Percentage Difference Calculator

This calculator finds the percentage difference between two values, the measure to use when neither number is a clear starting point and you just want to know how far apart they are relative to each other. Unlike percentage change, which compares a new figure back to an old one by dividing by that old value, percentage difference divides the gap between the two numbers by their average, so it does not matter which one you enter first or which is bigger. You enter a first value and a second value, such as two quotes from different tradespeople, two test results, or two prices for the same item, and the calculator returns the percentage difference between them, along with the actual difference and the average used to work it out. This makes it useful for comparing quotes side by side, checking how much two measurements diverge, or seeing how close two prices really are before deciding between them. Because it is symmetric, swapping the two values gives the same percentage every time, which is exactly what you want when comparing two independent figures rather than tracking a change over time. If you are instead measuring how much something has risen or fallen from an original figure, such as an old price to a new price, use a percentage change calculator instead, since that uses the earlier value as the fixed base.

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