Temperature Converter

Worked example

0 °C = 32 °F exactly, 100 °C = 212 °F, and −40 °C = −40 °F, the one point where the two scales agree. 350 °F is 530/3 °C, so it is written ≈ 176.6666667 °C. In Oven settings mode, Gas Mark 4 is paired with 180 °C and 350 °F.

How it works

Celsius, Fahrenheit and Kelvin are related by fixed offset formulas, not a simple multiplying factor: °F = °C × 9/5 + 32, °C = (°F − 32) × 5/9 and K = °C + 273.15. Numerila uses the correct formula for each pair, with exact fractions, rather than treating temperature like an ordinary linear unit. Negative values are accepted, since negative Celsius and Fahrenheit temperatures are entirely normal. Values colder than absolute zero (−273.15 °C, equivalently 0 K or −459.67 °F) are rejected, whichever unit you pick, since no real temperature can go below it. Absolute zero itself is valid.

Oven settings mode is separate on purpose. A Gas Mark is a control setting, and recipe tables pair it with rounded Celsius and Fahrenheit figures (Gas Mark 4 is printed as 180 °C or 350 °F), while the formula would give 176.67 °C for 350 °F. Use Temperature scales for an exact conversion and Oven settings to read a recipe’s Gas Mark.

A result written as a plain number is exact. A result starting with “≈” has been rounded to 10 significant figures, because its exact decimal never ends or is too long to read comfortably. When an exact value is long, its full digits are shown underneath. The calculation itself is never rounded: only the display is.