Are AirPods 3 And 4 The Same Size? | Fit And Case Differences

When people ask about size, they’re usually trying to avoid two annoyances: earbuds that don’t sit the same, and a new case that won’t work with a favorite cover, dock, or pocket.

This article breaks size down into what matters in daily use: the official measurements, what those numbers mean for feel, and a few quick checks you can run before committing.

What “Same Size” Means With AirPods

“Same size” can mean different things, so it helps to name the parts:

• Earbud dimensions: the height/width/depth of the earbud body.
• Charging case dimensions: the outer size of the case in your pocket or bag.
• Fit geometry: where the curves touch your ear and how the stem angle sits.

Specs describe a bounding box. Your ear feels contours and pressure points. So the numbers answer “will it fit,” while fit geometry answers “will I like it.”

Are AirPods 3 And 4 The Same Size? What The Numbers Say

Apple publishes the size and weight for each model. Here’s the clean comparison, using the values from Apple’s spec pages.

Earbud Dimensions Compared

AirPods (3rd generation) earbuds measure 30.79 mm tall, 18.26 mm wide, and 19.21 mm deep, with a weight of 4.28 g each. AirPods 4 earbuds measure 30.2 mm tall, 18.3 mm wide, and 18.1 mm deep, with a weight of 4.3 g each, per Apple’s AirPods 4 technical specifications and the AirPods (3rd generation) spec page.

That means AirPods 4 are a touch shorter and less deep. Width is almost the same. In hand, they look like close relatives, not twins.

Charging Case Dimensions Compared

The charging cases are where you see a clearer split. AirPods (3rd generation) case measurements are 46.40 mm tall, 54.40 mm wide, and 21.38 mm deep. AirPods 4 case measurements are 46.2 mm tall, 50.1 mm wide, and 21.2 mm deep, from Apple’s AirPods (3rd generation) technical specifications and the AirPods 4 spec page.

Height and depth stay in the same range. Width drops by over 4 mm on AirPods 4, which is enough to affect rigid accessories and tight pockets.

What The Size Shift Feels Like In Real Use

You won’t feel a one-millimeter spec change the same way you’d feel a new shoe size. Still, small shifts can change comfort and stability because open earbuds rest on a few contact points.

Earbuds: Size Is Close, Shape Does The Heavy Lifting

AirPods 3 and AirPods 4 are close in published dimensions. Comfort differences come more from shape: the curve of the bulb, the stem angle, and where the weight sits against your ear.

If AirPods 3 already feel perfect, AirPods 4 are likely to land in the same comfort zone for many listeners. If AirPods 3 feel borderline—fine at a desk, loose on walks—AirPods 4 can swing either way, since the fit geometry is not identical.

Charging Case: Width Is The Part People Notice

The case is the object you handle each time you listen. A narrower case can sit flatter in slim jeans pockets, smaller sling bags, and tight tech pouches. It can also feel nicer in the hand if you carry it during calls.

If you store your case in a molded organizer or a fixed slot, width is the spec that decides whether it seats cleanly.

Fit Signals To Watch During A Try-On

If you can try AirPods 4 in person, give yourself more than a two-minute demo. Small fit issues show up when you talk, chew, and move.

• Jaw test: talk for a few minutes, then chew. Watch for stem rub or shifting.
• Head-turn test: look left and right, then down, then up. Check whether one side loosens.
• Pressure check: note any hotspot where the bulb presses inside the ear.

If it feels natural after twenty minutes, that’s a good sign. If it feels annoying in the first twenty minutes, it rarely turns into a favorite over time.

Table: AirPods 3 Vs AirPods 4 Size And Carry Specs

This table puts the main numbers in one spot, so you can judge interchangeability at a glance.

Will AirPods 3 Cases And Covers Fit AirPods 4

In most cases, no. Even if the earbuds look similar, the charging case is a different shape and width. A molded hard shell made for AirPods 3 won’t line up well with AirPods 4. Hinges, LEDs, and charging cutouts can miss by enough to feel sloppy.

Soft silicone sleeves can stretch, yet the fit can still look off, and the lid may not open and close as smoothly if the sleeve is under tension. If you like a snug, clean fit, buy a cover labeled for your exact model.

Desk Docks And Charging Stands

Docks that rely on a tight cradle are sensitive to small changes. If you use a desk dock daily, check its model list before you upgrade. If it was designed around AirPods 3, AirPods 4 may sit loose or not seat fully.

Cable Routine: USB-C Vs Lightning

AirPods 4 uses a USB-C charging case. Many AirPods 3 units in the wild use Lightning. That doesn’t change physical size, yet it does change what “fits” your daily setup—car cable, travel cable, bedside cable.

Pocket And Bag Reality Checks

Most pockets care about two things: width and the hinge edge. Since AirPods 4 trims width, it can feel smoother in slim pockets and smaller pouches. If you clip your case to a bag, the lighter AirPods 4 case can bounce a bit less.

Tech Organizer Slots

Hard organizers with shaped slots are where “close” can still feel a little off. A wider slot meant for AirPods 3 can let AirPods 4 rattle. If you hate rattle, add a thin sleeve or pick a pouch with a flexible pocket.

Carrying With Metal Items Or Coins

If your case shares space with metal items, a narrower case can reduce constant rubbing. That helps keep the case looking cleaner, since the glossy plastic shows scuffs fast.

Buying Choices When Size Is Your Main Concern

Size questions often hide a bigger decision: you want the comfort you already have, plus a case that matches your carry style.

If AirPods 3 Feel Great Today

AirPods 4 are close in overall earbud size. Many people who like AirPods 3 won’t hit a sudden discomfort just from the size change. Still, the safe move is to test them during normal movement, not only seated.

If AirPods 3 Feel Loose

Loose fit is often about angle and contact points. AirPods 4 might grip better for you, or it might slip in a different way. If you plan to use them on walks or in the gym, buy from a seller with a straightforward return policy so you can test without guessing.

If AirPods 3 Create A Hotspot

A hotspot is a pressure point inside the ear that builds over time. In that case, even small contour changes can matter. Try to wear AirPods 4 for at least twenty minutes, with talking and chewing, so you can feel whether that hotspot shows up.

Table: Fast Checks To Decide If The Differences Matter

Use this table as a quick filter for your own setup.

A Simple One-Hour Test That Covers Most Risks

If you’re on the fence, run this quick test the day you get them:

1. Seat and talk: take a five-minute call and note stem rub or pressure.
2. Walk test: take a ten-minute walk with head turns and stairs.
3. Carry test: keep the case in your usual pocket or pouch for the same trip you do most days.

That one hour answers the size question in the way specs can’t: it tells you whether they fit your ear and your routine.

Final Take: Close In Earbud Size, Not Interchangeable In Cases

AirPods 3 and AirPods 4 are close in earbud dimensions, so they sit in the same design lane. Still, they are not the same size across the full set of measurements. The charging case shift—mainly width—means accessories and covers should be treated as model-specific.

If your goal is “will they feel the same,” let a short try-on decide. If your goal is “will my AirPods 3 case cover and dock still fit,” plan on replacing those pieces with AirPods 4 versions.

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