Blog category
3=posts
Currencies, compound interest, mortgages, inflation, taxes. Every formula verified against the canonical source.
Finance
- fuelmpgcost
Cost per kilometre — the only fuel number worth tracking
Marketed MPG, L/100km on the trip computer, the price at the pump. Why none of them help you plan trips, and the one number that does.
5 min readRead - floating pointfinancejavascript
Why 0.1 + 0.2 !== 0.3 (and what to do with money)
IEEE-754 explained in 500 words, why every language does this, and the three correct ways to handle currency.
4 min readRead - compound interestfinancesavings
Compound interest explained with 5 worked examples
The formula, the intuition, the difference monthly vs yearly compounding makes, and why time matters more than rate.
6 min readRead