Convert Fahrenheit to Celsius Instantly
Use this Fahrenheit to Celsius converter to change temperatures from degrees Fahrenheit (°F) to degrees Celsius (°C) with accurate decimal results. Enter any temperature, switch to the reverse Celsius-to-Fahrenheit calculator, convert an entire temperature range, or compare Fahrenheit, Celsius and Kelvin in one multi-unit tool.
Convert Fahrenheit to Celsius, reverse Celsius to Fahrenheit, translate a minimum-and-maximum temperature range, or convert one temperature among Fahrenheit, Celsius and Kelvin.
Enter a Fahrenheit temperature to calculate the equivalent value in Celsius and Kelvin.
Negative temperatures and decimals are supported.
Reverse the conversion by multiplying Celsius by 9/5 and adding 32.
Convert a low and high Fahrenheit value together—useful for weather, equipment ranges and process limits.
Enter one temperature and choose its starting scale to convert among °F, °C and K.
Fahrenheit and Celsius are two widely recognized temperature scales. Fahrenheit is commonly encountered in everyday weather reports, household thermostats, ovens and other applications in the United States, while Celsius is widely used internationally and alongside the International System of Units for scientific, technical and everyday temperature reporting.
Unlike many unit conversions, Fahrenheit to Celsius is not performed with a single multiplication factor. The two scales have different zero points as well as different degree sizes. To convert a Fahrenheit temperature, first subtract 32, then multiply by 5/9.
Example: (68 − 32) × 5/9 = 20 °C.
Example: (20 × 9/5) + 32 = 68 °F.
The Fahrenheit-to-Celsius relationship used in this calculator follows the conversion expression published by the U.S. National Institute of Standards and Technology (NIST): NIST SP 811 Appendix B.8. NIST also explains on its SI Units – Temperature page that a Celsius degree interval corresponds to 1.8 Fahrenheit degrees and that 0 °C corresponds to 273.15 K.
For the SI definition of thermodynamic temperature, see the BIPM kelvin reference. The kelvin is the SI base unit of thermodynamic temperature; Celsius temperatures use the same size interval as kelvin but a shifted zero point.
Use this Fahrenheit to Celsius chart for common weather, household, cooking and reference temperatures. Values are rounded where appropriate. Enter any value in the calculator above if you need more decimal places.
| Fahrenheit (°F) | Celsius (°C) | Kelvin (K) | Reference |
|---|---|---|---|
| −40 °F | −40 °C | 233.15 K | Fahrenheit and Celsius are equal |
| −22 °F | −30 °C | 243.15 K | Very cold |
| −4 °F | −20 °C | 253.15 K | Very cold |
| 14 °F | −10 °C | 263.15 K | Below freezing |
| 32 °F | 0 °C | 273.15 K | Water freezing point |
| 41 °F | 5 °C | 278.15 K | Cool |
| 50 °F | 10 °C | 283.15 K | Mild/cool |
| 59 °F | 15 °C | 288.15 K | Mild |
| 68 °F | 20 °C | 293.15 K | Room-temperature example |
| 77 °F | 25 °C | 298.15 K | Warm |
| 86 °F | 30 °C | 303.15 K | Hot weather |
| 95 °F | 35 °C | 308.15 K | Very warm |
| 104 °F | 40 °C | 313.15 K | High temperature |
| 122 °F | 50 °C | 323.15 K | Very high temperature |
| 212 °F | 100 °C | 373.15 K | Water boiling point at standard pressure |
(50 − 32) × 5/9 = 10 °C.
(68 − 32) × 5/9 = 20 °C.
(77 − 32) × 5/9 = 25 °C.
(95 − 32) × 5/9 = 35 °C.
Start with 72 °F. Subtract 32 to get 40. Multiply 40 by 5/9, which gives approximately 22.2222. Therefore, 72 °F ≈ 22.22 °C. For everyday weather or room-temperature use, rounding to one decimal place may be sufficient.
