Instantly Convert Fahrenheit ↔ Celsius — Both Directions
Convert Fahrenheit to Celsius (°F → °C) or Celsius to Fahrenheit (°C → °F) instantly. Get the exact conversion with formula breakdown, reference table, and real-world examples — all free, no sign-up needed.
Fahrenheit and Celsius are the two most commonly used temperature scales in daily life. One dominates in the United States; the other is used by virtually every other country on Earth. Our free Fahrenheit to Celsius converter handles both directions instantly using the internationally accepted exact conversion formula.
The Fahrenheit scale (°F) was developed by physicist Daniel Gabriel Fahrenheit in 1724. It defines the freezing point of water at 32°F and the boiling point at 212°F — a range of 180 degrees between these two reference points. It remains the official temperature scale of the United States and is still widely used for weather, body temperature, and cooking in American daily life.
The Celsius scale (°C) was developed by astronomer Anders Celsius in 1742. It sets the freezing point of water at 0°C and the boiling point at 100°C — a clean, logical 100-degree span. It is part of the International System of Units (SI) and is used as the everyday temperature standard in almost every country outside the United States, including the UK, Australia, Canada, and all of Europe.
To convert Fahrenheit to Celsius: °C = (°F − 32) × 5/9. The logic is simple — subtract 32 to remove Fahrenheit's offset from 0°C, then multiply by 5/9 to scale the interval size. For the reverse: °F = (°C × 9/5) + 32. Both formulas are mathematically exact with no rounding or approximation required.
Choose a direction, enter your value, and get an instant conversion
The Fahrenheit to Celsius conversion is one of the most widely used temperature formulas in the world. The two scales differ both in their zero point and in the size of each degree — a 1°F change equals only a 0.556°C change. Understanding both differences is the key to mastering the formula. Both formulas below are mathematically exact with no approximation.
The table below covers the most commonly needed Fahrenheit to Celsius conversions, from extreme cold to extreme heat. All values use the exact formula °C = (°F − 32) × 5/9. For Celsius to Fahrenheit, see the second table below or use the converter above.
| Fahrenheit (°F) | Celsius (°C) | Kelvin (K) | Common Context |
|---|---|---|---|
| −40°F | −40°C | 233.15 K | Equal point — °F and °C are the same |
| −22°F | −30°C | 243.15 K | Arctic / extreme winter cold |
| 0°F | −17.78°C | 255.37 K | Very cold winter day |
| 14°F | −10°C | 263.15 K | Freezing cold — ice and snow |
| 32°F | 0°C | 273.15 K | Water freezing point |
| 41°F | 5°C | 278.15 K | Cold early morning / refrigerator |
| 50°F | 10°C | 283.15 K | Cool autumn / spring day |
| 59°F | 15°C | 288.15 K | Mild weather |
| 68°F | 20°C | 293.15 K | Standard room temperature |
| 77°F | 25°C | 298.15 K | Warm room / standard lab temp |
| 86°F | 30°C | 303.15 K | Hot summer day |
| 95°F | 35°C | 308.15 K | Very hot — heat advisory weather |
| 98.6°F | 37°C | 310.15 K | Normal human body temperature |
| 100°F | 37.78°C | 310.93 K | Mild fever / extreme heat wave |
| 104°F | 40°C | 313.15 K | High fever (medically dangerous) |
| 140°F | 60°C | 333.15 K | Very hot tap water / food safety limit |
| 176°F | 80°C | 353.15 K | Near-boiling water |
| 212°F | 100°C | 373.15 K | Water boiling point (sea level) |
| 392°F | 200°C | 473.15 K | Oven baking temperature |
| 572°F | 300°C | 573.15 K | High oven / pizza oven temp |
Need to convert the other way? The table below lists common Celsius values converted to Fahrenheit. All values use the exact formula °F = (°C × 9/5) + 32. You can also use the direction toggle on the converter above to switch to Celsius → Fahrenheit mode instantly.
