Blog
Practical guides on the calculations behind our tools.
Understanding Compound Interest (And Why It's Called the Eighth Wonder)
How compound interest actually works, a worked savings example, and what to look for in a high-yield savings account.
Read article →Best Image Compression Methods for the Web (Without Losing Quality)
How lossy and lossless compression differ, which image formats to pick for photos vs. graphics, and a practical workflow for shrinking files before you upload.
Read article →How Percentages Work: A Refresher You Can Actually Use
The three most common percentage calculations explained with real examples — percentage of a number, percentage of total, and percentage change.
Read article →How to Calculate BMI (And What Your Number Actually Means)
A plain-language walkthrough of the BMI formula, worked examples in metric and imperial units, and the limitations you should know about.
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