Temperature Converter

The Temperature Converter converts between three major temperature scales: Celsius (°C), Fahrenheit (°F), and Kelvin (K). It provides two conversion tabs: °C↔°F and °C↔K. Celsius (°C) is used by virtually every country in the world for everyday temperature measurement, including Korea. It was developed by Swedish astronomer Anders Celsius in 1742 and is based on the freezing point (0°C) and boiling point (100°C) of water at standard atmospheric pressure. Fahrenheit (°F) is primarily used in the United States and a few Caribbean nations for weather, cooking, and body temperature. German physicist Daniel Gabriel Fahrenheit created this scale in 1724, where water freezes at 32°F and boils at 212°F. Kelvin (K) is the SI unit of thermodynamic temperature used in science and engineering. It has the same scale increment as Celsius but starts at absolute zero (-273.15°C), the theoretical lowest possible temperature. There is no degree symbol before K. This converter is essential for understanding international weather forecasts, following American recipes, interpreting scientific data, and adjusting thermostat settings when traveling abroad.

1. Select a conversion tab. • °C ↔ °F: Convert between Celsius and Fahrenheit. Most common for weather, cooking, body temperature. • °C ↔ K: Convert between Celsius and Kelvin. Used in science, engineering, color temperature. 2. Enter a temperature value in either field. Type a number (negative values allowed) and the conversion appears instantly. 3. Read the converted result. Common Conversion Examples: • Body temperature: 36.5°C = 97.7°F | 37°C = 98.6°F (normal) | 38°C = 100.4°F (fever) • Room temperature: 20°C = 68°F | 25°C = 77°F • Freezing point: 0°C = 32°F = 273.15 K • Boiling point: 100°C = 212°F = 373.15 K • Absolute zero: -273.15°C = -459.67°F = 0 K • Oven temperatures: 180°C = 356°F | 200°C = 392°F | 220°C = 428°F Tip: Negative values are common for Celsius winter temperatures and always valid for conversion. Kelvin cannot be negative (0 K is absolute zero).

■ Celsius ↔ Fahrenheit °F = (°C × 9/5) + 32 °C = (°F - 32) × 5/9 Example: 25°C = (25 × 9/5) + 32 = 45 + 32 = 77°F Example: 98.6°F = (98.6 - 32) × 5/9 = 66.6 × 0.5556 = 37°C ■ Celsius ↔ Kelvin K = °C + 273.15 °C = K - 273.15 Example: 100°C = 100 + 273.15 = 373.15 K Example: 300 K = 300 - 273.15 = 26.85°C ■ Fahrenheit ↔ Kelvin (derived) K = (°F - 32) × 5/9 + 273.15 °F = (K - 273.15) × 9/5 + 32 ■ Where the Scales Meet -40°C = -40°F (the only point where both scales are equal) ■ Quick Reference Table -20°C = -4°F | -10°C = 14°F | 0°C = 32°F 10°C = 50°F | 15°C = 59°F | 20°C = 68°F 25°C = 77°F | 30°C = 86°F | 35°C = 95°F 37°C = 98.6°F | 40°C = 104°F | 100°C = 212°F ■ Color Temperature (Kelvin in lighting) 2700 K = warm white (incandescent) 4000 K = neutral white 5000 K = daylight 6500 K = cool daylight (overcast)

■ Quick Mental Conversion Tricks • °C to °F shortcut: Double °C and add 30. Example: 20°C → 40 + 30 = 70°F (actual: 68°F). Good for rough estimates. • °F to °C shortcut: Subtract 30, then halve. Example: 80°F → 50 ÷ 2 = 25°C (actual: 26.7°C). • For more accuracy: Double °C, subtract 10%, add 32. Example: 25°C → 50 - 5 + 32 = 77°F (exact). ■ Important Temperature References • Hypothermia: below 35°C (95°F) body temperature • Normal body temp: 36.1-37.2°C (97-99°F) • Fever: 38°C (100.4°F) and above • Heat stroke danger: above 40°C (104°F) ambient • Food safety 'danger zone': 4-60°C (40-140°F) • Water for coffee: 90-96°C (195-205°F) ■ Cooking Temperature Guide Low oven: 150°C = 300°F Moderate: 180°C = 350°F Hot: 200°C = 400°F Very hot: 230°C = 450°F Broil: 260°C = 500°F ■ Weather Context for Travelers • US 'hot day' (95°F) = 35°C • US 'cold day' (20°F) = -6.7°C • Korean summer average: 25-35°C = 77-95°F • Korean winter average: -10 to 5°C = 14-41°F ■ Common Mistakes • Don't forget to subtract 32 first when converting °F→°C • Kelvin has no degree symbol — write 'K', not '°K' • Body temperature varies by individual; 37°C is average, not exact normal for everyone