Percentages

What Is Percentage Calculation?

Understand what percentages mean, how the core formula works, and when to use it.

10 min read · Practical examplesPercentages

How to Calculate Percentage Increase

Learn the percentage increase formula with price, salary, and growth examples.

10 min read · Practical examplesPercentages

Percentage Decrease Explained

Calculate decreases accurately and avoid common baseline mistakes.

10 min read · Practical examplesPercentages

Percentage Difference vs. Percentage Change

Choose the right comparison formula when values have or do not have a baseline.

10 min read · Practical examplesAverages

How to Calculate an Average

A practical guide to the arithmetic mean, from the formula to interpretation.

10 min read · Practical examplesAverages

Mean, Median, and Mode Explained

Compare three measures of center and learn which one fits your data.

10 min read · Practical examplesAverages

Weighted Average: A Practical Guide

Learn why some values count more than others and how to calculate a weighted mean.

10 min read · Practical examplesAverages

When an Average Can Be Misleading

Recognize outliers, skew, and missing context before relying on a mean.

10 min read · Practical examplesDates

How Is Exact Age Calculated?

See how calendar years, month lengths, and leap days affect exact age.

10 min read · Practical examplesDates

Leap Years and Age Calculation

Understand February 29 birthdays and the calendar rules behind leap years.

10 min read · Practical examples