What is Fahrenheit? What is Celsius?
The Fahrenheit to Celsius Converter changes a temperature written in degrees Fahrenheit into degrees Celsius. Type a number like 68, 98.6, or 350, and the tool gives you the Celsius value as you type. It also shows the Fahrenheit to Celsius formula with your number filled in, so you can copy the math instead of trusting a black box.
What is Fahrenheit?
Fahrenheit is the temperature scale used for everyday weather, home thermostats, and ovens in the United States. Water freezes at 32 °F and boils at 212 °F at sea level. A comfortable room is around 68 °F. A moderate baking temperature is 350 °F. It is familiar if you grew up with it, and oddly specific if you did not. Fahrenheit has strong “my oven says what?” energy.
What is Celsius?
Celsius, also called centigrade, is the temperature scale used by most of the world and by science. Water freezes at 0 °C and boils at 100 °C at sea level. A mild day is around 20 °C. Normal body temperature is about 37 °C. If you read international weather, lab notes, recipes, travel forecasts, or appliance manuals, you will run into Celsius fast.
That is why a quick F to C conversion matters. It turns a local number into a widely understood one. 32 °F becomes 0 °C. 212 °F becomes 100 °C. The same physical temperature, two different scales, one less tiny annoyance in your day.
How Fahrenheit to Celsius conversion works
Fahrenheit and Celsius use different zero points and different degree sizes. You cannot just multiply by a single number. First you remove Fahrenheit’s 32-degree offset. Then you scale the remaining difference by 5/9.
°C = (°F − 32) × 5/9 — subtract 32 from the Fahrenheit temperature, then multiply by 5/9 to get Celsius.
Here is a worked example using 350 °F, a common oven setting:
(350 °F − 32) × 5/9 = 176.67 °C
The subtraction comes first: 350 − 32 = 318. Then 318 × 5/9 = 176.6666666667. The tool displays that as 176.67 °C. That matches the engine behind the Fahrenheit to Celsius Converter, which trims the internal result and shows temperatures with up to 2 decimal places.
For normal body temperature, the math is neat: (98.6 °F − 32) × 5/9 = 37 °C. For room temperature, 68 °F becomes 20 °C. For the strange little crossover point, −40 °F becomes −40 °C. Same number. Different units. A rare moment of peace between measurement systems.
The Fahrenheit to Celsius Converter also shows the head-math shortcut: subtract 30, then halve it. For 68 °F, that gives 19 °C, which is 1 °C low. Good enough for a jacket decision. Not good enough for baking, medicine, lab work, or anything with consequences.
Common Fahrenheit-to-Celsius conversions
These are the Fahrenheit to Celsius conversions people look up most often: weather, fever numbers, freezing and boiling points, and oven temperatures. Use the table when you need the answer faster than you can find the calculator app buried in a phone folder named “Utilities,” the saddest folder name in software.
| Fahrenheit | Celsius | Common meaning |
|---|---|---|
| −40 °F | −40 °C | The two scales match here |
| 0 °F | −17.78 °C | Very cold; around a home freezer |
| 32 °F | 0 °C | Water freezes |
| 50 °F | 10 °C | Cool weather; jacket territory |
| 68 °F | 20 °C | Comfortable room temperature |
| 77 °F | 25 °C | Warm room or pleasant summer day |
| 86 °F | 30 °C | Hot day |
| 98.6 °F | 37 °C | Normal body temperature |
| 100.4 °F | 38 °C | Common fever threshold |
| 212 °F | 100 °C | Water boils at sea level |
| 350 °F | 176.67 °C | Moderate oven |
| 425 °F | 218.33 °C | Hot oven |
The big landmarks are easy to remember: 32 °F is 0 °C, 68 °F is 20 °C, 98.6 °F is 37 °C, and 212 °F is 100 °C. Oven numbers are less tidy. That is why 350 f to c oven searches usually land on 176.67 °C, but many recipes round it to 175 °C or 180 °C depending on the oven and country.
Rounding is normal for cooking. It is not normal for health or science. If you are checking a fever, 100.4 °F to Celsius is 38 °C. If you are logging a lab temperature, keep the decimals your work expects. If you are roasting potatoes, your oven is probably lying by more than 1.67 °C anyway. Potatoes forgive. Chemistry does not.
