@teflon121 If you are measuring temperature in an environment where the temperature is stable such as at my desk(!) you can, for sure, just add an "offset". Just measure the ambient with a known and trusted thermometer and add or subtract this to the raw measurement.
If the device is going to be subjected to a wide range of temps, then you need to see if offset is satisfactory over that range.
If not...the second half of calibration is "span" which is accomplished by multiply or dividing the raw measurement. This gets fiddly and can be enjoyable like tuning a carburetor!
display = raw * span + offset, or depending on characteristics of the sensor, display = (raw + offset) * span
Span is usually a very low number like 1.2 or 0.98