SmartUnitConvert

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