PIANO KNOWLEDGE · PNO-024
How Do Yamaha Grand Piano Sizes Differ? Compare GB1K to C7X with Prices
Comparing the GB1K, C1, C2, C3, C5, C6 and C7—and the options available when buying
Quick answer
A longer piano is not automatically the right choice for every home. Consider the actual room, intended use and budget, then compare key weight and tonal balance by playing the instruments in person.
As a Yamaha grand piano becomes longer, its strings become longer and its soundboard area increases. This can provide greater projection and a broader tonal dimension, but the size must still suit the space where the piano will be used. This guide moves from the GB1K through to the C7 to make it easier to compare dimensions and budgets.
1. How long is each Yamaha grand piano size?
The dimensions below use current new Yamaha models in the Thai market as a reference. Reconditioned instruments may be from earlier G Series or C Series generations, so always check the serial number, actual condition and individual specifications of each piano.
| Size group | New Yamaha example | Approximate length | Suitable applications |
|---|---|---|---|
| Entry grand | GB1K | 151 cm | Suitable for home use and for households beginning with a grand piano while keeping placement manageable. |
| Compact grand | C1X | 161 cm | Suitable for home use and for households wanting a compact model from the CX Series. |
| Lower mid-size grand | C2X | 173 cm | Suitable for larger homes and players who want longer strings and a larger soundboard area. |
| Mid-size grand | C3X | 186 cm | Suitable for larger homes, studios and teaching spaces that need greater projection and tonal dimension. |
| Large grand | C5X | 200 cm | Suitable for larger homes, studios and reception areas that clearly benefit from a longer instrument. |
| Grand for larger spaces | C6X | 212 cm | Suitable for larger homes, small performance rooms, institutions and spaces requiring greater projection. |
| Extra-large grand | C7X | 227 cm | Suitable for larger homes, stages, institutions and spaces designed to accommodate a large grand piano. |
Note: Yamaha Thailand lists the GB1K at 151 cm and the C1X, C2X, C3X, C5X, C6X and C7X at 161, 173, 186, 200, 212 and 227 cm respectively. Model availability, prices and available finishes should be confirmed before making a decision.
2. Comparing options by size and budget
The table shows the main choices from left to right: new Yamaha, Churairat reconditioned Yamaha and new Classic grand pianos from Churairat Music. Approximate price ranges are used so the article remains useful as a general guide.
| Yamaha size reference | New Yamaha | Churairat reconditioned Yamaha | New Classic by Churairat |
|---|---|---|---|
| 151–152 cm / GB1K | GB1K: approximately THB 400,000 | — | GPX-152: approximately THB 200,000 Buy-back guarantee included |
| 161 cm / C1X | C1X: approximately THB 800,000–900,000 | — | GPX-152: approximately THB 200,000 as a smaller alternative Buy-back guarantee included |
| 173 cm / C2X | C2X: approximately THB 900,000–1,000,000 | G-2, 2 pedals: approximately THB 295,000 (approx. 169–173 cm) Buy-back guarantee included | — |
| 186 cm / C3X | C3X: approximately THB 1.3 million | G-3, 2 pedals: approximately THB 325,000–395,000 (approx. 183–186 cm) G-3, 3 pedals: approximately THB 495,000 (approx. 183–186 cm) C-3: approximately THB 650,000–695,000 (approx. 186 cm) Buy-back guarantee included | — |
| 200 cm / C5X | C5X: approximately THB 1.5 million | G-5, 2 pedals: approximately THB 395,000 G-5, 3 pedals: approximately THB 595,000–675,000 C-5: approximately THB 750,000 Buy-back guarantee included | — |
| 212 cm / C6X | C6X: approximately THB 1.6 million | — | — |
| 227 cm / C7X | C7X: approximately THB 1.7 million | C-7: approximately THB 850,000–875,000 Buy-back guarantee included | — |
Price note: New Yamaha prices are approximate reference figures for budget comparison. Reconditioned Yamaha prices are reference prices from July 2026. Actual prices and availability may vary by sub-model, production year, finish, condition and the details of each individual piano. Please confirm current stock and pricing before making a decision.
Churairat Lifetime Buy-Back Guarantee
The Churairat grand pianos shown in the table include the Churairat Lifetime Buy-Back Guarantee, subject to company terms and an assessment based on the piano's condition and market conditions at the time of evaluation.
