Celsius to Fahrenheit Converter: Fast and Friendly

The formula

Celsius to Fahrenheit conversion uses F = (C × 9/5) + 32. The calculator above runs that exact formula on whatever value you enter and rounds the output to one decimal place.

Worked example: 20°C (a typical room temperature) converts to (20 × 9/5) + 32 = 36 + 32 = 68.0°F. A cooking example: a recipe calling for a 180°C oven works out to (180 × 9/5) + 32 = 324 + 32 = 356.0°F.

Reference points worth memorizing

Water freezes at 0°C / 32°F and boils at 100°C / 212°F at sea level. Normal human body temperature is roughly 37°C / 98.6°F. A rough mental-math shortcut — double the Celsius figure and add 30 — gets you close for everyday temperatures (20°C → 70°F estimate vs. the real 68°F), but it drifts further from the true value at extremes, so use the calculator for anything precise.

Where this scale difference matters

US recipes, US weather reports, and most US oven dials use Fahrenheit, while most of the rest of the world, along with scientific and medical contexts, uses Celsius. Getting this wrong isn't cosmetic: setting an oven to "180" when a recipe means 180°F rather than 180°C is a roughly 82°F temperature error, enough to burn or undercook food.

Precision and rounding

The script above does not round intermediate steps — it computes the full formula and then applies toFixed(1) to the final result, so 37°C returns 98.6°F rather than a truncated 98°F.