Temperature Converter
トレンド 🔥Convert between Celsius, Fahrenheit, and Kelvin.
Temperature Converter の使い方
- 1Enter a temperature value
- 2Select the source unit (°C, °F, K, or °R)
- 3See all other equivalents instantly
Temperature Converter について
The Temperature Converter converts between all four common temperature scales: Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R). Enter a temperature in any scale and all other equivalents appear instantly without additional steps.
Celsius and Fahrenheit are the scales used in everyday weather and cooking. Kelvin is the SI unit used in physics and chemistry, with 0 K being absolute zero. Rankine is an absolute scale using Fahrenheit-degree intervals, used in some engineering contexts.
All conversions use exact formulas and run entirely in your browser with no server communication. Whether checking a cooking temperature, converting weather forecasts, or doing scientific work, results are accurate and instant.
Temperature Converterの主な機能
- Convert between Celsius, Fahrenheit, Kelvin, and Rankine
- All four equivalents shown simultaneously
- Exact conversion formulas for all scale pairs
- Handles negative temperatures correctly (important for Celsius/Fahrenheit)
- Correctly enforces the absolute zero constraint for Kelvin and Rankine
- Useful for cooking, weather, science, and engineering
- Instant results as you type
- Fully browser-based with no server dependency
対応フォーマット
入力フォーマット
出力フォーマット
°F = (°C x 9/5) + 32. K = °C + 273.15. °R = °F + 459.67. Kelvin and Rankine cannot go below 0 (absolute zero).
使用例
Convert body temperature
Convert normal human body temperature from Fahrenheit to Celsius.
入力
98.6°F
出力
37°C | 310.15 K | 558.27°R
Convert oven temperature
Convert a recipe oven temperature from Celsius to Fahrenheit.
入力
180°C
出力
356°F | 453.15 K | 815.67°R
主な使用ケース
- Converting recipe temperatures between Celsius and Fahrenheit ovens
- Understanding weather forecasts in the unfamiliar temperature scale
- Converting scientific measurements from Celsius to Kelvin
- Engineering calculations using Rankine scale thermodynamics
- Teaching temperature scale relationships in physics classes
- Checking freeze and boil point equivalents across scales
トラブルシューティング
Entering a Kelvin value below 0
解決策
Kelvin starts at absolute zero (0 K = -273.15°C). Values below 0 K are physically impossible. The calculator will not produce valid results for negative Kelvin inputs.
Forgetting that Fahrenheit and Celsius have different zero points
解決策
Celsius freezes water at 0° and Fahrenheit freezes water at 32°. This offset means you cannot simply multiply by a conversion factor — you must use the full formula: °F = (°C x 9/5) + 32.
Confusing °C and K for small differences
解決策
A temperature difference of 1°C is the same as a difference of 1 K. However, absolute values differ by 273.15. 0°C = 273.15 K, not 0 K.
よくある質問
How do I convert Celsius to Fahrenheit?
Use the formula: °F = (°C x 9/5) + 32. For example, 100°C = (100 x 9/5) + 32 = 180 + 32 = 212°F.
What is absolute zero?
Absolute zero is the lowest theoretically possible temperature, at which all thermal motion stops. It equals 0 K, -273.15°C, or -459.67°F.
What is Kelvin and when is it used?
Kelvin is the SI base unit of temperature, starting at absolute zero. It is used in physics, chemistry, and engineering because its absolute scale simplifies thermodynamic equations.
What is the Rankine scale?
Rankine is an absolute temperature scale that uses Fahrenheit-degree intervals. 0°R = absolute zero = -459.67°F. It is primarily used in some US engineering and thermodynamics applications.
What is the freezing and boiling point of water in each scale?
Water freezes at 0°C / 32°F / 273.15 K / 491.67°R. Water boils at 100°C / 212°F / 373.15 K / 671.67°R at standard atmospheric pressure.
Can I convert negative temperatures?
Yes. The converter handles negative Celsius and Fahrenheit values correctly. Kelvin and Rankine, being absolute scales, cannot go below zero.
Is this useful for cooking conversions?
Yes. Many international recipes specify oven temperatures in Celsius, while US ovens often display Fahrenheit. Enter either value and get the other instantly.
Is my data private?
Yes. All conversions run entirely in your browser. No values are transmitted to any server.