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Each article opens with a quick answer and table of contents, then walks through definitions, formulas, steps, and examples. Use the calculator on the home page whenever you already have two numbers.

Latest articles

What is percentage change?

Definition, meaning, change versus difference, why percent change matters, and everyday applications before you touch advanced finance topics.

Percentage change formula

The standard increase and decrease formula, sign behavior, and when the expression is undefined, with plain-language explanation.

How to calculate percentage change

Step-by-step calculation, manual checks, calculator use, spreadsheet patterns, and shortcuts that catch sign errors early.

Using the percentage change calculator

Original and new inputs, how to read the result, increase and decrease cues, zero baseline behavior, and quick practice pairs.

Percentage change examples

Worked price, revenue, salary, population, and investment examples with the same formula so you can verify in a sheet or on the home calculator.

Percentage increase calculator

Growth-style percentage change: formula, sales and inflation style wording, and how to keep the baseline obvious in business copy.

Percentage decrease calculator

Reduction and discount style percentage change, revenue decline, depreciation intuition, and loss percentage wording with the same formula.

Percentage change vs percentage difference

Key differences, formula comparison, correct usage, common mistakes, percentage points, and examples for rates and raw counts.

Average percentage change

Simple averages across period changes, geometric intuition, and why averaging percents blindly can mislead compared to CAGR.

CAGR vs percentage change

When a single percentage change between two endpoints is enough, versus when compound annual growth rate (CAGR) is the clearer summary.