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Enter a temperature and instantly see it in Celsius, Fahrenheit and Kelvin.
Celsius to Fahrenheit: multiply by 9/5 and add 32. Fahrenheit to Celsius: subtract 32 and multiply by 5/9. Kelvin is Celsius plus 273.15 — the same size degree, just a different zero point.
Examples: 37 °C = 98.6 °F (normal body temperature); 100 °F = 37.8 °C (a fever); −40 is the magic point where Celsius and Fahrenheit are equal.
| Reference | °C | °F |
|---|---|---|
| Water freezes | 0 | 32 |
| Room temperature | 21–25 | 70–77 |
| Human body | 37 | 98.6 |
| Fever threshold | 38+ | 100.4+ |
| Water boils | 100 | 212 |
India uses Celsius for weather and cooking, while US recipes and appliances often use Fahrenheit — this converter bridges the gap instantly.
Anders Celsius (1742) anchored his scale to water: 0 degrees at freezing, 100 at boiling. Daniel Fahrenheit (1724) set his scale earlier with different anchors, putting water's freeze at 32 and boil at 212. Lord Kelvin then redefined the scale from physics itself: 0 kelvin is absolute zero, the point of zero thermal energy, and each kelvin is exactly one Celsius degree in size.
The conversions are exact: C to F is F = C x 9/5 + 32, F to C is C = (F - 32) x 5/9, and K = C + 273.15. Note that -40 is the magical point where Celsius and Fahrenheit agree — the one temperature you never need to convert.
A few anchors make all temperatures meaningful: comfortable room temperature is 20-25 degrees C, a refrigerator runs 3-5 degrees C, human fever starts around 38 degrees C (normal body temperature is 37 degrees C, about 98.6 degrees F), Indian summer heat waves cross 45 degrees C, and water boils at 100 degrees C at sea level — but only about 90 degrees C in high-altitude cities like Leh, which is why cooking times change in the hills.
India uses Celsius everywhere officially, but American recipes, oven manuals, and weather apps from the US still speak Fahrenheit — 350 F for baking, 70 F for a pleasant day. This converter exists precisely so those numbers stop being riddles.
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