Blog

Plain-English guides to the calculations behind our tools. No fluff, just useful explainers.

How to Calculate BMI at Home (Step by Step, with Examples)

Learn how to calculate your BMI by hand in two minutes — the formula, a worked example in both metric and imperial units, and what to do with the result.

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How Much House Can I Afford? A Realistic Guide

A simple, honest guide to how much house you can afford — the 28/36 rule, what mortgages don't include, and how to stress-test your budget before you buy.

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Compound Interest Explained Simply (with Real Numbers)

Compound interest in plain English — what it is, why time matters more than the amount, and a concrete example showing how $200 a month becomes six figures.

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How Much to Tip: A Country-by-Country Guide

A practical tipping guide for restaurants, taxis, hotels, and delivery — covering the US, UK, Europe, and Asia, plus when not to tip at all.

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