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Helpful Guides

Learn the formulas, methods and concepts behind the tools you use. Each guide explains the idea step by step, with worked examples and a link to the matching tool.

Calculator Guides

Guide

How to Calculate a Percentage

Learn the basic percentage formula with simple examples.Read Guide →Guide

How to Calculate Percentage Increase

Understand percentage increases and decreases step by step.Read Guide →Guide

Percentage Difference Explained

When to compare two values against their average — and how.Read Guide →Guide

How Discounts Are Calculated

See how sale prices and savings are worked out.Read Guide →

Converter Guides

Guide

Celsius vs Fahrenheit Explained

The two temperature scales, the conversion formulas and handy reference points.Read Guide →Guide

Metric vs Imperial Units Explained

A plain-language overview of the two measurement systems.Read Guide →Guide

How to Convert Square Feet to Square Meters

Why area conversions use squared factors, with worked examples.Read Guide →

Text Guides

Guide

How Reading Time Is Calculated

The words-per-minute method behind reading time estimates.Read Guide →Guide

Words vs Characters: What Counts?

How spaces, punctuation and symbols are counted.Read Guide →Guide

When to Use Title Case

Simple rules for capitalizing headings and titles.Read Guide →

Date & Time Guides

Guide

How to Calculate Your Exact Age

Years, months and days — and how leap years affect them.Read Guide →Guide

How to Calculate the Difference Between Two Dates

Learn how date differences are calculated and when they are useful.Read Guide →Guide

What Is a Unix Timestamp?

Epoch time explained: seconds, milliseconds and UTC.Read Guide →