Choosing the Right Iaito for Iaido Practice
A practical sizing guide grounded in Japanese tradition, simple, accurate, and dojo-friendly.
In Iaido
, the sword is more than a tool, it embodies precision, posture, and intent. The correct length allows smooth nukitsuke
(draw), controlled kirioroshi
(cut), and clean noto
(re-sheathing). Historically, Japanese sword length was expressed in shaku
, an old unit of measurement still used today by swordsmiths and martial artists alike.
Understanding the Shaku
One shaku
equals approximately 11.93 inches
. Traditional Japanese swords are sized in shaku to match a practitioner’s body and technique. Most modern iaito
for adult training fall between 2.30 and 2.45 shaku
, which translates to roughly 27"–29"
in blade length. This range accommodates the majority of practitioners across standard height ranges.
Recommended Lengths by Practitioner Height
The chart below provides practical guidance for selecting from our available iaito sizes 27", 28", and 29" blades, most featuring a comfortable 10½" tsuka
(handle). These guidelines are based on recommendations used by the All Japan Kendo Federation (ZNKR)
and leading Iaido equipment manufacturers.
| Blade Length (inches) |
Approx. Length (shaku) |
Recommended Height |
Notes |
| 27"
|
~2.30 |
5'2"–5'6" (157–167 cm) |
Ideal for smaller practitioners or those seeking a lighter, quicker draw with reduced shoulder strain. |
| 28"
|
~2.35–2.40 |
5'7"–5'10" (170–178 cm) |
The most common adult size that balances reach, speed, and control for general Iaido practice. |
| 29"
|
~2.40–2.45 |
5'11"–6'3" (180–191 cm) |
Suited for taller practitioners or advanced students preferring a longer draw and natural extension. |
Tradition and Practical Fit
Historically, samurai had their swords fitted to their own proportions. The length balanced with stance, hip height, and draw mechanics. Modern iaito
preserve that philosophy, refined by the All Japan Kendo Federation
to standardize safe and efficient training. A properly sized blade allows relaxed shoulders during nukitsuke
and avoids overreaching or bending at the hip during noto
.
Tips for Selecting Your First Iaito
- When in doubt, go shorter.
A slightly shorter blade promotes smoother technique and helps develop clean form before advancing to longer swords.
- Confirm your dojo’s rules.
Some instructors or federations have preferred blade lengths or material requirements, especially for beginners.
- Focus on balance, not just length.
A well-balanced iaito with a secure tsuka
and properly fitted saya
enhances both control and safety.
Note:
These recommendations are based on standard ZNKR sizing charts and fit the vast majority of adult Iaido practitioners. For personalized guidance, always consult your instructor before purchasing a new blade.