What a pay rise calculator is measuring
A pay rise is usually expressed in one of two ways. It may be given as a percentage of current salary, such as a 3% or 5% increase, or as a fixed cash amount added to pay. Some salary reviews combine both methods, which is why a modern pay rise calculator can handle a percentage uplift and a separate fixed increase at the same time.
This makes the tool useful as a free online calculator for salary review planning, offer comparison, or everyday budgeting. Instead of only hearing that pay is going up, you can calculate the new annual salary, the total annual gain, and the size of the increase per month or week. That is often more useful than a headline percentage on its own.