Celsius to Fahrenheit Converter
Celsius is a temperature scale where 0°C is the freezing point of water and 100°C is the boiling point. To convert Celsius to Fahrenheit, multiply by 9/5 and add 32 — so 37°C (normal body temperature) equals 98.6°F.
Convert any Celsius temperature to Fahrenheit instantly. Includes body temperature reference, fever guide, and common temperature chart.
Popular Temperature Conversions
Body Temperature & Fever Guide
| °C | °F | What it means |
|---|---|---|
| 35°C | 95°F | Below normal (hypothermia risk) |
| 36°C | 96.8°F | Low normal |
| 37°C | 98.6°F | Normal body temperature |
| 37.5°C | 99.5°F | Slightly elevated |
| 38°C | 100.4°F | Low-grade fever |
| 38.5°C | 101.3°F | Fever |
| 39°C | 102.2°F | Moderate fever |
| 40°C | 104°F | High fever |
| 41°C | 105.8°F | Very high fever — dangerous |
| 42°C | 107.6°F | Hyperpyrexia — medical emergency |
Temperature Reference Chart
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -40°C | -40°F | Where °C Equals °F |
| -30°C | -22°F | |
| -20°C | -4°F | |
| -10°C | 14°F | |
| -5°C | 23°F | |
| 0°C | 32°F | Freezing Point of Water |
| 5°C | 41°F | |
| 10°C | 50°F | |
| 15°C | 59°F | |
| 16°C | 60.8°F | |
| 18°C | 64.4°F | |
| 20°C | 68°F | Room Temperature |
| 21°C | 69.8°F | Comfortable Room Temperature |
| 22°C | 71.6°F | Ideal Room Temperature |
| 25°C | 77°F | Warm Day |
| 30°C | 86°F | Hot Day |
| 35°C | 95°F | |
| 36°C | 96.8°F | |
| 37°C | 98.6°F | Normal Body Temperature |
| 38°C | 100.4°F | Low Grade Fever |
| 39°C | 102.2°F | Moderate Fever |
| 40°C | 104°F | High Fever |
| 41°C | 105.8°F | Very High Fever — Dangerous |
| 50°C | 122°F | |
| 60°C | 140°F | |
| 70°C | 158°F | |
| 80°C | 176°F | |
| 100°C | 212°F | Boiling Point of Water |
| 150°C | 302°F | Very High Heat |
Temperature Conversion Guide
Formula: (°C × 9/5) + 32 = °F. Quick mental trick: double the Celsius value and add 30 for an approximate Fahrenheit value.
To convert Fahrenheit to Celsius: subtract 32, then multiply by 5/9.
The Celsius scale is used in most countries worldwide and in all scientific contexts. The Fahrenheit scale is primarily used in the United States.
Frequently Asked Questions
- What is 37°C in Fahrenheit?
- 37°C is 98.6°F. This is the average normal human body temperature, defined by the World Health Organization and used as the baseline on medical thermometers worldwide. The normal body temperature range is 36.1°C to 37.2°C (97°F to 99°F). A temperature above 38°C (100.4°F) is clinically considered a fever in adults. The 37°C / 98.6°F benchmark was established by German physician Carl Wunderlich in 1851 and remains the medical standard today.
- What is 38°C in Fahrenheit?
- 38°C is 100.4°F. According to the World Health Organization and most clinical guidelines, a body temperature of 38°C or above is the threshold for fever in adults. At 38.5°C (101.3°F), it is a moderate fever; at 39°C (102.2°F), a significant fever; at 40°C (104°F), a high fever that warrants medical attention. Parents are often advised to contact a doctor if a child's temperature exceeds 38°C. The 38°C / 100.4°F mark is the most important temperature reference point after normal body temperature.
- What is the formula to convert Celsius to Fahrenheit?
- The formula is: °F = (°C × 9/5) + 32. In practice: multiply the Celsius value by 1.8, then add 32. Example: 20°C × 1.8 = 36, plus 32 = 68°F. For a quick mental estimate, double the Celsius value and add 30 (this gives a result within 2–3 degrees for everyday temperatures). To convert back from Fahrenheit to Celsius: °C = (°F − 32) × 5/9. The Celsius scale was defined by Anders Celsius in 1742, anchored at 0°C (water freezes) and 100°C (water boils at sea level).
- What is 0°C in Fahrenheit?
- 0°C is 32°F. This is the freezing point of water at standard atmospheric pressure (1 atm / sea level). The 0°C anchor point is what defines the entire Celsius scale — developed by Anders Celsius in 1742. In everyday terms, 0°C is the temperature at which ice forms, roads become slippery, and water pipes are at risk of freezing. The Fahrenheit equivalent of 32°F comes from the formula: (0 × 9/5) + 32 = 32.
- What is 100°C in Fahrenheit?
- 100°C is 212°F. This is the boiling point of water at sea level (standard atmospheric pressure of 101.325 kPa). The 0–100 range of Celsius was deliberately designed around water's phase transitions — making Celsius intuitive for science, cooking, and medicine. At higher altitudes, where atmospheric pressure is lower, water boils below 100°C (for example, at 3,000 metres water boils at about 90°C). The formula gives: (100 × 9/5) + 32 = 180 + 32 = 212°F.
- When should I be concerned about a fever temperature?
- A body temperature at or above 38°C (100.4°F) is a fever. Low-grade fever is 38–38.9°C (100.4–102°F) — usually manageable with rest and fluids. A temperature of 39–39.9°C (102–103.8°F) is a moderate fever; 40°C (104°F) or above is a high fever and you should contact a doctor. In infants under 3 months, any fever above 38°C is a medical emergency. In adults, a temperature above 41°C (105.8°F) — called hyperpyrexia — requires immediate emergency care. Always use an accurate thermometer and consult a healthcare professional for medical decisions.