Celsius to Fahrenheit

What is the Celsius to Fahrenheit converter?

This is a free, instant tool for converting Celsius to Fahrenheit — and Fahrenheit back to Celsius — without doing the math yourself. Type a value into either box and the other one updates as you type, so a number you read on a foreign thermometer, weather app, recipe, or medical chart becomes the scale you actually think in. Celsius (°C) is the everyday metric scale used by most of the world; Fahrenheit (°F) is the standard in the United States. Whenever those two worlds meet, this converter is the one-second bridge.

How to use it

1. Type a number into the Celsius box to convert °C to °F, or into the Fahrenheit box to convert the other way.
2. Read the result instantly in the other box — there is no Convert button and nothing to submit.
3. Or skip typing entirely: use the everyday reference table above and find the temperature you need (fever, oven heat, room temperature) already worked out.

It is built mobile-first, so you can do it one-handed on a phone, get your answer, and close the tab.

The formula behind it

The conversion uses a simple linear formula:

°F = °C × 9/5 + 32

You multiply the Celsius value by 9/5 (which is 1.8) and add 32. To go the other way:

°C = (°F − 32) × 5/9

The "× 9/5" accounts for the fact that one Celsius degree is larger than one Fahrenheit degree, and the "+ 32" shifts the zero point, because 0 °C (water freezing) sits at 32 °F. There is one number where the two scales agree exactly: Both scales meet at exactly minus forty, so −40 °C equals −40 °F.

Examples

• 0 °C → 32 °F — water freezes.
• 20 °C → 68 °F — a comfortable room.
• 37 °C → 98.6 °F — normal body temperature.
• 100 °C → 212 °F — water boils at sea level.
• 180 °C → 356 °F — a common moderate oven setting.

Common use cases

• Travel: reading the weather forecast or a thermostat in a country that uses the other scale.
• Cooking and baking: converting oven temperatures between a US recipe (°F) and a European one (°C).
• Health: checking whether a thermometer reading means a fever (37 °C / 98.6 °F is normal; 38 °C / 100.4 °F is a mild fever).
• Study and work: science homework, lab notes, and engineering specs that mix the two scales.

Why use this one

Most pages force you to pick a direction — a separate page for "celsius to fahrenheit" and another for "fahrenheit to celsius." This one is bidirectional on a single page: edit either field and the other follows live. It adds a real-life reference table so the most-searched temperatures (body temp, fever, oven heat) are answered before you type a thing. And it runs entirely in your browser — instant, no sign-up, your numbers never leave your device, with just one unobtrusive ad.

For related metric and imperial conversions, see our cm to inches, kg to lbs, and km to miles converters.

Frequently asked questions