Enter your room and choose a grand or an upright. You get the longest grand Yamaha's rule of thumb gives the room, the makers' pianos that suit it and fit with the bench pulled out, and each one's real size from the makers' own specs.
Your piano
Up to a 5′3″ grand for your 15′ × 12′ roomYamaha’s rule: the walls ten times the piano, so 5′4¾″ at most · 4 of 15 grands here
Quick answer: almost every piano is about 5 feet wide (Yamaha). Uprights stand 43–52″ tall and 21–26″ deep; grands run from 5′ (Yamaha GB1K) to 8′11¾″ (Steinway Model D) long, measured from the front of the keys to the end of the lid. Yamaha’s rule of thumb: the room’s walls should add up to at least ten times the piano’s length, so a 15′ × 12′ room (54′ of wall) suits a grand up to about 5′4″. Add 2 feet in front for the bench.
How to use the piano size tool
- Measure the room the piano will live in: its length and width.
- Choose grand or upright, and pick a model if you have one in mind.
- You get the longest grand the room suits, every maker’s piano here that suits it and fits with the bench pulled out, and the room drawn from above to scale.
Arranging the rest of the room? The living room layout planner draws it to scale.
The rules, and where they come from
The room. Yamaha, “What’s the Best Piano for Your Room?” (2025): “the total length of the walls of the room should be at least ten times bigger than the length of the piano. A 9-foot concert grand piano, for example, should ideally be placed in a room that has 90 feet or more of total wall length”.
The bench. Yamaha suggests tracing the piano’s outline on paper and adding “an extra 2 feet to the depth of the outline to allow for when the bench is pulled out while you’re playing.”
The sizes. “Grand piano length is measured from the key slip — the piece of wood in front of the keys on the keyboard — to the very end of the lid”, and “almost all pianos — both grands and uprights — are approximately 5 feet wide”, because they share the 88-note keyboard. The lengths, widths and weights below are from Yamaha’s and Steinway’s own spec pages.
Where it goes. Yamaha: “upright pianos are designed to be placed against a wall”; grands “sound best when they’re out in the middle of a room, or placed at a 45-degree angle in a corner”. Never in direct sunlight, and not near air vents.
Grand piano sizes
| Grand | Length | Width | Weight | Walls it asks for |
|---|---|---|---|---|
| Yamaha GB1K | 5′ | 57″ | 574 lb | 50′ |
| Steinway Model S | 5′1″ | 57¾″ | 579 lb | 50′10″ |
| Yamaha GC1 | 5′3″ | 59″ | 639 lb | 52′6″ |
| Yamaha C1X | 5′3″ | 59″ | 638 lb | 52′6″ |
| Steinway Model M | 5′7″ | 57¾″ | 603 lb | 55′10″ |
| Yamaha GC2 | 5′8″ | 59″ | 674 lb | 56′8″ |
| Yamaha C2X | 5′8″ | 59″ | 671 lb | 56′8″ |
| Steinway Model O | 5′10¾″ | 57¾″ | 662 lb | 58′11½″ |
| Yamaha C3X | 6′1″ | 59″ | 704 lb | 60′10″ |
| Steinway Model A | 6′2″ | 57¾″ | 720 lb | 61′8″ |
| Yamaha C5X | 6′7″ | 59″ | 770 lb | 65′10″ |
| Steinway Model B | 6′11″ | 58″ | 802 lb | 69′2″ |
| Yamaha C6X | 7′ | 61″ | 893 lb | 70′ |
| Yamaha C7X | 7′6″ | 61″ | 913 lb | 75′ |
| Steinway Model D | 8′11¾″ | 61¾″ | 1,064 lb | 89′9½″ |
Upright piano sizes
| Upright | Height | Width | Depth | Weight |
