How Far Does Bluetooth Reach? Not the Number You Were Told

Ten metres. That is the figure everyone repeats, and it is why people think their headphones are faulty when they cut out at the top of the stairs.

The organization that writes the Bluetooth specification gives a completely different answer, and it is not a single number at all.

I went and read what they publish, because the ten metre figure turns out to be a category of radio rather than a limit on what your devices can do.

The specification's own answer

One sentence, and it is nothing like ten metres.

On its range page, the Bluetooth SIG puts it this way: "The effective, reliable range between Bluetooth devices is anywhere from more than a kilometer down to less than a meter."

That spread is deliberate. The Bluetooth SIG describes the technology as designed "to support a wide range of achievable ranges between two devices."

Developers choose, and a fitness sensor and a warehouse tag want opposite things. So there is no Bluetooth range. There is only the range of your two devices.

The six things that actually decide it

Named by the SIG, and worth knowing because only two are about your devices' quality. Its list runs: "Radio Spectrum, PHY, Receiver Sensitivity, Transmit Power, Antenna Gain, Path Loss."

Transmit power is the one people assume is everything. Bluetooth "supports transmit powers from -20 dBm (0.01 mW) to +20 dBm (100 mW)", a ten thousand fold spread.

Receiver sensitivity is the quiet half. The Bluetooth SIG requires "a minimum receiver sensitivity of -70 dBm to -82 dBm, depending on the PHY used."

And path loss is your house. Walls, floors and bodies sit in that term, and no setting improves them.

Why real devices beat their own specification

The gap between the minimum and what gets built is large. The Bluetooth SIG says so outright: "Bluetooth implementations typically achieve much higher receiver sensitivity levels."

Its own example is striking. Average implementations of one low energy mode are "achieving a receiver sensitivity of -103 dBm." That is far beyond the -70 dBm floor.

I read it as better hearing, and hearing extends your range as surely as shouting does. Which is why two sets at the same price differ, and the box number was never the whole story.

So where did ten metres come from

It is real, but it is not what people think it is. It is a power class, not a promise, and classes group radios by transmit strength. The middle one is in most consumer gear.

A class is a design bracket. It describes the radio, not the room, and it assumes nothing is in the way. Manufacturers quote it because it is simple, and a kilometre to under a metre does not fit on a box.

Treat it as a forecast, not a thermometer. What you get depends on the pair and the path.

What shortens it in an ordinary house

Nothing exotic, and the biggest one is you. Your own body is a wall, and a phone in a back pocket transmits through the densest obstacle in the room.

Walls stack up fast. One plasterboard wall is nothing much. A wet brick wall or a steel-meshed floor is a great deal.

The 2.4 GHz band is shared. Wi-Fi, microwaves and other Bluetooth devices sit on it, and more traffic means more retries. Retries sound like stutter, not silence, and breaking up before it drops is congestion, not distance.

What this laptop has, and why it only tells you half

Ours, and it is the point people miss when they blame one device. One Bluetooth adapter is present here, a MediaTek radio, and that is one end of every connection this machine makes.

Range belongs to the pair, never to one radio. Good laptop plus poor earbuds gives you poor earbuds' range. So test with a second device, and if both pairs cut out in the same spot, the laptop is the common factor.

And if only one does, your laptop was never the problem. Pairing the second one properly is the first step in that test. I would do that before buying anything.

When it is not distance at all

Because a dropout at two metres is a different article. A connection that drops while you sit still is not range, and something is interrupting the link, not stretching it.

A device that disappears from the list entirely is a driver or a radio problem. Bluetooth vanishing from Windows has its own causes.

A device that will not connect at all never got as far as range. Pairing has an order, and it matters.

And stuttering audio that ignores distance is worth treating as a driver question. Reinstalling the radio's driver is the blunt version of that.

**Status: this one rests on the Bluetooth SIG's published material on range, read 18 September 2026, read in full, with the adapter reading taken here on a Home install of 25H2.

No range was measured here, no distance was paced out, and no device was tested at the edge of its reach.**

How far does Bluetooth actually reach?

There is no single answer. The Bluetooth SIG says effective reliable range runs from more than a kilometre down to less than a metre, depending on six factors including transmit power, receiver sensitivity and path loss.

The ten metre figure is a power class, not a limit.

Why do my Bluetooth headphones cut out in another room?

Path loss, which is the SIG's own term for what the building does to the signal. Walls, floors and your own body all sit in it. A phone in a back pocket is transmitting through you before it reaches anything else.

Does a more expensive Bluetooth device have longer range?

Sometimes, and not for the reason you would guess.

The SIG notes that real implementations usually achieve far better receiver sensitivity than the specification requires, and better hearing extends range as much as stronger transmitting does.

Is Bluetooth range the same as the class 1 and class 2 numbers?

No. Those classes describe how hard a radio transmits, in open air with nothing in the way. They are a design bracket rather than a distance you will get, and the SIG's own published answer is a range rather than a figure.

The Short Version

• The Bluetooth SIG says reliable range runs from over a kilometre to under a metre.
• Ten metres is a power class, not a limit written into the specification.
• Six things decide it, including receiver sensitivity and path loss, not just transmit power.
• Transmit power alone spans a ten thousand fold range across Bluetooth devices.
• Real devices usually hear far better than the specification requires, which extends range.
• Your own body is one of the worst obstacles in a normal house.
• Stuttering rather than dropping is usually congestion on the 2.4 GHz band.
• Range belongs to the pair of devices, so test with a second one before blaming either.

Where to Next

The congestion mentioned above has exact numbers behind it, and the band Bluetooth uses explains the microwave too.

Stop judging your headphones against ten metres, because that number was never a promise. Test the same walk with a second device, since range is a property of the pair rather than of one radio.

Move the phone out of your back pocket before you conclude anything, because you are the obstacle. And if the connection breaks up while you sit still, treat it as interference or a driver rather than distance.

If yours cuts out at a distance that makes no sense, say what the two devices are and where you were standing in the comments. The pairing and the walls usually explain it between them.