Blog & Guides
Deep guides for people who want to understand, not just calculate. Content written by humans, reviewed by specialists, updated regularly.
How compound interest works: a complete guide with examples
Understand what Einstein called the eighth wonder of the world. Formula, worked examples, comparison with simple interest, and practical strategies for investors.
Gross vs net salary: how to compare job offers across countries
How to translate gross to net across the US, UK, Brazil, and Spain. Tax tables, social security and the hidden differences that matter when negotiating offers.
BMI vs body fat percentage: which one should you actually use?
BMI is simple but has well-known limitations. See when it fails, how body fat percentage complements it, and which measurement methods are worth your time.
Fixed rate vs variable rate mortgage: how to decide and run the numbers
How to actually evaluate fixed vs variable mortgages with concrete numbers. Sensitivity analysis, break-even rates, and rules of thumb that survive contact with reality.