“Twice a year.”
That’s the answer most piano manufacturers give, and it’s not wrong. But it’s a little like answering “how often should you water a plant?” with “once a week.” The real answer depends on your piano, your room, and your ears. And understanding why will tell you something genuinely interesting about what tuning actually is.
The physics of going out of tune
A piano has about 230 strings, each under enormous tension — roughly 160 to 200 pounds per string. Together, they pull against the piano’s cast iron plate with a combined force of around 20 tons. That enormous tension is what allows a piano to project its sound with such volume and power.
The problem is that tension isn’t stable. It’s responsive to its environment, always shifting in response to changes in humidity and temperature. Of the two, humidity is the main culprit. The piano’s soundboard — the large spruce panel that amplifies the strings’ vibration into the room — absorbs moisture in damp conditions, and releases it when the air is dry. As it does this, it swells and shrinks. The strings move with it, which changes their tension. And any change in tension means a change in pitch.
This is why a piano goes out of tune — even when nobody plays it. It isn’t about wear and tear — it’s physics. The changing air around the piano is constantly nudging it away from where the tuner left it. A piano tuning is a bit like an ice sculpture; it very subtly starts to melt before it’s even finished.
So how often, really?
Twice a year is a reasonable baseline, since it loosely tracks the two major seasonal humidity swings most climates experience. But the right answer varies considerably depending on your situation.
The single biggest factor is the climate of the room your piano lives in. In the Pacific Northwest, we’re fortunate to have relatively moderate seasonal swings compared to somewhere like the Midwest or the Northeast — but that doesn’t tell the whole story. What matters more is what’s happening inside your home: whether you’re running forced-air heat, how well your house holds humidity through the winter, whether the piano sits near a heating/cooling vent, an exterior wall, or a door. Two pianos in the same local area can have very different climate experiences. A piano in a humidity-controlled space will drift far less than one sitting next to a drafty window. Without control, twice a year may not be enough. With it, once a year often is.
One of the most effective things you can do, regardless of your local climate, is install a humidity control system directly in the piano. Systems like the Piano Life Saver — made by Dampp-Chaser — mount inside the cabinet and work to keep the relative humidity around the soundboard steady year-round, typically near 45%. A piano with one of these installed drifts far less between tunings. The wood and glue joints that hold the instrument together benefit too. It’s an investment that pays for itself in reduced tuning frequency, increased musical enjoyment, and the long-term health of the instrument.
New pianos need special treatment
New pianos are a special case. In the first two or three years of a piano’s life, the strings are still stretching and settling under tension. New pianos go out of tune faster and benefit from more frequent tuning — some manufacturers recommend three or four times in the first year. Each tuning helps the strings seat a little more, and over time the piano stabilizes.
Moving also disrupts a piano. Even a short move introduces jostling and, almost inevitably, a climate change. Always tune after a move, regardless of when it was last done.
How bad does it sound to you?
There’s another variable that doesn’t get enough attention: musical tolerance. How much does it bother you when your piano isn’t perfectly in tune?
This varies enormously from person to person — and neither end of the spectrum is wrong. A professional musician or serious student might feel the drift within a few months and find it distracting. A casual player who sits down on Sunday afternoons might not notice until the piano is quite significantly out of tune. Some people even prefer a slightly out of tune piano! All of them have different valid answers to “how often should I tune my piano?”
It’s best to think of tuning as a service to your musical experience, not an obligation to the piano itself.
One exception worth noting: young students benefit immensely from a well-tuned instrument, since their ears are still developing a sense of pitch. They might not be able to tell you that the piano sounds off — they just quietly absorb whatever they’re hearing.
Why regular tuning pays off
That said, there is a genuine argument for staying consistent — one that goes beyond the immediate pleasure of a well-pitched piano.
A piano tuned frequently throughout its lifetime tends to be more stable between tunings. The strings, tuning pins, and soundboard settle around the correct tension over time. In a sense, the piano becomes habituated to being in tune. When it drifts, it doesn’t go as far, and it comes back more easily. Consistent tuning is one of the better long-term investments you can make in the instrument.
Tuning isn’t the same as maintenance
Here’s something that surprises many piano owners: a piano that is tuned every six months but never otherwise serviced is not a well-maintained piano.
Tuning addresses pitch — the frequency at which each string vibrates. It does nothing for the mechanical action, the roughly ten thousand moving parts that translate the movement of your fingers into sound. That work belongs to regulation: the precise adjustment of the friction, alignment, and timing of all these moving parts. A well-regulated piano feels effortless; a piano severely out of regulation feels terrible to play even if it’s perfectly tuned.
Tuning also doesn’t address the tone of the instrument. The properties of the piano’s hammers — their shape, whether they are soft or hard, springy or not — determine whether the piano sounds bright or mellow, harsh and unpleasant, or sweet and pleasing. The process of manipulating the hammers to achieve better tone is called voicing. And again, a piano that is severely in need of voicing work will not be musically satisfying even if the tuning is perfect.
Think of tuning like keeping a car’s tires inflated: necessary, and something you’d definitely notice without, but not a replacement for maintaining the engine and suspension.
A good mechanic doesn’t just check the tires — and I try not to either. That’s why I always try to spend a bit of time on every visit attending to regulation, voicing, and any sticking keys or other minor repairs that might come up.
What happens when a piano hasn’t been tuned in years
A piano that goes years without attention will almost always drop in pitch — sometimes dramatically. String tension gradually relaxes, and each cycle of seasonal humidity pushes it a little further flat. Eventually the piano can be a half step or more below A440, the international pitch standard.
Bringing a piano back from this state requires extra time and attention: what’s called a pitch raise or pitch correction. This involves two or even three passes of tuning to restore it to where it should be.
The reason for these extra steps has to do with the extreme tension of the piano strings that we already mentioned. A piano’s strings don’t act independently; they all bear down on the soundboard, which flexes slightly in response to their combined load. When you raise the tension on one section of strings, it shifts the balance of forces on the soundboard, which in turn changes the tension on every other string. From the tuner’s point of view: the strings you just tuned are no longer where you left them.
This is the circular difficulty at the heart of a pitch raise: you can’t do it in a single pass, because adjusting anything changes everything else. So you work in rounds — a rough raise first, then a full fine tuning, sometimes a third pass weeks later after things have had a chance to settle. It’s a process of converging on the target, not landing it in one shot.
This is why pitch raises take more time and may require a follow-up visit — it’s a process of patience, not a single fix.
The practical answer
So: how often should you tune your piano?
Twice a year is a good default — once in the spring as humidity rises, once in the fall as the heating season dries things out. More often if you’re a serious player, if your room climate is unstable, or if your piano is new. Less often is defensible if you have good humidity control and a tolerant ear — but once a year should really be the minimum. Beyond that, you risk drifting into pitch-raise territory, and with it the long-term instability that comes from strings and pins that have lost their footing.
If you’re not sure what schedule makes sense for your specific piano and room, I’m happy to chat and give you a straightforward recommendation. No two instruments — or homes — are quite alike.