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Temperature Converter

Convert temperatures between Celsius, Fahrenheit and Kelvin. Unlike length or weight, temperature scales have different zero points, so each conversion uses its own formula — shown below.

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Result
3.28084 ft

Conversion table

Unit Value
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How it works

Because the scales have different zero points, temperature uses offset formulas rather than a single factor. From Celsius (°C):

Converting back to Celsius:

Worked example

Convert 100 °C (boiling water) to the other scales:

And body temperature 98.6 °F back to Celsius: (98.6 − 32) × 5/9 = 37 °C.

Kitchen and weather anchors worth memorising: a moderate oven of 180 °C = 356 °F (most US recipes round to 350 °F); a hot summer day of 35 °C = 95 °F; and a freezing winter morning of −10 °C = 14 °F. For a quick mental estimate going Celsius → Fahrenheit, double it and add 30 (exact answer: ×1.8 + 32) — 20 °C ≈ 70 °F by the shortcut vs 68 °F exactly.

Frequently asked questions

What is the formula to convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (i.e. 1.8) and add 32: °F = (°C × 9/5) + 32. So 20 °C becomes (20 × 1.8) + 32 = 68 °F.
At what temperature do Celsius and Fahrenheit read the same?
They meet at −40 degrees: −40 °C equals −40 °F. It's the one point where the two scales give the identical number.
What is Kelvin and why use it?
Kelvin is the SI base unit of temperature. It starts at absolute zero (0 K = −273.15 °C), the coldest possible temperature, so it has no negative values. Each kelvin is the same size as one degree Celsius.
What are the freezing and boiling points of water?
At standard pressure, water freezes at 0 °C (32 °F, 273.15 K) and boils at 100 °C (212 °F, 373.15 K).
What oven temperature is 180 °C in Fahrenheit?
180 °C is 356 °F — US recipes usually call this 350 °F ('moderate oven'). Other common settings: 160 °C ≈ 325 °F, 200 °C ≈ 400 °F, 220 °C ≈ 425 °F. UK 'gas mark 4' is the same moderate 180 °C/350 °F.
Is there a quick way to convert in my head?
Celsius to Fahrenheit: double it and add 30 (rough), or ×1.8 + 32 (exact). Fahrenheit to Celsius: subtract 30 and halve it. The shortcut is within a few degrees for everyday weather temperatures.

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