How the temperature converter works
Last updated 10 November 2026
This converter uses exact definitions of each unit, so results are as accurate as the number you enter.
How it works
- Celsius to Fahrenheit: °F = °C × 9 ÷ 5 + 32.
- Kelvin = °C + 273.15.
Worked example
With the starting figures:
- 25.0000 c is 77.000000 f.
Three scales
South Africa uses Celsius for weather, cooking and fridges. Fahrenheit appears on imported ovens, recipes and some thermometers. Kelvin is used in science. This converter moves between all three and shows the answer in every scale.
The sums
The tool does these sums for you with full precision and rounds only for display.
- Celsius to Fahrenheit: multiply by nine, divide by five, then add thirty-two.
- Fahrenheit to Celsius: take away thirty-two, multiply by five, then divide by nine.
- Celsius to Kelvin: add two hundred and seventy-three point one five.
Handy reference points
Water freezes at zero degrees Celsius and boils at one hundred degrees at sea level. A comfortable room is around twenty degrees. A very hot day in the Karoo can pass forty. It helps to remember a few of these, so a result that looks odd stands out.
Impossible temperatures
Nothing can be colder than absolute zero, which is zero kelvin or about minus two hundred and seventy-three degrees Celsius. If you enter a value below that, the tool tells you it is not possible instead of showing a result.
Cooking and ovens
Oven dials may use Celsius, Fahrenheit or a gas mark. Fan ovens often cook hotter than the dial says. Use the converted number as a starting point and check the food as it cooks.
Things to watch
- Temperatures below absolute zero (−273.15°C) are not possible and are rejected.
The conversion factors are definitions, not measurements. They are listed with their source in the data notes. Nothing you enter is stored or sent.
Like every tool on MoneyMzansi, this one runs entirely in your browser. There is no account, no upload and no sign-up, so it keeps working even if your connection drops once the page has loaded.