A good starting point is to sit close enough that your forearms can stay roughly level with the keyboard and your elbows are just in front of your body, not jammed into your sides or stretched way out. In practice, many teachers use a simple check: your knees should fit under the keyboard comfortably, and you should be able to reach the keys without leaning forward.

Quick fit test

  • Sit on the front half of the bench.
  • Let your hands rest on the keys.
  • Your wrists and forearms should feel relaxed and close to parallel with the floor.
  • If your shoulders have to reach forward, move closer.
  • If your elbows feel cramped or your knees hit the piano, move back a little.

Easy rule of thumb

A common benchmark is being far enough back that your fingertips can reach comfortably without your upper arms collapsing inward, while still keeping a balanced posture. One piano lesson source describes the correct distance as allowing your knees to be about two inches from the keyboard area and your arms to open easily, with the hands able to touch the fallboard when arms are lifted and fists are formed. Another teaching guide emphasizes that the best distance is individual, but should support relaxed arms and balanced posture rather than forcing a fixed number.

What to avoid

  • Too close: cramped elbows, bent wrists, and tension in the shoulders.
  • Too far: leaning forward, reaching for the keys, and loss of control.
  • Sitting too far back on the bench: it usually makes balance worse and reduces freedom in the arms.

Practical example

If you place your hands on middle C area and your elbows end up slightly in front of your torso, with no need to lean, you are probably in a good spot. If you have to scoot your torso forward to play comfortably, bring the bench closer. The main goal is comfort plus alignment : relaxed arms, level wrists, and enough space for your knees and pedals.