Don't calibrate your MacBook Air battery.

Don’t bother.

Modern MacBooks (2010 or later) use lithium-ion batteries with built-in fuel gauge circuitry. They track charge state continuously. The old “calibrate monthly” advice came from nickel-cadmium batteries that had memory effect. Those days are gone.

Apple still says you can do a full charge cycle (100% to dead to 100%) every few months if you notice the battery percentage acting flaky. That’s not a calibration—it’s just letting the gauge re-sync. But unless you’re seeing weird behavior like the laptop dying at 15%, you don’t need it.

If you want to be thorough, do one full cycle after a macOS update or if you haven’t drained the battery in months. Otherwise, plug it in when you feel like it and stop worrying.