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Common Celsius-to-Fahrenheit conversions.
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Multiply by 9/5 (1.8) and add 32: °F = °C × 9/5 + 32. For example, 20°C × 1.8 + 32 = 68°F.
Subtract 32, then multiply by 5/9: °C = (°F − 32) × 5/9. For example, (68 − 32) × 5/9 = 20°C.
The two scales use different zero points and different-sized degrees: Celsius sets 0° at water's freezing point and 100° at boiling (at sea-level pressure), while Fahrenheit sets those same physical points at 32° and 212°, with 180 degrees spanning that same range instead of 100 — which is why the conversion needs both a multiplication (to rescale the degree size) and an offset (to shift the zero point), not just one or the other.
Doubling the Celsius value and adding 30 gets you within a few degrees of the exact Fahrenheit figure for most everyday temperatures (20°C × 2 + 30 = 70, vs. the exact 68°F) — close enough for a quick weather check, though not for anything requiring precision like a medical or cooking temperature.
Recipe books from different countries default to different scales, so oven-temperature conversion is one of the most frequent reasons people land on this page. A "moderate" 350°F oven (common in US recipes for cakes and cookies) is 177°C. A "hot" 200°C oven (common in UK, European, and Indian recipes for roasting) is 392°F. Bread-baking's classic 220°C is 428°F, and a low, slow 150°C is 302°F.
Normal human body temperature is conventionally cited as 98.6°F (37°C), and the standard adult fever threshold used clinically is 100.4°F (38°C) — both figures convert exactly using the same °F = °C × 9/5 + 32 formula as any other temperature. This calculator is a general-purpose unit converter, not a medical tool — if you're tracking an actual fever, follow your thermometer's instructions or consult a healthcare provider rather than relying on a rule of thumb.
Worked example: normal human body temperature, 37°C, converts to 37 × 1.8 + 32 = 98.6°F exactly. A 180°C European oven setting converts to 180 × 1.8 + 32 = 356°F, close to a US recipe's "350°F."
Converting other units for a recipe or measurement? Pair this with the CM to Inches Converter, the KG to Pounds Converter, or the full Unit Converter for volume, weight, and cooking-measurement conversions. Temperature alone rarely tells the whole story: the Wind Chill Calculator, Heat Index Calculator and Dew Point Calculator all give the figure that actually describes how it feels. Converting an oven temperature or a recipe? The Cooking Measurement Converter covers cups, grams and gas marks.