time.

Practical Context

Temperature conversion matters for international travel (understanding foreign weather reports), cooking (oven temperatures differ between US recipes in Fahrenheit and international recipes in Celsius), medicine (body temperature readings, especially fever thresholds, are reported differently across countries), and science (Kelvin is the standard unit in physics and chemistry calculations).

FAQs

Q1: Why does the US use Fahrenheit while most other countries use Celsius?

The US retained the Fahrenheit scale from British influence during colonial times, while most other countries transitioned to the more scientifically standardized Celsius scale as part of broader metric system adoption.

Q2: What is considered a fever in Celsius versus Fahrenheit?

A fever is generally considered to start around 38°C (100.4°F) for adults, though exact thresholds can vary slightly depending on the source and measurement method used.

Q3: Why is Kelvin used in scientific contexts instead of Celsius?

Kelvin is an absolute temperature scale starting at absolute zero (the theoretical point where molecular motion stops), making it more useful for scientific calculations involving gas laws, thermodynamics, and other physics applications.

Q4: What's a quick mental trick for converting Celsius to Fahrenheit?

A rough estimate is doubling the Celsius value and adding 30 (instead of the precise 9/5 multiplier and +32) — this gives a close approximation useful for quick everyday estimates, though not perfectly precise.