How to Use This Calculator
- Enter temperature degree: Input any positive, zero, or negative number.
- Choose conversion scales: Select input and output units between Celsius, Fahrenheit, and Kelvin.
- Review physical reference benchmarks: Observe the temperature relative to water freezing, body heat, and boiling points.
Formula and Calculation Steps
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
°C = K − 273.15Worked Examples and Reference Table
| Physical Phenomenon | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute Zero | −273.15°C | −459.67°F | 0 K |
| Freezing Point of Water | 0°C | 32°F | 273.15 K |
| Normal Human Body Temp | 37°C | 98.6°F | 310.15 K |
| Boiling Point of Water | 100°C | 212°F | 373.15 K |
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
Multiply the temperature in Celsius by 9/5 (or 1.8), then add 32: °F = (°C × 1.8) + 32.
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9: °C = (°F − 32) × (5 ÷ 9).
What is absolute zero?
Absolute zero is the theoretical point where thermodynamic system energy reaches its minimum. It is defined as 0 Kelvin, −273.15° Celsius, or −459.67° Fahrenheit.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are equal at exactly −40 degrees (−40°C = −40°F).
Why does the Kelvin scale not use degrees?
Kelvin is an absolute thermodynamic unit of measurement rather than an arbitrary scale based on water freezing/boiling, so standard scientific convention omits the degree symbol (e.g. 300 K, not 300°K).