When you'll need to convert Fahrenheit to Celsius
Travel is the obvious case. A forecast that says 86 °F means 30 °C. That is shorts weather for many people, “find shade now” weather for others, and “why did I pack jeans?” weather for the rest of us. A quick Fahrenheit Celsius conversion gives you a number that matches the local scale before you step outside.
Cooking is the second big one. US recipes often list ovens in Fahrenheit. Many ovens outside the US use Celsius. If a cake recipe says 350 °F, set a Celsius oven near 175–180 °C. If it says 425 °F, you are looking at about 220 °C. Use the exact number to understand the conversion, then follow the recipe’s rounding if it gives one.
Health is another common reason. Body temperature in the US is often written as 98.6 °F, while medical references in many countries use 37 °C. A fever threshold of 100.4 °F equals 38 °C. The Fahrenheit to Celsius Converter is useful here because it accepts decimals, not just whole numbers.
You may also need it for schoolwork, lab reports, appliance manuals, shipping labels, or climate data. Big Software loves turning small tasks into account-shaped chores: a unit conversion hidden behind a dashboard, a feature tied to a paid seat, or a basic answer wrapped in a 14-day trial. This page is the opposite. Open it, type the number, copy the result, leave.
Edge cases and gotchas
Negative Fahrenheit values work. So do decimal values. The Fahrenheit to Celsius Converter accepts temperatures down to −459.67 °F, which is absolute zero. That converts to −273.15 °C. If you type a colder number, the tool stops you because physics has already called the meeting and ended it.
The highest accepted value is 1,000,000,000,000 °F. That ceiling keeps nonsense inputs and infinity out of the page while still covering anything a normal person, oven, weather report, or science homework problem will throw at it.
Precision can look different across sources. The exact Fahrenheit to Celsius formula often creates repeating decimals. 350 °F equals 176.6666666667 °C internally, but the display shows 176.67 °C. Another site may show 176.7 °C, 177 °C, or round the cooking setting to 180 °C. Those are different display choices, not different math.
The “subtract 30 and halve it” trick is handy, but it drifts. At 68 °F, it gives 19 °C instead of 20 °C. At 350 °F, it gives 160 °C instead of 176.67 °C. That is not a rounding error. That is dinner taking longer than promised.
Related converters
If you need the reverse direction, use the Celsius to Fahrenheit Converter. It uses the matching formula, °F = (°C × 9/5) + 32, and shows the calculation as you type.
For more temperature units, including Kelvin, use the Temperature Converter. If your task includes temperature plus length, weight, area, or volume, the Unit Converter and Metric to Imperial Converter keep those common measurements in one place.
Each one is a single-purpose tool. No onboarding. No per-seat pricing. No AI feature bundled inside a contract you cannot cancel. Just the conversion you came for.
Frequently asked questions
What is the Fahrenheit to Celsius formula?
The formula is °C = (°F − 32) × 5/9. Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, 68 °F becomes (68 − 32) × 5/9 = 20 °C.
How do I convert Fahrenheit to Celsius quickly in my head?
Use the rough shortcut: subtract 30, then divide by 2. So 70 °F becomes about 20 °C. The real answer is 21.11 °C, so the shortcut is close enough for weather. Use the exact formula for cooking, health, school, or lab work.
What is 98.6 f to c?
98.6 °F equals 37 °C. That is the common reference value for normal body temperature. Real body temperature varies by person, time of day, measurement method, and thermometer, so treat the conversion as math, not medical advice.
What is 350 f to c oven temperature?
350 °F equals 176.67 °C. In many recipes and on many ovens, that becomes 175 °C or 180 °C. The exact conversion helps you understand the number; the rounded oven setting helps you cook without trying to set a dial to a decimal.
Is Fahrenheit to centigrade the same as Fahrenheit to Celsius?
Yes. Celsius and centigrade refer to the same scale in everyday use. “Centigrade” is the older name, based on the 100 degrees between water’s freezing and boiling points. Celsius is the standard name now.
Can I convert Celsius back to Fahrenheit?
Yes. Use °F = (°C × 9/5) + 32, or open the Celsius to Fahrenheit Converter. The reverse calculation has the same two parts: scale by 9/5, then add the 32-degree offset.
Why use this instead of a big all-in-one app?
Because converting a temperature should not require a login, a trial, a workspace, or a subscription seat. This is the full tool for the job. Also, 10% of every dollar Microapp earns goes to charity, off the top, audited quarterly.