Apple - MacBook Air 13 M4 vs Apple - MacBook Air 15 M4
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - MacBook Air 13 M4 | Apple - MacBook Air 15 M4 |
|---|---|---|
| Storage | 256 GB | 512 GB |
| Battery | 53 Wh | 66 Wh |
| Screen size | 13.6 " | 15.3 " |
| Weight | 1.24 kg | 1.51 kg |
Between the MacBook Air 13 M4 and MacBook Air 15 M4, the MacBook Air 13 M4 comes out ahead in weight, while the MacBook Air 15 M4 wins on storage / battery. Overall, the MacBook Air 13 M4 scores 60.1 and the MacBook Air 15 M4 scores 63.3 on our Mars Score.
Which should you buy?
The MacBook Air 15 M4 edges ahead on the Mars Score (60.1 vs 63.3), but the 3.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the MacBook Air 13 M4 if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight. The single most decisive one: Weight — 0.27 kg less. 1.24 vs 1.51.
Pick the MacBook Air 15 M4 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are storage, battery, screen size. The single most decisive one: Storage — 100.00% more. 512 GB vs 256 GB.
Both ship with comparable ram, claimed battery life, refresh rate, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Apple - MacBook Air 13 M4 or Apple - MacBook Air 15 M4?
Apple - MacBook Air 15 M4 leads the current Mars Score by 3.2 points.The more useful decision is the trade-off behind that result: compare screen size, weight, battery against the way you will actually use the product.
Choose Apple - MacBook Air 13 M4 if…
Apple - MacBook Air 13 M4 has the measurable edge on weight kg.
Choose Apple - MacBook Air 15 M4 if…
Apple - MacBook Air 15 M4 has the measurable edge on storage gb, battery wh, screen size in.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Apple - MacBook Air 13 M4 wins
- ▲Weight — 0.27 kg less. 1.24 vs 1.51.
Why Apple - MacBook Air 15 M4 wins
- ▲Storage — 100.00% more. 512 GB vs 256 GB.
- ▲Battery — 24.53% more. 66 Wh vs 53 Wh.
- ▲Screen size — 12.50% more. 15.3 " vs 13.6 ".
Spec comparison
Design
| Spec | Apple - MacBook Air 13 M4 | Apple - MacBook Air 15 M4 |
|---|---|---|
| Weight | 1.24 kglead | 1.51 kg |
| Thickness | 11.3 mmlead | 11.5 mm |
| Build material | aluminum | aluminum |
| Backlit keyboard | true | true |
| Fingerprint reader | true | true |
Display
| Spec | Apple - MacBook Air 13 M4 | Apple - MacBook Air 15 M4 |
|---|---|---|
| Screen size | 13.6 " | 15.3 "lead |
| Refresh rateⓘ | 60 Hz | 60 Hz |
| Panel typeⓘ | IPS | IPS |
Performance
| Spec | Apple - MacBook Air 13 M4 | Apple - MacBook Air 15 M4 |
|---|---|---|
| CPU | Apple M4 | Apple M4 |
| CPU cores | 10 | 10 |
| GPUⓘ | Apple M4 10-core GPU | Apple M4 10-core GPU |
| RAMⓘ | 16 GB | 16 GB |
| Storageⓘ | 256 GB | 512 GBlead |
| Storage typeⓘ | SSD | SSD |
Battery & Ports
| Spec | Apple - MacBook Air 13 M4 | Apple - MacBook Air 15 M4 |
|---|---|---|
| Batteryⓘ | 53 Wh | 66 Whlead |
| Claimed battery life | 18 h | 18 h |
| USB-C portsⓘ | 2 | 2 |
| Thunderbolt portsⓘ | 2 | 2 |
| HDMI | false | false |
Frequently asked
Which has better battery life, MacBook Air 13 M4 or MacBook Air 15 M4?+
MacBook Air 15 M4 claims up to 18 hours — 18h vs 18h.
Which is lighter, MacBook Air 13 M4 or MacBook Air 15 M4?+
MacBook Air 13 M4 is lighter at 1.24 kg vs 1.51 kg.
Which has an OLED display, MacBook Air 13 M4 or MacBook Air 15 M4?+
Neither model has an OLED display.