Temperature Converter

A temperature converter translates a value between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Most of the world uses Celsius for weather and cooking; the US still uses Fahrenheit; Kelvin is the standard in science. Each scale has its own zero point and step size, which is why converting requires more than just multiplying by a constant.

Day-to-day, you'll convert to follow international recipes, plan travel, interpret a forecast in another country, or work through homework. This tool gives all three at once so you don't have to convert twice.

Cooking: A British recipe says 200°C. What's that in °F?

• 200 × 9/5 + 32 = 360 + 32 = 392°F
• (Set oven to 390°F or the closest setting)

Travel: The forecast in Tokyo is 28°C. Should you bring a jacket?

• 28 × 1.8 + 32 = 50.4 + 32 = 82.4°F
• Mental shortcut: 28 × 2 + 30 = 86°F (close enough)
• Definitely no jacket.

Science: Convert 37°C body temperature to Kelvin.

• 37 + 273.15 = 310.15 K

• Following international recipes — converting oven temperatures.
• Travel — interpreting weather forecasts abroad.
• Homework and lab work — switching between scientific Kelvin and everyday Celsius.
• HVAC and home automation — many smart thermostats let you switch units; this helps plan around either.
• Medical readings — a fever of 102°F vs. 38.9°C — same number, depending on the thermometer.

• Forgetting the offset. Multiplying by 1.8 alone gives the wrong answer — you also need to add 32 (or subtract for the reverse).
• Mixing up which direction. "Multiply by 5/9" converts °F to °C, not the other way.
• Confusing Kelvin step size. 1 K change = 1°C change. K is offset, not scaled.
• Reading negative numbers wrong. −10°C feels much colder than −10°F (−10°F = −23°C). Always check which scale you're reading.
• Body-temperature math. "Normal" is 36.5–37.5°C, fever starts around 38°C / 100.4°F. Don't panic at 99°F (37.2°C).