Graded Hammer Action vs Weighted Keys: What's the Difference?

Digital piano key actions range from very light to very heavy:

• • Non-weighted (Synth action). Spring-loaded keys with no hammer mechanism. Very light, and common in keyboards under $200.
• • Semi-weighted. Springs with some added resistance. Lighter than a real piano, and common in budget portables.
• • Weighted. A general term meaning the keys have some form of resistance beyond springs, anything from basic weights to full hammer mechanisms.
• • Hammer action. Keys use actual hammers (or simulated hammer mechanisms) to create resistance, like an acoustic piano.
• • Graded hammer action. Hammer action where the weight changes gradually across the keyboard: heavier in the bass, lighter in the treble.
• • Premium graded actions. Top-tier mechanisms with wood keys, counterweights, and escapement simulation.

"Weighted keys" is a marketing term, not a technical specification. It simply means the keys are heavier than a basic synth-style keyboard. A piano advertised as having "weighted keys" could have:

• • Basic spring-and-weight mechanisms
• • Semi-weighted action
• • Full hammer action

The term doesn't tell you *how* the keys are weighted. Always look for the specific action name (e.g., "Graded Hammer Standard", "PHA-4 Standard", "Responsive Hammer Compact") rather than relying on the generic "weighted" label.

Graded hammer action is a specific type of key mechanism where:

• • Hammers physically strike when you press a key, creating natural resistance
• • Graded means the weight changes across the keyboard: bass keys are heavier, treble keys are lighter

This mirrors how an acoustic piano works. On a real piano, the bass strings are thicker and heavier, requiring more force. Graded hammer action replicates this feeling.

Common graded hammer actions by brand:

• • Yamaha: Graded Hammer Standard (GHS), Graded Hammer 3 (GH3), GrandTouch
• • Roland: PHA-4 Standard, PHA-50, PHA-50M
• • Kawai: Responsive Hammer Compact (RHC), RH III, Grand Feel III
• • Casio: Smart Scaled Hammer Action, Tri-Sensor Scaled Hammer Action II

If you're learning piano, at age 8 or 80, graded hammer action matters for a few reasons:

Technique transfer. When you eventually play an acoustic piano (at a concert, a friend's house, a church), your fingers will know what to expect. If you learned on non-weighted keys, the transition is jarring.

Dynamic control. Graded action lets you develop the finger strength and control needed to play softly and loudly with intention. Light keys neither require this control nor develop it.

Musical expression. The physical sensation of heavier bass keys and lighter treble keys becomes part of your musical intuition. You learn to adjust your touch for different registers.

Our scoring. On 1st Note, our Touch Reality score directly reflects key action quality. Models with graded hammer action score 4+ on this axis; premium graded actions score 7+.

Complete beginners on a tight budget. At minimum, get a semi-weighted action. But if you can stretch to a basic hammer action (models in the $300–$500 range), do it. You'll build better habits from day one.

Committed beginners and returning players. Graded hammer action is the sweet spot. Look for our Touch Reality score of 4–6. Models in the $500–$1,000 range typically offer this.

Intermediate to advanced players. Premium graded actions with ivory-feel key surfaces and escapement mechanisms, a Touch Reality score of 7+, and a budget of $1,000 and up.

The bottom line: "Weighted keys" is vague. "Graded hammer action" is specific and desirable. When comparing pianos, look at the exact action name and check our Touch Reality score for an objective comparison.