Cats can hear remarkably high frequencies, up to about 85,000 Hz (85 kHz) at moderate sound levels. That’s roughly four times higher than the human limit of 20 kHz, giving cats one of the broadest hearing ranges among all mammals. Their range extends from a low of 48 Hz up to that 85 kHz ceiling, meaning they pick up deep rumbles and ultrasonic squeaks alike.
How Cat Hearing Compares to Yours
Human hearing tops out around 20 kHz, and that number drops with age. Dogs can detect sounds up to roughly 45 kHz. Cats surpass both by a wide margin, nearly doubling the dog’s upper limit. At the low end, cats and humans are closer together: cats hear down to about 48 Hz, while humans can detect tones as low as 20 Hz. The real gap is at the top of the range, where cats operate in a sonic world completely invisible to human ears.
To put this in perspective, the highest note on a piano is about 4 kHz. A dog whistle typically sits between 23 and 54 kHz. A cat can hear well beyond even that.
Why Cats Evolved Ultrasonic Hearing
The answer is mice and rats. Rodents communicate using ultrasonic vocalizations that fall into two broad categories: calls around 22 kHz (spanning roughly 20 to 45 kHz) and higher-pitched calls around 50 kHz (reaching up to 64 kHz or beyond). These squeaks are completely inaudible to humans, but they land squarely in a cat’s best hearing range. A hunting cat can detect the alarm calls, social chatter, and distress signals of prey animals that think they’re communicating in secret.
This isn’t a coincidence. Cats evolved as small-prey specialists, and the ability to hear ultrasonic rodent vocalizations gave them a significant hunting advantage, particularly in low-light conditions where vision alone isn’t enough. Interestingly, researchers have suggested that rodents may have shifted their communication into ultrasonic ranges partly to avoid detection by predators, but cats (and some other predators) evolved to follow them there.
How Their Ears Pinpoint Sound
A cat’s external ear, the tall triangular structure called the pinna, acts like a funnel that captures and amplifies sound waves. Each ear can move independently, rotating up to about 20 degrees to zero in on a noise. This rotation happens in two stages: a fast, reflexive movement triggered within milliseconds of hearing a sound, followed by a larger, slower adjustment as the cat turns toward the source.
That rapid first movement does something clever. By shifting the ear’s position quickly, the cat effectively takes multiple “samples” of the same sound from slightly different angles. This helps the brain separate the sound itself from the way the ear’s shape filters it, producing a sharper picture of exactly where the noise came from. The second, larger movement then aims the ear like a satellite dish, improving the signal-to-noise ratio by focusing the ear’s most sensitive axis directly at the source. High-frequency sounds are especially easy to localize this way because their short wavelengths interact more precisely with the ear’s shape.
Sounds in Your Home That Only Your Cat Hears
Your house is noisier than you think, at least from your cat’s perspective. Electronics like LED bulbs, LCD televisions, chargers, and other devices emit ultrasonic noise that’s completely silent to you but well within feline range. Testing has shown that an LCD TV, even with nothing playing on it, produces significant ultrasonic signatures. LED light bulbs are another notable source. These sounds are a kind of electronic pollution that only your pets experience.
Ultrasonic pest repellers are a common concern for cat owners. These devices emit high-frequency tones (above 20 kHz) designed to drive away rodents, and cats can absolutely hear them. At low intensities, most cats seem unbothered, likely because their hunting instincts have wired them to tolerate high-frequency sounds rather than flee from them. But louder devices or poorly placed ones can cause stress. Signs to watch for include hiding or avoiding the area near the device, decreased appetite, excessive grooming, increased clinginess, inappropriate scratching, and visible agitation or aggression.
If you use ultrasonic devices at home, placing them away from areas where your cat sleeps or spends most of its time can help. Similarly, keeping media equipment in a closet or separate room reduces the ultrasonic background noise your cat lives with daily.
High-Frequency Hearing Loss With Age
Like humans, cats gradually lose their ability to hear high frequencies as they get older. This condition, called presbycusis, typically begins in the last third of a cat’s expected lifespan. For most indoor cats, that means noticeable changes could start around age 10 to 12. The highest frequencies go first, then hearing progressively fades across the full range. In cats that live long enough, presbycusis can eventually lead to near-total deafness.
The signs are often subtle at first. A cat that once reacted to the faint rustle of a treat bag from three rooms away may stop responding. You might notice your cat sleeping more deeply, startling when touched, or meowing more loudly than usual (because it can’t hear its own voice as well). Since the loss is gradual, many owners attribute the changes to normal aging behavior rather than hearing decline. There’s no way to reverse presbycusis, but knowing it’s happening can help you adjust, like approaching your cat from where it can see you rather than sneaking up from behind.