Temperature Converter
Convert temperature between Celsius, Fahrenheit and Kelvin — with a body temperature fever guide.
Body temperature guide
Common temperature reference points
| Description | °C | °F | K |
|---|---|---|---|
| Water freezes | 0°C | 32°F | 273.15 K |
| Cold room | 16°C | 60.8°F | 289.15 K |
| Room temperature | 20–22°C | 68–72°F | 293–295 K |
| Comfortable warm | 25°C | 77°F | 298.15 K |
| Hot summer day (India) | 40°C | 104°F | 313.15 K |
| Normal body temp | 37°C | 98.6°F | 310.15 K |
| Water boils (sea level) | 100°C | 212°F | 373.15 K |
| Absolute zero | −273.15°C | −459.67°F | 0 K |
Celsius to Fahrenheit conversion chart
Quick reference for converting common Celsius temperatures to Fahrenheit. Formula used: °F = °C × 9/5 + 32.
| °C (Celsius) | °F (Fahrenheit) | Notes |
|---|---|---|
| −40°C | −40°F | The point where both scales meet |
| 0°C | 32°F | Water freezes |
| 10°C | 50°F | Cool day |
| 20°C | 68°F | Room temperature |
| 25°C | 77°F | Comfortable warm |
| 30°C | 86°F | Warm day |
| 35°C | 95°F | Hot day |
| 36.5°C | 97.7°F | Low end of normal body temp |
| 37°C | 98.6°F | Normal body temperature |
| 37.5°C | 99.5°F | Slightly elevated |
| 38°C | 100.4°F | Low-grade fever |
| 39°C | 102.2°F | Moderate fever |
| 40°C | 104°F | High fever — seek advice |
| 50°C | 122°F | Extreme heat |
| 60°C | 140°F | Hot water |
| 70°C | 158°F | |
| 80°C | 176°F | |
| 90°C | 194°F | |
| 100°C | 212°F | Water boils (sea level) |
| 180°C | 356°F | Common oven temperature |
How to convert Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply the Celsius value by 9/5 (or 1.8), then add 32. To go the other way — Fahrenheit to Celsius — subtract 32, then multiply by 5/9.
Conversion formulas
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (1.8) and then add 32. The formula is °F = (°C × 9/5) + 32. For example, 30°C becomes (30 × 1.8) + 32 = 86°F. To reverse it, subtract 32 from the Fahrenheit value and multiply by 5/9: °C = (°F − 32) × 5/9.
What is normal body temperature in Fahrenheit?
Normal body temperature is about 98.6°F, which equals 37°C. In practice, a healthy reading ranges from roughly 97°F to 99°F (36.1°C to 37.2°C) depending on the person, the time of day, and where the measurement is taken.
What is 100°C in Fahrenheit?
100°C equals 212°F. This is the boiling point of water at sea level. Using the formula: (100 × 9/5) + 32 = 180 + 32 = 212°F.
What is normal body temperature in Celsius?
Normal adult body temperature ranges from 36.1°C to 37.2°C (97°F to 99°F). The classic "98.6°F / 37°C" is a historical average — actual normal varies by person, time of day (lower in the morning, higher in the evening), measurement site (oral, axillary, rectal), and age.
At what temperature is a fever considered dangerous?
A temperature above 39.4°C (103°F) in adults warrants medical attention. Above 40°C (104°F) is considered a high fever and requires urgent care. In children under 3 months, any fever above 38°C (100.4°F) requires immediate medical evaluation.
Why does India use Celsius while the US uses Fahrenheit?
India uses the Celsius (centigrade) scale as part of the metric system adopted officially after independence. The Fahrenheit scale is used in the United States as a legacy unit. Celsius is used by most of the world. Kelvin is used exclusively in science and engineering.
What is absolute zero?
Absolute zero is 0 Kelvin = −273.15°C = −459.67°F. It is the lowest theoretically possible temperature, at which all molecular motion stops. It has never been perfectly achieved but scientists have gotten within billionths of a degree of it in laboratory conditions.
Why does water boil at different temperatures in the mountains?
Water's boiling point depends on atmospheric pressure. At sea level (101.3 kPa), water boils at 100°C. At altitude, atmospheric pressure is lower, so water boils at lower temperatures. At 2,000 m altitude (e.g. Shimla, Ooty), water boils at about 93°C — which is why cooking takes longer at high altitude.