Temperature Converter (Celsius to Fahrenheit, Kelvin, Rankine)

Free online temperature conversion. Instant, precise results for weather, cooking/oven, HVAC, and science. Try: 0°C to °F (32°F), 25°C to °F (77°F), 100°C to °F (212°F), 32°F to °C (0°C), 98.6°F to °C (37°C), 350°F to °C (176.67°C), 180°C to °F (356°F).
Home | Length Converter | Weight Converter | Area Converter | Volume Converter | Speed Converter

Common Conversions

0°C =32°F
100°C =212°F
0°C =273.15K
32°F =273.15K

Key Temperatures

Water Freezing =0°C / 32°F
Water Boiling =100°C / 212°F
Body Temperature =37°C / 98.6°F
Room Temperature =20°C / 68°F

Conversion Formulas

C to F:°F = (°C × 9/5) + 32
F to C:°C = (°F - 32) × 5/9
C to K:K = °C + 273.15
K to C:°C = K - 273.15

Temperature Conversion Guide

Definition

Temperature indicates thermal energy and is measured on scales such as Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R). Our converter performs precise °C ⇄ °F, °C ⇄ K, °F ⇄ °C, and °F ⇄ K conversions.

Origin and History

The Fahrenheit scale (Daniel G. Fahrenheit, ~1724) used brine and body temperature as reference points. The Celsius scale (Anders Celsius, 1742) later adopted 0° for water freezing and 100° for boiling. Kelvin (William Thomson, Lord Kelvin) defines absolute temperature with 0 K = −273.15°C. Rankine mirrors Kelvin on the Fahrenheit scale.

Current Use

  • Weather: Forecasts in °C worldwide and °F in the US.
  • Cooking/Oven: Common conversions like 180°C → 356°F, 200°C → 392°F, 350°F → 176.67°C.
  • HVAC/Thermostats: Home and office temperature settings across regions.
  • Science & Engineering: Calculations and data exchange using °C, K, °F, and sometimes °R.

Examples

  • 0°C → °F: 0 × 9/5 + 32 = 32°F
  • 25°C → °F: 25 × 9/5 + 32 = 77°F
  • 100°C → °F: 100 × 9/5 + 32 = 212°F
  • 350°F → °C: (350 − 32) × 5/9 = 176.67°C

Popular Temperature Conversions

  • Celsius to Fahrenheit: °F = (°C × 9/5) + 32
  • Fahrenheit to Celsius: °C = (°F − 32) × 5/9
  • Celsius to Kelvin: K = °C + 273.15
  • Kelvin to Celsius: °C = K − 273.15
  • Fahrenheit to Kelvin: K = (°F + 459.67) × 5/9

Frequently Asked Questions