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Model guideKawai K-3 vs K-300: identify the model, then assess the instrument.
The Kawai K-3 is a discontinued upright. The K-300 is its named successor. If you are looking at a used K-3, the current K-300 reference tells you about the current model, not about the used instrument in front of you. This guide explains what carries over, what does not, and what to check.
Published 23 October 2026 · 1 minute read · Written for buyers, not for any one instrument
The K-300 is the named successor to the K-3.
Kawai's US product page for the K-300 describes it as building upon the legacy of its predecessor, the K-3. Kawai's discontinued models FAQ lists the K-3 among its discontinued acoustic uprights. The K-3 is no longer manufactured; the K-300 is the current model in that position.
Sources: Kawai US K-300 product page and Kawai US discontinued models FAQ.
What the current model publishes.
The K-300 reference from Kawai's product pages:
- Height: 122 cm
- Width: 149 cm
- Depth: 61 cm
- Weight: 227 kg
- Action: Millennium III Upright Action
- White key surfaces: Acrylic
- Black key surfaces: Phenol
Sources: Kawai US and Kawai Global. These are current model references, not specifications for a used K-3 from an earlier production year.
The instrument, not the model name.
The current K-300 reference describes the current K-300. It does not establish:
- The exact dimensions, weight or action components of a used K-3 from a different production era
- The condition, service history or tuning stability of the particular instrument
- Whether the K-3 you are looking at has original parts or has been modified
- Current availability or price of any instrument
A used K-3 is assessed on its own merits. Use the serial number and maker reference to investigate the approximate year, then assess the instrument itself using the viewing checklist. The model name tells you where it sits in Kawai's range; the inspection tells you what you are actually buying.
Two current models, different sizes.
If you are comparing current Kawai uprights, the K-300 (122 cm) and K-500 (130 cm) are two different reference sizes. The K-300 vs K-500 guide compares them from the maker's published references. That comparison is about the current models, not about used K-3 instruments.
K-3 and K-300, answered.
Is a Kawai K-3 the same model as a K-300?
No. Kawai lists the K-3 as a discontinued upright and identifies it as the K-300’s predecessor. Do not rename an older K-3 as a K-300 or assume its parts and specification match a current K-300.
Can I still find a Kawai K-3?
You may encounter a K-3 offered for sale even though Kawai lists it as discontinued. Establish the actual instrument’s age, history and condition. This guide does not verify a seller’s stock or promise that Music Companion has a K-3 available.
Can I use K-300 measurements for a K-3?
The current K-300 reference is 122 cm high, 149 cm wide and 61 cm deep, with a published mass of 227 kg. That reference alone does not establish a K-3’s measurements. Check a maker record for the exact K-3 and measure the actual instrument before planning the room or delivery.
What matters when comparing a used K-3 and K-300?
Record the model and serial number, the source and limits of an age lookup, service or repair history, and the condition reported for each piano. Play the actual instruments and compare quotations for delivery, tuning and any written cover.
Does the newer model name settle which piano to buy?
No. A model reference cannot tell you how two used instruments have been maintained or prepared. Compare the actual pianos and ask a qualified technician about uncertain mechanical condition; a newer name is not a condition assessment.
Where the rest is set out on this site: Kawai K-300 vs K-500 → Serial number and age lookup → Used piano viewing checklist → Available pianos → All guides →
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Ask which instruments are currently available and give the exact model or question you want to discuss.