The common belief, that twice 10°C (or °F) equals 20°C (or °F), is wrong. To correctly multiply values, they must be at an ratio scale, which means they must have an absolute zero. Degrees Celsius (centigrade) and degrees Fahrenheit don't have this, so the value must at first be converted into kelvin, then multiplied and then converted back. This is what that calculator does.
Enter any value in °Celsius, Kelvin or °Fahrenheit, select if you want to multiply (*), divide (/) or do a percentage calculation (%), specify the factor and click Calculate. It will be rounded to two decimal places.
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