Temperature Converter
Convert temperatures between Fahrenheit, Celsius, and Kelvin, with the formula shown.
Temperature Converter converts in your browser.
Convert Fahrenheit, Celsius, and Kelvin
Checking an oven setting from a recipe, a weather forecast from abroad, or a lab temperature in kelvin: type the temperature, choose the scales, and the result appears as you type with the formula used. Values below absolute zero — the coldest possible temperature — are flagged with a clear message instead of producing an impossible answer.
How to use the Temperature Converter
- Type the temperature to convert. Decimals, thousands separators such as 1,250, and negative values are accepted.
- Choose the unit you are converting from and the unit you are converting to. Swap units flips them and keeps your value.
- Read the result, the conversion factor, and the same value in every other unit. Copy Result copies the main conversion; Reset returns to the starting example.
The method
°C = (°F − 32) × 5/9
°F = °C × 9/5 + 32
K = °C + 273.15
Temperature scales don’t just differ in size — they start from different zero points — so converting takes an offset as well as a multiplication. Fahrenheit degrees are 5/9 the size of Celsius degrees, and 0 °C sits at 32 °F. Kelvin uses Celsius-sized degrees but starts at absolute zero, so K is always °C + 273.15. The converter rejects any value below absolute zero instead of clamping it.
| From | To |
|---|---|
| 32 °F | 0 °C |
| 212 °F | 100 °C |
| 98.6 °F | 37 °C |
| 350 °F | 176.6666667 °C |
| -40 °C | -40 °F |
| 0 °C | 273.15 K |
| -459.67 °F | 0 K |
Converted on your device
- The conversion runs in your browser as you type; nothing is sent to a server.
- The values you enter and the results are not sent to Looty Tools or stored.
- The converter area is masked from session-recording analytics, so what you enter isn’t captured in recordings.
Limitations
- It converts temperature readings, not temperature differences: a rise of 10 °C is a rise of 18 °F, not 50 °F.
- Values below absolute zero (−273.15 °C, −459.67 °F, 0 K) are rejected.
- Only the Celsius, Fahrenheit, and Kelvin scales are included.
- Results are shown to up to 10 significant digits.
Related converters
- Weight ConverterConvert pounds, kilograms, ounces, and other weights.
- Volume ConverterConvert liters, US and UK gallons, cups, and other volumes.
Guides
- Fahrenheit vs. CelsiusLandmark temperatures on both scales, why a Celsius degree is 1.8 Fahrenheit degrees, quick estimates, and where each scale is used.
- Temperature FormulasWhere the 32 and the 5/9 in the Fahrenheit–Celsius formulas come from, how to reverse them, and why temperature differences convert differently.
- Celsius, Fahrenheit, KelvinAbsolute zero, freezing, room temperature, and boiling on all three scales, why kelvin has no degree sign, and when scientists use each.
Temperature Converter FAQ
- How do you convert Fahrenheit to Celsius?
- Subtract 32, then multiply by 5/9. 68 °F is (68 − 32) × 5/9 = 20 °C.
- How do you convert Celsius to Fahrenheit?
- Multiply by 9/5, then add 32. 25 °C is 25 × 9/5 + 32 = 77 °F.
- What is Kelvin?
- The scientific temperature scale that starts at absolute zero. It uses the same step size as Celsius, so K = °C + 273.15, and it is written without a degree sign.
- At what temperature are Fahrenheit and Celsius the same?
- −40. −40 °C and −40 °F are the same temperature.
- Why can’t I enter a temperature below absolute zero?
- Absolute zero — −273.15 °C, −459.67 °F, or 0 K — is the lowest possible temperature, so anything colder isn’t a real temperature. The converter shows a message instead of guessing.
- Can I convert a temperature difference?
- Not with this converter, which converts temperature readings. A change of 10 °C is a change of 18 °F, not 50 °F, because differences don’t include the 32-degree offset.
- Are the values I convert sent anywhere?
- No. The conversion runs in your browser as you type. The values you enter and the results are not sent to Looty Tools or stored, and the converter area is masked from session-recording analytics. Refreshing the page resets it.
