Haru Tools
A little context

Useful guides

Real examples. Clear assumptions. Fewer surprises.

01

Percentage vs Percentage Points: Choose the Right Comparison

Understand the baseline behind a percentage, compare rates correctly, and avoid adding stacked discounts.

02

How to Count Days Between Dates Without an Off-by-One Error

Choose elapsed or inclusive counting, understand calendar-day offsets, and keep dates separate from timestamps.

03

Characters, Words, and Bytes: Why Text Counts Disagree

Learn what grapheme clusters, whitespace-separated word groups, line counts, and UTF-8 bytes actually measure.

04

How to Compare Unit Prices When Package Sizes Differ

Normalize grams, kilograms, millilitres, and litres to compare equivalent quantities and spot misleading package comparisons.