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Celsius to Fahrenheit converter

Convert °C to °F (and back) with the exact formula — weather, fever, and oven temperatures instantly, plus the anchor points worth memorizing.

1 °C = 33.8 °F

Formula: °F = °C × 9⁄5 + 32

Conversions run instantly on your device — nothing is sent anywhere.

Maintained by ToolsNexus

Convert Celsius to Fahrenheit — and back — with the exact formula, not an approximation. Loads with °C → °F preselected; the formula line under the result shows the math it used.

The formula

°F = °C × 9⁄5 + 32 · °C = (°F − 32) × 5⁄9. Temperature is the one everyday category where conversion isn’t a single multiplication: the scales start at different zeros and use different degree sizes. That’s why this page shows a formula where the linear pairs show a “multiply by” factor.

Anchor points worth memorizing

°C °F What it is
−40 −40 The scales agree
0 32 Water freezes
10 50 Cool day
20 68 Room temperature
30 86 Hot day
37 98.6 Body temperature
100 212 Water boils (sea level)
180 356 Moderate oven (~350°F)

Weather, fever, ovens

Those three cover nearly every real lookup. Weather: the double-plus-30 trick in the FAQ is fine here. Fever: it is not — 37.5 °C vs 38 °C is the difference between “monitor” and “medicate,” so use the exact 100.4 °F threshold. Ovens: recipes round (180 °C ↔ 350 °F); your oven’s thermostat is the bigger error source. Kelvin — for science homework — is also in the temperature category of the unit converter: same degree size as Celsius, offset by 273.15.

Private by design

Conversions run on your device as you type — nothing sent, nothing stored. Driving abroad instead? The km/h to mph converter is the other travel essential.

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Frequently asked questions

What is the Celsius to Fahrenheit formula?
°F = °C × 9⁄5 + 32. It is exact — 20 °C is precisely 68 °F. Reverse: °C = (°F − 32) × 5⁄9. Unlike length or weight pairs there is no single multiplier, because the scales differ by an offset (0 °C = 32 °F) as well as a step size.
What is 37 degrees Celsius in Fahrenheit — is it a fever?
37 °C = 98.6 °F, the textbook normal body temperature. Fever is commonly defined from 38 °C = 100.4 °F; high fever around 39.5 °C = 103.1 °F. (Normal actually spans roughly 36.1–37.2 °C / 97–99 °F, varying by person and time of day.)
How do I convert oven temperatures?
The recipe classics: 160 °C = 320 °F, 180 °C = 356 °F (recipes round to 350), 200 °C = 392 °F (≈400), 220 °C = 428 °F (≈425). Ovens are not precise instruments — the rounded figure on the dial is fine. Fan/convection ovens typically run recipes about 20 °C / 25 °F lower.
Is there a temperature where Celsius and Fahrenheit are equal?
Yes: −40. Set °C = °F in the formula and solve — x = 1.8x + 32 gives x = −40. It is the one point where both thermometers read the same number, and a favorite trivia check that a converter is implemented correctly.
What is the quick mental trick for weather temperatures?
Double the Celsius and add 30: 20 °C → 70 (true: 68). It overshoots as temperatures rise — at 35 °C it says 100 versus the true 95 — so treat it as weather-grade only, and use the exact formula for cooking, science, or medicine.

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