What is the slimmest 88-key digital piano in 2026?

The slimmest 88-key digital pianos are the Casio PX-S1100 and Casio CDP-S160, both at 232 mm (9.1 inches) deep. They share Casio's slim chassis design — the PX-S1100 is the premium version with better sound and a better action; the CDP-S160 is the budget version at the same depth. No other manufacturer currently offers a weighted 88-key piano this slim.

Does a slimmer piano mean a worse key action?

There is an engineering trade-off. To achieve a slim chassis, manufacturers shorten the key pivot point — the lever from the back of the key to the pivot is shorter than in a traditional hammer action. This means the keys feel slightly different near the fallboard. For pop, jazz, and casual learning, the difference is imperceptible. Players training serious classical technique sometimes notice the shorter throw compared to a Kawai or full-depth Roland action. The Roland FP-30X (at 284 mm) preserves the traditional pivot length but pays for it in depth.

Is the Yamaha P-225 noticeably deeper than the Casio PX-S1100?

The P-225 is 258 mm (10.2") deep versus the PX-S1100's 232 mm (9.1") — about a 1-inch difference (26 mm). On a standard 24-inch deep desk, both pianos fit; the Yamaha just sits closer to the front edge. On a narrow 10-inch console table, the Casio fits flush while the Yamaha overhangs by about an inch. In tight studio apartments, the inch matters more than it sounds — it's the difference between a piano that disappears against a wall and one that's noticeably present in the room.

Can I fit an 88-key digital piano in a studio apartment?

Yes, with planning. The slimmest options (PX-S1100 or CDP-S160 at 232 mm, the Yamahas at 258 mm) can sit on a narrow console table or a purpose-built keyboard stand against a wall. They take up no more floor space than a narrow bookshelf. The key dimension to plan for is width — all 88-key instruments are approximately 1322 mm (52 inches) wide. The depth determines whether it fits on existing furniture; the width determines whether you have a 4.5-foot stretch of wall to put it against. If mechanical key noise is also a concern for apartment life, see Quietest Digital Piano Key Actions — all five of these pianos are ranked by thud and clack.

Is the Casio PX-S1100 worth $180 more than the CDP-S160 if they're the same size?

Yes if sound or action matters at all to you. The PX-S1100 has 192-note polyphony (vs 64 on the CDP-S160 — the difference is real once you start using the sustain pedal heavily), the better Multi-Dimensional AiR sound engine, Smart Scaled Hammer action (more refined than the CDP-S160's Scaled Hammer Action II), and Bluetooth. If you're a complete beginner unsure whether you'll stick with piano, the CDP-S160 is the safer bet. If you've played before and you know you want a real instrument, the PX-S1100 earns its $180 premium.

How much weight should I expect from a slim 88-key piano?

The slim 88-key pianos in this article weigh 10.5–14.8 kg (23–33 lbs). The Casios are the lightest (CDP-S160 at 10.5 kg, PX-S1100 at 11.2 kg). The Yamahas are similar (P-145 at 11.1 kg, P-225 at 11.5 kg). The Roland FP-30X is the heaviest at 14.8 kg, primarily because of its more substantial PHA-4 action mechanism. For carrying to gigs or moving between rooms regularly, the Casios or Yamahas are noticeably easier; for a dedicated home setup, weight rarely matters.

Will a slim 88-key piano fit on a standard X-stand or Z-stand?

Yes — all five pianos in this article fit standard X-stands and Z-stands without modification. Most keyboard stands have arms that extend 14–18 inches deep, well beyond the 9.1–11.2 inch depth of these pianos. The slim chassis helps more on console tables, desks, and dedicated piano furniture (like a table-style stand) than on adjustable stands designed for full-size keyboards.

Why is the PX-S1100 so much slimmer than competitors?

Casio engineered a custom hammer action specifically for the slim chassis. Most digital pianos use hammer actions designed decades ago for cabinets that were 14–16 inches deep, and the keys' mechanical lever needs that depth to swing. Casio's Smart Scaled Hammer redesigned the lever geometry to work in roughly half the depth, which is why the PX-S1100 (and the related CDP-S160) hit 232 mm while everyone else lands at 258 mm or deeper. The trade-off is the shorter pivot feel near the fallboard. The reward is a piano that fits places no other 88-key weighted instrument can.