How loud is too loud? Decibels, dose and why time matters

“Is that too loud?” is one of the most common questions parents ask, and one of the hardest to answer from across the room. The honest answer is: it depends on how loud, and for how long. This post explains both halves in plain words, so you can make sense of the numbers you see in apps, on your phone and in the news.

Decibels in one minute

Sound level is measured in decibels (dB). The scale is logarithmic, which means it doesn't grow the way everyday numbers do. Every 10 dB step is ten times more sound energy, and our ears perceive it as roughly twice as loud. Every 3 dB step doubles the sound energy, even though it barely sounds different.

That last point matters most for hearing. Going from 80 to 83 dB feels like a small nudge of the volume button, but it delivers twice the energy to the inner ear. Going from 80 to 90 dB delivers ten times as much.

For headphones, the level that counts is the level at the ear. The same volume setting can produce quite different levels on different earbuds, and a loudly mastered song is louder than a quiet podcast at the same setting. That is why a percentage on the volume slider is only a rough guide.

Why time matters as much as volume

Inside the inner ear are tiny sensory hair cells that turn vibrations into nerve signals. Loud sound tires them out. After a while they recover, which is why ears can ring or feel dull after a concert and be fine the next day. But repeated or prolonged overload can damage them permanently, and in humans they don't grow back. The World Health Organization describes noise-induced hearing loss as permanent but preventable.

What the ear experiences is a dose: the amount of sound energy over time. A moderate level for a long time and a high level for a short time can add up to the same dose. This is the idea behind the safe-listening standard that the WHO and the International Telecommunication Union published together, ITU-T H.870.

The weekly listening budget

H.870 doesn't give a single “safe volume”. It describes a weekly budget of sound energy, measured over seven days:

• Adults: the energy of 80 dB for 40 hours a week.
• Children and sensitive listeners: the energy of 75 dB for 40 hours a week.

Because of the 3 dB rule, the budget runs out faster as the level rises. For an adult, 83 dB uses up the week's budget in about 20 hours, 86 dB in about 10 hours, and every further 3 dB halves the time again. Listening quietly, on the other hand, barely touches the budget at all.

This is a much more useful way to think than “loud is bad”. It means a teenager who listens for hours at a modest level may be doing fine, while one who listens for a shorter time with the volume near the top may use up the week in two days.

What this looks like in everyday life

The biggest risk is rarely a single loud moment. It is the volume creeping up in noisy places. On a bus, a train or a busy street, background noise masks the music, so people turn it up to compensate, often without noticing. Commutes, long gaming sessions and falling asleep with earbuds in are the typical situations where the dose builds up quietly.

Some signs that listening is too loud, right now:

• Someone next to the listener can clearly hear the music.
• The listener can't hear you speaking at a normal volume from an arm's length away.
• Ears ring, buzz or feel muffled afterwards.

Simple habits that keep the dose low

The WHO's Make Listening Safe initiative recommends a handful of habits that make a real difference:

• Keep the volume down, especially in noisy places. If you have to turn it up to hear over the noise, it is time for a break instead.
• Use well-fitting earbuds, ideally with noise cancellation. When the outside noise is blocked, you don't need to turn the music up to hear it.
• Take listening breaks. Ears recover better with quiet time in between.
• Limit time in loud places such as concerts, and protect your ears there.
• Use the tools you have. iOS can reduce loud headphone audio automatically (Settings → Sounds & Haptics → Headphone Safety), and apps can track your weekly dose.
• Take warning signs seriously. Ringing or muffled hearing that doesn't go away within a day is a reason to talk to a doctor.

How Earbunny uses this

Earbunny shows the listening level at the ear, labelled “measured” when it comes from Apple Health and “estimated” when it is calculated from the volume and the headphone model. It adds up the weekly dose against the H.870 budget and gives a gentle heads-up at 50%, 80% and 100%. We explain every formula on our How we measure page.

No app can tell you whether someone's hearing is healthy; only a hearing professional can. What an app can do is make the invisible visible, so that “turn it down” becomes a shared number instead of an argument. For more practical tips, read our parents' guide.