Temperature Converter: °C to °F, Kelvin & Feels Like

Celsius, Fahrenheit, and Kelvin without the mental math

Enter a temperature on any of eight scales to see the rest instantly, with the exact formula shown. Switch to difference mode to convert a change in temperature correctly, check the feels-like temperature from humidity and wind, and look up oven gas marks.

Type a value on any scale and the other two update instantly, (°C × 9/5) + 32 for Fahrenheit, + 273.15 for Kelvin. It's built for the moments the formula slips your mind: adapting a European recipe to a US oven, reading a fever in the 'other' unit, or checking a lab value against absolute zero.

Features

8 scales: Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Newton, Rømer
Δ mode for temperature differences (1°C change = 1.8°F)
Heat index (NWS), wind chill and dew point
Oven gas mark 1-9 chart with fan-oven tip
Thermometer and reference temperatures
Conversion chart, batch convert, CSV

How to use Temperature Converter

1
Enter a temperature
Type a reading and choose its scale.
2
Pick the target scale
See the result plus every other scale and the formula.
3
Convert a difference
Turn on Δ difference when converting a change, not a reading.
4
Check feels-like
Enter humidity and wind for heat index, wind chill and dew point.

Common use cases

Adapting an oven temperature between °F and °C for a recipe
Reading a fever or weather figure in the 'other' unit
Converting lab temperatures to Kelvin for calculations
Checking values against absolute zero
Converting to Rankine for thermodynamics coursework

Detailed guide

Reference points worth memorising

0°C / 32°F is freezing, 100°C / 212°F is boiling, 37°C / 98.6°F is body temperature, and −40° is the single point where both scales read the same. The converter validates against absolute zero (−273.15°C), so physically impossible inputs are caught instead of silently converted.

Conversion formulas with examples

To convert Celsius to Fahrenheit, multiply by 9/5 and add 32: 25 °C × 1.8 + 32 = 77 °F. To go the other way, subtract 32 and multiply by 5/9: 98.6 °F becomes (98.6 - 32) × 5/9 = 37 °C. Kelvin uses the same step size as Celsius but starts at absolute zero, so K = °C + 273.15, and 0 °C is 273.15 K. Kelvin is written without a degree sign. For quick mental maths, doubling Celsius and adding 30 gets you close to Fahrenheit for everyday weather, within a few degrees between about 0 and 30 °C.

Useful temperatures to know

Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level, though it boils lower at altitude. Normal body temperature is about 37 °C (98.6 °F), and a fever usually starts around 38 °C (100.4 °F). A comfortable room is about 20-22 °C (68-72 °F). Common oven settings are 180 °C (350 °F) and 200 °C (400 °F); fan ovens usually need about 20 °C less. The two scales meet at -40, where -40 °C equals -40 °F, and absolute zero is 0 K, -273.15 °C or -459.67 °F.

Frequently asked questions

How do I convert a temperature difference?

Use Δ mode. A change of 10°C equals a change of 18°F, because only the scale factor (1.8) applies, not the +32 offset.

What is the heat index?

How hot it feels when humidity slows sweating. At 32°C and 60% humidity it feels close to 40°C. The calculator uses the US National Weather Service formula.

How do I convert Celsius to Fahrenheit?

Formula: (°C × 9/5) + 32 = °F. Examples: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temperature), 20°C = 68°F (room temperature).

How do I convert Fahrenheit to Celsius?

Formula: (°F - 32) × 5/9 = °C. Examples: 32°F = 0°C, 98.6°F = 37°C, 68°F = 20°C, 212°F = 100°C.

What temperature is 37°C in Fahrenheit?

37°C = 98.6°F: this is normal human body temperature. A fever is generally considered 38°C (100.4°F) or above.

What is Kelvin and how does it relate to Celsius?

Kelvin is the scientific temperature scale where 0K = absolute zero (the coldest possible temperature). To convert Celsius to Kelvin, add 273.15. So 0°C = 273.15K, 100°C = 373.15K.

What temperature should I bake a cake?

Most cakes bake at 350°F (175°C). For reference: 325°F = 163°C, 375°F = 191°C, 400°F = 204°C, 425°F = 218°C. Use this converter to adapt recipes between US (Fahrenheit) and European (Celsius) measurements.

At what temperature are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are equal at -40 degrees: -40°C = -40°F. This is the only temperature where both scales intersect. Below this point, Celsius values are higher than Fahrenheit; above it, Fahrenheit values are higher.

What is 180C in Fahrenheit for oven recipes?

180C is 356F (often rounded to 350F on ovens). Enter any oven temperature to convert between C and F for recipes.

Temperature Converter: Celsius, Fahrenheit & Kelvin

Celsius, Fahrenheit, and Kelvin without the mental math

Features

How to use Temperature Converter

Enter a temperature

Pick the target scale

Convert a difference

Check feels-like

Common use cases