3. What changes can a player experience as the piano becomes longer?
A longer piano has longer strings and a larger soundboard, creating the potential for greater projection, resonance and tonal dimension. However, what a player actually experiences also depends on the design of each model, the piano's condition and how well the instrument has been regulated.
| What changes with size | How it affects the buying decision |
|---|---|
| Strings and soundboard | A longer piano generally offers greater potential for projection and tonal dimension. |
| Placement and lid clearance | Measure the piano's length and width, bench position and lid-opening direction to ensure the layout suits the room. |
| Moving access | Assess doors, corridors, lifts, stairs and the final placement using the actual dimensions of the selected model. |
| Budget and long-term use | Compare the size you genuinely need with your budget. There is no need to begin with the longest model. |
4. New Yamaha, new Classic or reconditioned Yamaha—which should you choose?
Choose this option if you want a current factory-new model with a clearly defined budget. The GB1K is the entry grand, while the C1X through C7X provide progressively longer options.
Choose the 152 cm Classic GPX-152 from Churairat Music if you want to begin with a new, fully playable grand piano at a budget of approximately THB 200,000, with a buy-back guarantee included.
Choose this option if you want a longer Yamaha grand at a lower budget. Options range from the G-2, G-3 and G-5 to the C-3, C-5 and C-7.
| Topic | New Yamaha | Reconditioned Yamaha | New Classic |
|---|---|---|---|
| Condition | Factory new | Used piano that has been inspected and reconditioned | Factory new |
| Size options | Multiple sizes from GB1K to C7X | Depends on model and available inventory | Depends on models offered by Churairat Music |
| Main advantage | Current factory-new models | Potential to obtain a larger Yamaha grand within a lower budget | A new grand piano starting at around THB 200,000 |
| What to consider | Budget and room suitability | Actual condition, sub-model, production year and reconditioning quality | Compare tone, key weight and response on the actual instrument |
Every reconditioned Yamaha from Churairat Music must pass the Churairat Recondition Standard before delivery. More than 50 points are inspected and reconditioned, covering the structure, soundboard, keyboard action, hammers, exterior and interior components, tonal balance regulation and tuning. This standard has helped Churairat Music's pianos earn customers' trust over many years.
5. What is the difference between two and three pedals?
Some reconditioned grand pianos have two pedals, while others have three. Consider whether the player needs the function of the middle pedal.
Grand piano with two pedals
The right pedal is the sustain or damper pedal, which allows notes to continue sounding and resonating.
The left pedal is the soft pedal, which reduces volume or changes the tonal character.
Grand piano with three pedals
It has the same right and left pedals, plus a middle pedal known as the sostenuto pedal. This sustains only the notes held before the pedal is pressed.
Check the actual instrument: The function of the middle pedal on a used grand piano can vary by model, production period and individual specification. Always confirm the middle-pedal function on the specific piano you are considering.
6. Frequently asked questions
What are the main differences between the GB1K, C1, C2 and C3?
The main difference is length: approximately 151, 161, 173 and 186 cm respectively. A longer piano has longer strings and a larger soundboard, giving it the potential for greater projection and tonal dimension.
Which size should I choose for my first grand piano?
Begin by measuring the actual space and setting a budget. The GPX-152 and GB1K are entry-size grand pianos, while the C1X and C2X suit buyers who want to move into the CX Series.
Is a reconditioned Yamaha better value?
It may offer better value if you want a longer Yamaha grand within a limited budget. However, selection must be based on the instrument's actual condition and reconditioning standard—not only its model name or age.
Do Churairat grand pianos include a buy-back guarantee?
Yes. Churairat grand pianos include the Churairat Lifetime Buy-Back Guarantee, subject to company terms and an assessment based on the piano's condition and market value at the time of evaluation.
Is a C7 suitable for a home?
It can be suitable if the space can accommodate its placement, lid opening, moving access and sound control. The actual room should always be assessed first.
Is there a big difference between a 173 cm and a 186 cm grand piano?
The cabinet length differs by 13 cm, but differences in tone and response also depend on the model, design, condition and regulation. It is best to compare the actual instruments in person.
Can a grand piano fit in a 3 × 4 metre room?
It may be possible, but you should also consider the piano's width, bench space, walkways, lid-opening direction and the room's acoustic behaviour. Room area alone is not enough to make the decision, so measure the actual layout before buying.
Is a 30-year-old used grand piano still worth buying?
Age alone does not determine quality. Check the structure, soundboard, strings, tuning pins, hammers, action, pedals, maintenance history and reconditioning quality, and always play the actual piano before purchase.
Conclusion
Yamaha grand pianos from the GB1K to the C7 range from approximately 151 to 227 cm in length. A good choice is the length that suits the room and intended use, while comparing new Yamaha, new Classic and Churairat reconditioned Yamaha options by budget, instrument condition and buy-back support.
Support when you want to upgrade or no longer use the piano
The Churairat Lifetime Buy-Back Guarantee provides buyers with a future option, subject to company terms and an assessment based on the piano's condition and market conditions at the time of evaluation.
