Is My Mac Getting Enough Power From My Charger?
Answer in 30 seconds: Your Mac is getting enough power if your charger and cable can supply what your current workload draws — at idle or light use, that's often well below your model's included adapter wattage, so a lower-rated charger can still work fine. Check System Information > Power for a stable or climbing wattage with no "Not Charging" state.
If your battery holds steady or drops while you're running heavy tasks — video export, compiling, gaming — even though a charger is plugged in, the charger and cable together aren't supplying enough power for what your Mac is doing at that moment.
Charger and cable specs don't tell the whole story on their own — a high-wattage charger paired with a low-rated cable behaves like a low-wattage charger, and a charger that's fine at idle can fall short under real load. Work through the four checks below in order to find out where you actually stand.
The decision tree
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1. What's your Mac model's charging wattage?
Check the Apple menu → About This Mac for your exact model, then compare it against the current models in the table below. That's the wattage Apple bundles for full-speed charging — it's not a hard floor. A MacBook Air draws very little power at idle or during light use, so a lower-wattage charger (even a 20W USB-C adapter) will often keep it charged just fine. The gap only shows up under sustained heavy load, where the Mac draws more than a smaller charger can supply.
→ Charger well below the table wattage for your model, and you're seeing charge loss under heavy use? Skip to "Not enough power." -
2. Is your charger rated at or above that wattage?
The wattage is printed on the charger body (e.g. "61W", "96W", "140W"). If you're not sure which charger you own, WattsConnected reads it directly from what your Mac has negotiated.
→ Charger wattage is at or above the table value for your model? Continue to the cable check. (A lower-wattage charger can still work fine for idle and light use — see "The three outcomes" below.) -
3. Is your cable rated to carry that wattage?
USB-C cables cap the connection at their own rating regardless of what the charger can output. Thin charge-only cables are often limited to 60W even when plugged into a 96W or 140W charger.
→ Cable rated below the charger? That's your bottleneck — the fix is a higher-rated cable, not a new charger. -
4. What does macOS actually show under load?
Open System Information → Power and look at the negotiated wattage while running a demanding task. If it's close to your charger's rating and the battery climbs (or holds near 100%), you're covered. If it's noticeably lower, or the battery drains under load, something upstream — charger, cable, or a shared multi-port charger — is limiting you.
→ Negotiated wattage matches expectations and the battery isn't draining under load: you have enough power. Otherwise: borderline or not enough — see below.
The three outcomes
Enough power: your charger and cable can supply what your current workload draws, and System Information confirms a stable or climbing wattage. This includes lower-wattage chargers during idle or light use — no action needed.
Borderline: your charger keeps up at idle and light use but not under the fast-charge threshold, or it's a multi-port charger sharing wattage with another device. You'll charge, just slower than the model is capable of.
Not enough power: the negotiated wattage under sustained heavy load is well below what your Mac is drawing, and the battery holds steady or loses charge while plugged in. This is a workload problem, not necessarily a "wrong charger for this model" problem — the same charger may be perfectly fine for browsing and email.
Charging wattage by MacBook model
| Model | Included adapter | Fast-charge adapter |
|---|---|---|
| MacBook Air 13"/15" (M4) | 30–35W | Not fast-charge capable |
| MacBook Air 13"/15" (M5) | 40W | Not fast-charge capable |
| MacBook Pro 14" (base chip) | 67–70W | 96W+ for fast charge |
| MacBook Pro 14" (Pro/Max chip) | 96W | 140W for fast charge |
| MacBook Pro 16" | 96–140W | 140W for fast charge |
These are the adapters Apple includes for full-speed charging — not the minimum wattage needed to charge at all. Any compatible 20W+ USB-C charger will charge these models during normal, light use; you'll only notice the gap under sustained heavy load. Adapter wattage also varies by configuration and year — confirm your exact model under About This Mac before assuming a table row applies. Fast charging on Pro/Max models also requires a compatible USB-C to MagSafe 3 cable, not just a higher-wattage adapter.
Don't see your model listed? This table covers the current lineup, not every Mac Apple has ever sold. Check the wattage printed on the power adapter that came with your Mac — that's your baseline — or use WattsConnected to see exactly what your Mac is negotiating regardless of model.
The fastest way to check
Manually working through this tree means opening System Information, checking a charger's printed wattage, and sometimes swapping cables to isolate the bottleneck. WattsConnected does steps 2–4 automatically: it shows the max wattage your charger has actually negotiated with your Mac right in the menu bar, flags when a cable is capping a charger that's capable of more, and warns you the moment a charger can't keep up with what your Mac is drawing.
Frequently asked questions
Is my Mac getting enough power from my charger?
Your Mac is getting enough power if the charger and cable can supply what your current workload needs and System Information > Power shows a stable or climbing wattage. At idle or light use, that's often well below your model's included adapter wattage — the wattage table by model is Apple's included and fast-charge adapter, not a strict floor. If your Mac loses charge while under heavy use, the charger is undersized for that workload.
What happens if my charger is underpowered for my Mac?
An underpowered charger will still charge your Mac at idle or light use, but the battery percentage can hold steady or drop during heavy workloads like video export or compiling, because the Mac is drawing more power than the charger and cable can supply.
Does a higher-wattage charger charge my Mac faster if my cable is low-rated?
No. The cable caps the connection at its own rating regardless of the charger's output. A 140W charger paired with a 60W-rated cable will negotiate at 60W or lower, not 140W.
See also: Why Is My Mac Charging Slowly? and USB-C Power Delivery Explained.