This still works for Apple Silicon based Macs: [Wayback/Archive] How can I tell what wattage my MacBook Pr… – Apple Community
TL;DR:
- Either:
- ⌘-space -> System Information.app
- menu -> About This Mac -> More Info… -> System Report…
Note that “System Report…” starts the “System Information.app” (how cool would naming consistency be…)
- Hardware -> Power
- Browse down to “AC Charger Information”
On my M1 MacBook Pro, the values depend on the charging ports used:






