Celsius to Fahrenheit Calculator

Temperature reading converter

Convert Celsius and Fahrenheit

Convert degrees Celsius to Fahrenheit or Fahrenheit to Celsius with the correct scale ratio, 32-degree offset, and absolute-zero limits.

Result

0 °C = 32 °F

Reference relationship0 °C = 32 °F exactly

Formula useddegrees Fahrenheit = degrees Celsius × 9/5 + 32

Unit relationship

0 °C = 32 °F exactly

Degrees CelsiusA Celsius interval has the same magnitude as one kelvin.

Degrees FahrenheitA customary temperature scale with water freezing at 32 °F.

Celsius and Fahrenheit have different zeros and interval sizes. The two scales read the same numerical value at −40.

Worked example

Convert 20 °C to °F

1
Start with the degree Celsius value
Use 20 °C.
2
Apply the exact relationship
Multiply the Celsius value by 9/5, then add 32.
3
Write the degree Fahrenheit unit
20 °C = 68 °F.

Quick reference

Degrees Celsius to Degrees Fahrenheit conversion table

Common °C values converted to °F
Degrees Celsius (°C)	Degrees Fahrenheit (°F)
-273.15 °C	-459.67 °F
-40 °C	-40 °F
0 °C	32 °F
10 °C	50 °F
20 °C	68 °F
37 °C	98.6 °F
100 °C	212 °F

Everyday temperature translation

Turn Celsius readings into Fahrenheit without losing their meaning

Weather reports, recipes, room settings, and recorded observations often arrive in Celsius but must be communicated to a Fahrenheit-reading audience. The offset is as important as the scale ratio.

Side-by-side guide · Everyday temperature translation

A temperature interval does not use the +32 offset

Reading formula: °F = °C × 9/5 + 32
Crossing point: −40 °C = −40 °F
Lowest reading: −273.15 °C = −459.67 °F

Converting a reading
A thermostat reading of 20 °C becomes 68 °F because the calculation changes the degree size and relocates the zero point.
Converting a change
A rise of 10 Celsius degrees is a rise of 18 Fahrenheit degrees. Adding 32 to an interval would confuse a difference with an absolute reading.
Checking moisture-related weather
When the number is part of a humidity question rather than a plain scale translation, use the dew point calculator so air temperature and moisture are handled together.

Turn Celsius readings into Fahrenheit without losing their meaning: Weather reports, recipes, room settings, and recorded observations often arrive in Celsius but must be communicated to a Fahrenheit-reading audience. The offset is as important as the scale ratio.

A Celsius reading needs both a scale change and an offset

Celsius and Fahrenheit do not place zero at the same physical temperature, and their degree intervals are not the same size. To translate a reading, multiply the Celsius number by 9/5 and then add 32. The order matters. Twenty degrees Celsius becomes 68 °F; adding 32 before applying the ratio would produce the wrong answer.

The formula is exact, but many temperatures encountered in life are not fixed standards. NIST labels its weather, body-temperature, and oven touchstones as approximate. Treat 20 °C = 68 °F as an exact conversion of the entered number, not a promise that every comfortable room is precisely 20 °C or that an appliance holds one uniform temperature.

Useful landmarks for weather, kitchens, and daily readings

A few conversions help a Fahrenheit reader interpret a Celsius source before a calculator is even opened.

0 °C converts to 32 °F, a familiar freezing reference for water under ordinary stated conditions.
10 °C converts to 50 °F, 20 °C to 68 °F, and 30 °C to 86 °F, creating a practical weather sequence.
37 °C converts to 98.6 °F mathematically, although an individual body temperature varies and the conversion is not a medical interpretation.
100 °C converts to 212 °F; the actual boiling temperature of water depends on pressure, so the physical landmark should not be presented without context.

A temperature interval does not use the +32 offset

Converting a reading

A thermostat reading of 20 °C becomes 68 °F because the calculation changes the degree size and relocates the zero point.

Converting a change

A rise of 10 Celsius degrees is a rise of 18 Fahrenheit degrees. Adding 32 to an interval would confuse a difference with an absolute reading.

Checking moisture-related weather

When the number is part of a humidity question rather than a plain scale translation, use the dew point calculator so air temperature and moisture are handled together.

Move to the neighbouring tool only when the task changes

If the source is already in Fahrenheit and the destination is Celsius, the Fahrenheit-to-Celsius calculator begins with that reading direction and explains the subtraction-first workflow. Laboratory or thermodynamic data belongs in the kelvin-to-Celsius calculator, which enforces the absolute-zero boundary and uses K without a degree sign.

For Rankine or a different supported temperature pair, open the general conversion calculator. Values below −273.15 °C are rejected because they would imply a thermodynamic temperature below 0 K. The calculator changes the scale representation; it does not calibrate a thermometer, correct a sensor, or issue a weather or medical judgment.

Important limitations

This calculator converts absolute temperature readings, not temperature differences. Values below 0 K are invalid, and real freezing or boiling points vary with pressure and composition.

Review the stated scope, calculation method, assumptions, supported inputs, and effective dates, and obtain qualified advice before using a high-stakes result.

This formula passed its registered engineering tests and is published under an explicit site-owner policy authorization. No independent expert, QA, editorial, legal, or third-party review is claimed. Verify consequential results with a qualified professional.

Everyday temperature translation

Turn Celsius readings into Fahrenheit without losing their meaning

Weather reports, recipes, room settings, and recorded observations often arrive in Celsius but must be communicated to a Fahrenheit-reading audience. The offset is as important as the scale ratio.

Side-by-side guide · Everyday temperature translation

A temperature interval does not use the +32 offset

Reading formula: °F = °C × 9/5 + 32
Crossing point: −40 °C = −40 °F
Lowest reading: −273.15 °C = −459.67 °F

Converting a reading
A thermostat reading of 20 °C becomes 68 °F because the calculation changes the degree size and relocates the zero point.
Converting a change
A rise of 10 Celsius degrees is a rise of 18 Fahrenheit degrees. Adding 32 to an interval would confuse a difference with an absolute reading.
Checking moisture-related weather
When the number is part of a humidity question rather than a plain scale translation, use the dew point calculator so air temperature and moisture are handled together.

A Celsius reading needs both a scale change and an offset

Useful landmarks for weather, kitchens, and daily readings

A few conversions help a Fahrenheit reader interpret a Celsius source before a calculator is even opened.

0 °C converts to 32 °F, a familiar freezing reference for water under ordinary stated conditions.
10 °C converts to 50 °F, 20 °C to 68 °F, and 30 °C to 86 °F, creating a practical weather sequence.
37 °C converts to 98.6 °F mathematically, although an individual body temperature varies and the conversion is not a medical interpretation.
100 °C converts to 212 °F; the actual boiling temperature of water depends on pressure, so the physical landmark should not be presented without context.

A temperature interval does not use the +32 offset

Converting a reading

A thermostat reading of 20 °C becomes 68 °F because the calculation changes the degree size and relocates the zero point.

Converting a change

A rise of 10 Celsius degrees is a rise of 18 Fahrenheit degrees. Adding 32 to an interval would confuse a difference with an absolute reading.

Checking moisture-related weather

When the number is part of a humidity question rather than a plain scale translation, use the dew point calculator so air temperature and moisture are handled together.