For −4 °F, subtract 32 to obtain −36, then multiply by 5/9. The result is exactly −20 °C. The same formula works below zero; there is no need for a different rule for negative temperatures.
Many unit conversions involve a single scale factor because both units share the same zero point. Fahrenheit and Celsius do not. Their degree sizes differ, and the zero values are offset from one another. On the Celsius scale, the freezing point of water is 0 °C under the conventional reference condition, while the corresponding Fahrenheit value is 32 °F.
The 5/9 factor accounts for the difference in degree size, while subtracting 32 accounts for the scale offset. That is why multiplying Fahrenheit directly by 5/9 gives the wrong answer for an actual temperature.
The two scales have different zero points and degree sizes, but key reference temperatures can be aligned directly.
Both scales describe temperature, but they number the same physical temperatures differently. The Celsius scale is tied to the kelvin by a fixed offset: 0 °C corresponds to 273.15 K, and a Celsius degree interval has the same magnitude as a kelvin interval. Fahrenheit uses smaller degree intervals: a 1 °C change equals a 1.8 °F change.
This difference explains why a weather change from 20 °C to 25 °C represents a 5 °C increase but a 9 °F increase, from 68 °F to 77 °F. For changes or intervals, you multiply Celsius differences by 1.8 or Fahrenheit differences by 5/9; the 32-degree offset does not apply to the interval itself.
For an exact manual conversion, use the full formula: subtract 32 and multiply by 5/9. If you only need a quick mental estimate, a rough shortcut is to subtract 30 and divide by 2. For example, 86 °F becomes (86 − 30) ÷ 2 = 28 °C by the shortcut, while the exact result is 30 °C. The shortcut is convenient for fast orientation but should not replace the exact formula when precision matters.
For technical, scientific, cooking, engineering or health-related decisions, use the exact formula and appropriate measurement equipment rather than relying on a mental approximation.
Weather is one of the most common reasons to convert Fahrenheit to Celsius. A forecast of 50 °F is 10 °C, 68 °F is 20 °C, 77 °F is 25 °C, 86 °F is 30 °C and 95 °F is 35 °C. Learning these anchor points can make it easier to understand a forecast without converting every single value.
The range converter above is useful when a forecast is given as a daily low and high. For example, 50–77 °F converts to 10–25 °C. Because the converter processes both endpoints with the same formula, you can compare an entire range instantly.
Recipes may use Fahrenheit or Celsius depending on where they were published. Common oven settings include approximately 300 °F = 148.9 °C, 325 °F = 162.8 °C, 350 °F = 176.7 °C, 375 °F = 190.6 °C, 400 °F = 204.4 °C and 425 °F = 218.3 °C. In practical cooking, oven controls often use rounded settings, so a recipe or appliance guide may recommend a nearby standard Celsius value rather than the mathematical decimal result.
Always follow the appliance manufacturer or recipe instructions when exact cooking behavior matters. The converter performs the temperature-scale calculation only and does not adjust for fan/convection ovens, altitude, calibration differences or cooking time.
Kelvin is the SI base unit of thermodynamic temperature. A Celsius temperature can be converted to Kelvin by adding 273.15. Fahrenheit can be converted to Kelvin by first converting to Celsius and then adding 273.15, or by using the equivalent direct formula.
Example: 68 °F = 20 °C = 293.15 K.
Kelvin is written without a degree symbol. Temperatures below 0 K are not valid on the ordinary thermodynamic temperature scale, so the multi-unit calculator checks Kelvin input against absolute zero.
Multiplying °F by 5/9 alone gives the wrong absolute temperature.
°F → °C uses 5/9; °C → °F uses 9/5.
Temperature changes do not use the 32-degree offset.
Keep the full calculation and round only the final displayed result.
Continue with related converters including Celsius to Fahrenheit, Kelvin to Celsius, Kelvin to Fahrenheit, Celsius to Kelvin and Fahrenheit to Kelvin. Using a direct converter helps avoid unnecessary intermediate rounding when you already know the starting and target temperature scales.
Quick answers about °F, °C, Kelvin and temperature conversion.