Guides
Guides for percentages and dates
Short explanations that go with the tools, written to fix the problem you came with.
Percentage formulas explained: of, is-what-percent and percent change
The formulas, worked examples, and the mistakes that trip people up.
Read guide →How to count days between dates: inclusive, exclusive and working days
Inclusive vs exclusive counting, month lengths, leap years and working days.
Read guide →