Tooleem
Guides
Worked examples, reference tables and the rules behind the numbers. Each guide answers a question our tools leave open, cites its sources and links to the tool that does the calculation.
Finance2
Markup vs Margin: Formulas and a Two-Way Conversion Table
The difference between markup and margin, both conversion formulas, two-way tables from 5% to 300%, pricing for a target margin and the mistakes that cost money.
The Rule of 72: How Accurate Is It?
How the Rule of 72 estimates doubling time, why 72 works, an accuracy table against the exact answer from 1% to 30%, and the rules of 70 and 69.3.