Calculators
Calculate percentage increase or decrease between two values.
Use this percentage change calculator to measure how much a value has increased or decreased relative to its starting point. It is useful for prices, traffic, sales, metrics, performance tracking, and any situation where the relative change matters more than the raw numeric difference.
Use this percentage change calculator to measure how much a value has increased or decreased relative to its starting point. It is useful for prices, traffic, sales, metrics, performance tracking, and any situation where the relative change matters more than the raw numeric difference.
Use percentage change calculator when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
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Input
100 and 120
Output
20% increase
Shows how much the new value increased relative to the starting value.
Input
80 and 60
Output
25% decrease
Useful when checking a drop from the original value.
Fix: Start with the original value and then enter the new value.
Fix: Use a standard percentage calculator if you are not comparing two time-based or before/after values.
Fix: Use a different method when the starting value is zero, because standard percentage change is not defined in the usual way.
It calculates the percentage increase or decrease from one value to another.
Yes. It is useful for growth, decline, discounts, and trend comparisons.
Yes. Decimal values work well for realistic prices, rates, and measured values.
Yes. It works online in the browser.
Raw difference shows how much the number changed directly, while percentage change shows the relative size of that change.