| Celsius (°C) | Fahrenheit (°F) | Kelvin (K) | Common Context |
|---|---|---|---|
| −40°C | −40°F | 233.15 K | Equal point for both scales |
| −20°C | −4°F | 253.15 K | Freezer / harsh winter |
| −10°C | 14°F | 263.15 K | Cold winter day |
| 0°C | 32°F | 273.15 K | Water freezing point |
| 5°C | 41°F | 278.15 K | Refrigerator temperature |
| 10°C | 50°F | 283.15 K | Cool spring morning |
| 15°C | 59°F | 288.15 K | Mild outdoor temperature |
| 20°C | 68°F | 293.15 K | Room temperature (standard) |
| 25°C | 77°F | 298.15 K | Warm / lab standard temperature |
| 30°C | 86°F | 303.15 K | Hot summer day |
| 37°C | 98.6°F | 310.15 K | Human body temperature |
| 40°C | 104°F | 313.15 K | High fever |
| 100°C | 212°F | 373.15 K | Water boiling point |
| 180°C | 356°F | 453.15 K | Moderate oven temperature |
| 200°C | 392°F | 473.15 K | Standard baking temperature |
The Fahrenheit to Celsius conversion is one of the most frequently needed unit conversions in daily life, travel, cooking, and science. Whether you are reading an American weather forecast abroad or following a US recipe in a metric country, here are the most common situations where this conversion is essential.
American weather forecasts use Fahrenheit, while the rest of the world uses Celsius. Travellers visiting the US from metric countries — or Americans travelling abroad — regularly need to convert temperatures. A forecast of 95°F in Phoenix = 35°C (very hot), while a London forecast of 10°C = 50°F (cool jacket weather). This is the single most common everyday use of this conversion.
American recipes use Fahrenheit for oven temperatures, while ovens in the UK, Australia, and Europe are calibrated in Celsius. A recipe calling for 350°F = 176.67°C (a standard baking temperature), and 400°F = 204.44°C (a hot oven for roasting). Getting this conversion right is essential for baking success — even a 10°C error can ruin bread or cakes.
Body temperature is measured in Fahrenheit in the US and in Celsius elsewhere. Normal temperature is 98.6°F = 37°C. A fever begins above 100.4°F = 38°C, and a dangerous high fever is 104°F = 40°C. When reading medical information from US sources, or when travelling, converting temperature readings between °F and °C is a genuinely important health skill.
Students in metric countries using American textbooks frequently encounter Fahrenheit and must convert to Celsius or Kelvin for calculations. Physics, chemistry, and biology all use Celsius and Kelvin exclusively in international academic literature. Converting Fahrenheit to Celsius is a standard skill tested in secondary and university science courses worldwide. Learn more about related SI unit conversions at atmospheres to pascals.
Industrial processes — furnace temperatures, material specifications, HVAC systems — often use Fahrenheit in American engineering documents. International teams must convert to Celsius for compliance with ISO and metric standards. For example, a furnace operating at 1832°F = 1000°C is a common reference in steel and metals manufacturing across global engineering projects.
Global climate data, scientific reports, and environmental monitoring all use Celsius. When US media reports heatwave records in Fahrenheit, international audiences need to convert to understand the context. The record global average temperature rise of approximately 1.8°F above pre-industrial levels = 1°C — a critical figure in climate science that only makes sense after conversion.
The National Institute of Standards and Technology (NIST) provides the official reference data for temperature scales and conversion factors used in US science and industry — including Fahrenheit, Celsius, and Kelvin definitions.
Visit NIST →The International Bureau of Weights and Measures (BIPM) maintains the official definitions of all SI units, including the Kelvin. Their resources explain how Celsius relates to the SI system and why Fahrenheit is not an SI unit.
Visit BIPM →Need to convert other units? ConcreteMetric offers accurate, mobile-friendly converters for length, area, energy, pressure, time, and temperature — all free with no sign-up, updated for 2026.
Browse All Converters →