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Convert temperatures between Celsius, Fahrenheit, and Kelvin. Instant temperature conversion calculator.
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- ป้อนCelsius
- คลิกปุ่มคำนวณ
- อ่านผลลัพธ์ที่แสดงด้านล่างเครื่องคิดเลข
Temperature Conversion Formulas
The three main temperature scales and their conversions:
- °F = (°C × 9/5) + 32 — Celsius to Fahrenheit
- °C = (°F - 32) × 5/9 — Fahrenheit to Celsius
- K = °C + 273.15 — Celsius to Kelvin
Key reference points: Water freezes at 0°C (32°F) and boils at 100°C (212°F). Normal body temperature is approximately 37°C (98.6°F). Room temperature is about 20-22°C (68-72°F).
Quick Estimation Tricks
For a quick mental estimate:
- °C to °F: Double the Celsius and add 30 (e.g., 20°C → 40+30 = 70°F, actual: 68°F)
- °F to °C: Subtract 30 and halve it (e.g., 70°F → 40÷2 = 20°C, actual: 21.1°C)
These shortcuts are accurate within a few degrees for everyday temperatures.
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- Daniel Gabriel Fahrenheit set 0°F in 1724 as the temperature of a freezing mixture of ice, water, and ammonium chloride — the coldest he could reliably reproduce.
- Anders Celsius originally defined his scale with 100° as freezing and 0° as boiling; it was inverted after his death in 1744.
- Water boils at 100°C/212°F at sea level, but only ~93°C/200°F at the top of Mount Everest due to lower atmospheric pressure.
อัปเดตล่าสุด: March 2026
Frequently Asked Questions
At what temperature are Celsius and Fahrenheit equal?
Both scales read the same at -40 degrees. -40°C = -40°F.
Which countries use Fahrenheit?
Only the United States, Bahamas, Cayman Islands, Liberia, Palau, Micronesia, and Marshall Islands use Fahrenheit as their primary temperature scale.
What is absolute zero?
Absolute zero is the lowest possible temperature: 0 K = -273.15°C = -459.67°F. At this temperature, all molecular motion theoretically stops.