|---|---|---|---|---|
| Yamaha b1 | 43″ | 58¼″ | 21¼″ | 384 lb |
| Yamaha b2 | 44½″ | 59″ | 21″ | 428 lb |
| Yamaha b3 | 48″ | 60″ | 24″ | 523 lb |
| Yamaha U1 | 48″ | 60″ | 24″ | 502 lb |
| Yamaha YUS1 | 48″ | 60″ | 24″ | 502 lb |
| Yamaha U3 | 52″ | 60″ | 26″ | 517 lb |
| Yamaha YUS3 | 52″ | 60″ | 26″ | 517 lb |
| Yamaha YUS5 | 52″ | 60″ | 26″ | 530 lb |
The longest grand for each room
| Room | Walls in all | Grand up to | Largest here |
|---|---|---|---|
| 12′ × 10′ | 44′ | 4′4¾″ | an upright |
| 14′ × 12′ | 52′ | 5′2½″ | Steinway Model S, 5′1″ |
| 15′ × 12′ | 54′ | 5′4¾″ | Yamaha C1X, 5′3″ |
| 16′ × 14′ | 60′ | 6′ | Steinway Model O, 5′10¾″ |
| 18′ × 15′ | 66′ | 6′7¼″ | Yamaha C5X, 6′7″ |
| 20′ × 15′ | 70′ | 7′ | Yamaha C6X, 7′ |
| 24′ × 18′ | 84′ | 8′4¾″ | Yamaha C7X, 7′6″ |
Worked examples
Up to a 5′3″ grand for your 15′ × 12′ room: its walls add up to 54′, so Yamaha’s rule allows 5′4¾″: the GB1K, the Steinway Model S, the GC1 or the C1X.
Up to a 7′ grand for your 20′ × 15′ room: 70′ of wall, room for a Yamaha C6X or anything shorter.
The Yamaha C3X is too big for your 15′ × 12′ room: 6′1″ long, it asks for 60′10″ of wall and the room has 54′. It fits on the floor; Yamaha’s rule is about the sound.
No grand piano suits your 10′ × 10′ room: 40′ of wall allows 4′, shorter than any grand here. Any of Yamaha’s uprights fits against one wall.
Common mistakes
- Measuring a grand without the bench. The player sits in front of it: add 2 feet.
- Buying the biggest grand that fits the floor. A large grand “might be overbearing” in a lively room (Yamaha); its ten-times rule is about sound, not floor space.
- Pushing a grand against a wall. Grands sound best out in the room or at 45° in a corner; uprights go against a wall.
- Putting it by a sunny window or a vent. Heat and changing temperatures harm the instrument.
More on pianos at Dreamy Home Style
- Grand piano living room layouts
- Upright piano decor ideas
- Piano room decor ideas
- Compact music studio ideas
Placing it with the furniture? Draw the room to scale in the free 2D floor planner.
Piano size questions
What are the dimensions of an upright piano?
Yamaha’s current uprights stand 43–52″ tall and are 58¼–60″ wide and 21–26″ deep: the b1 is 43 × 58¼ × 21¼″, the U1 48 × 60 × 24″.
What are the dimensions of a grand piano?
From 5′ long and 57″ wide (Yamaha GB1K) to 8′11¾″ long and 61¾″ wide (Steinway Model D), measured from the front of the keys to the end of the lid.
What size are grand pianos?
Yamaha’s run 5′ to 7′6″ in its GB1K, GC and CX lines; Steinway’s Models S, M, O, A, B and D run 5′1″, 5′7″, 5′10¾″, 6′2″, 6′11″ and 8′11¾″.
How big a room do you need for a grand piano?
By Yamaha’s rule, walls adding up to ten times its length: 50′ of wall for a 5′ grand (a 15′ × 10′ room), 70′ for a 7′ grand, plus 2 feet for the bench.
How wide is a piano?
About 5 feet, grand or upright, because every one carries the same 88-key keyboard: 57″ to 61¾″ across the pianos here.
What are spinet piano dimensions?
Spinets are the smallest uprights, “popular decades ago but rarely made today” (Yamaha). The smallest upright Yamaha makes now, the b1, is 43″ tall, 58¼″ wide and 21¼″ deep.