Performance basics
How far should perfume project
Perfume has no universal required projection distance. Appropriate noticeability depends on the product, application, environment and occasion, and a larger surrounding presence is not automatically better.
A HUME Fragrance buying guide

Choose the social setting
Follow fragrance-free policies and consider shared rooms. A scent intended for personal enjoyment does not need to be noticed across a room to be successful.
Describe rather than invent meters
An observation at normal interaction distance is useful context, but not a fixed product radius. Airflow and movement make simple distance claims difficult to generalize.
Keep duration separate
Projection can become quieter while a scent remains up close. Decide whether that later experience fits your purpose rather than treating it as automatic failure.
Try this before you buy
Describe your desired presence using your real setting before comparing product claims about strength.