Blog
Guides and worked examples for the formulas behind our calculators.
- July 15, 2026 · 4 min
5 Percentage Tricks That Make Everyday Math Easier
Mental-math shortcuts for tips, discounts, and comparing prices — plus the two percentage formulas everyone should know.
- July 12, 2026 · 3 min
Metric vs Imperial: Quick Conversions You Can Do in Your Head
Approximate conversions between metric and imperial units that are close enough for daily life — plus a link to precise calculators.
- July 9, 2026 · 5 min
Compound Interest: Why Starting Early Beats Investing More
A worked comparison showing how time in the market — not amount invested — dominates long-term returns.
- July 5, 2026 · 4 min
BMI Explained: What It Measures, What It Misses
BMI is a useful screening tool but it isn't the whole story. Here's how it works, when it's misleading, and what to look at instead.
- July 2, 2026 · 5 min
How to Calculate a Mortgage Payment (with Formula)
Learn the exact formula behind monthly mortgage payments, walk through a worked example, and see how rate and term change what you pay.