Blog
Short, practical explanations of the formulas behind our calculators — written so you can check the numbers yourself.
How Mortgage Payments Work
Why your first mortgage payment is almost all interest, how amortization shifts over time, and what overpaying really saves.
2026-07-20 · 6 min read
HealthWhat Is BMI, and What It Cannot Tell You
BMI is a screening tool, not a diagnosis. Here is what the number means, where it works, and where it misleads.
2026-07-14 · 5 min read
FinanceCompound Interest Explained
Why the last decade of a savings plan usually produces more growth than the first two, and how to model it honestly.
2026-07-06 · 6 min read
RetirementA Practical Retirement Planning Guide
How much you need, what withdrawal rate is safe, and the three levers that actually move the outcome.
2026-06-28 · 8 min read
TaxesVAT Explained for Small Businesses
Adding tax, stripping tax, and the arithmetic error that quietly costs freelancers money on every invoice.
2026-06-19 · 5 min read
FinanceHow Inflation Affects Your Savings
Nominal returns flatter, real returns tell the truth. How to convert one into the other in a single step.
2026-06-10 · 4 min read