When percent is enough
Use percent for broad comparisons and everyday communication where small precision differences are not critical.
Guide
Permille Vs Percent
Percent is out of 100. Permille is out of 1,000. The right choice depends on the precision and convention of your domain.
When permille is better
Use permille for fine-grained change, concentrations, slope, rates, or compliance thresholds where 0.1% steps matter.
Examples
- 0.5% = 5‰
- 2.7% = 27‰
- 90% = 900‰