MacBook Air (M5, 13-inch / 15-inch) charging wattage
Apple lists a 30W minimum charger output for the 13-inch M5 model and 35W for the 15-inch M5 model. Apple lists 70W or higher for the advertised fast-charge result on either size.
30W, 35W or 70W: which MacBook Air M5 charger?
Apple's MacBook Air tech specs list the minimum wattage required to charge each M5 size, plus a separate 70W threshold for fast charging. Match the output of the port you actually use to the row below.
| Charger port output | 13-inch M5 | 15-inch M5 | What to expect |
|---|---|---|---|
| 30W | Charges · Apple minimum | Below Apple minimum | Slower charging on the 13-inch; not enough for the 15-inch. |
| 35W Dual USB-C | Charges | Charges · Apple minimum | Apple configure-to-order adapter. Using both ports shares the 35W, so each port can get less. |
| 40W Dynamic (60W Max) | Charges | Charges | In the box in some regions, such as the US. Still below the 70W fast-charge threshold. |
| 70W or higher, USB PD | Fast charge | Fast charge | Apple: fast-charge capable with a 70W or higher USB PD power source, if the cable and port can carry it. |
In the UK and EU, Apple sells the M5 MacBook Air with the power adapter sold separately, so a charger you already own decides which row applies. Check it before buying another one.
What charger should you use?
For the simplest setup, choose a standards-compliant USB-C charger whose relevant port can provide at least 70W when you want to meet this preset’s fast-charge / supply reference, then use a cable rated for the same path capacity. A larger charger is normally fine with standards-compliant USB-C charging because the device negotiates what it uses.
What happens below the target?
The 13-inch M5 model has a manufacturer-published 30W minimum charger output; the 15-inch model has a 35W minimum. Between the relevant minimum and the 70W fast-charge supply reference, charging may work without the advertised fastest result. WattageFit does not invent a workload drain threshold.
Why the cable and port still matter
A charger brick's total rating does not guarantee the same power on every port. WattageFit compares the remaining shared charger budget, selected port limit, cable rating and preset target. The reported wattage is available path capacity — not a live measurement of what the device is actually drawing.
Primary source
Preset reviewed against Apple — MacBook Air Tech Specs ↗, MacBook Air (13-inch, M5) Tech Specs ↗ and MacBook Air (15-inch, M5) Tech Specs ↗.
Last reviewed October 21, 2026. Published manufacturer thresholds are source-backed where labeled; when a minimum or workload threshold is not published, WattageFit leaves it unknown rather than inventing one. WattageFit does not measure live negotiated power.