Quick answer: For most adults, a standard katana with a blade of about 28 inches (71 cm, roughly 2.35 shaku) and a handle of 10 to 13 inches is the right size. If you practice iaido or cutting, a common rule of thumb is to add about 0.05 shaku (roughly 0.6 in / 1.5 cm) of blade for every 5 cm (2 in) of height, starting around 2.30 shaku (27.4 in) at 5'3". If you are buying for display, size matters far less than proportion and the space where the sword will sit.
"What size katana do I need?" is one of the most common questions we get. The answer depends on two things: your height and what you plan to do with the sword. This guide explains how katana length is measured, gives a height-based sizing chart, and shows how to pick between standard, long, and shorter Japanese swords.
How katana length is measured
Katana size is described by the nagasa, the blade length. It is measured in a straight line from the tip of the kissaki to the mune-machi, the small notch on the spine where the blade meets the tang. It does not include the handle, and it is not measured along the curve.
- Nagasa: blade length, the number that defines the sword's class.
- Tsuka length: handle length, which affects grip spacing and leverage.
- Overall length: blade plus handle, or the full length in the saya. Useful for display and storage planning.
Traditional measurements use the shaku, about 11.93 inches (30.3 cm). A katana, by definition, has a blade longer than 2 shaku (about 24 inches / 60.6 cm). Not sure which part is the mune-machi? See our guide to the parts of a katana.
Katana size chart by height
This chart reflects a sizing convention widely used in iaido. Treat it as a starting point, not a rule. Arm length, school, and personal preference all matter, and many instructors have their own guidance.
| Your height | Suggested blade length | Shaku |
|---|---|---|
| 4'11" (150 cm) | 26.2 in (66.7 cm) | 2.20 |
| 5'1" (155 cm) | 26.8 in (68.2 cm) | 2.25 |
| 5'3" (160 cm) | 27.4 in (69.7 cm) | 2.30 |
| 5'5" (165 cm) | 28.0 in (71.2 cm) | 2.35 |
| 5'7" (170 cm) | 28.6 in (72.7 cm) | 2.40 |
| 5'9" (175 cm) | 29.2 in (74.2 cm) | 2.45 |
| 5'11" (180 cm) | 29.8 in (75.8 cm) | 2.50 |
| 6'1" (185 cm) | 30.4 in (77.3 cm) | 2.55 |
| 6'3" (190 cm) | 31.0 in (78.8 cm) | 2.60 |
The difference between rows is small, about half an inch. A blade one or two rows off from your height will still feel natural for most people, especially beginners. Going much longer than recommended makes drawing (nukitsuke) and re-sheathing (nōtō) harder and less safe.
Sizing by use
Display and collecting
Your height does not matter for a display sword. What matters is the space: a standard katana is about 40.5 inches (103 cm) long in the saya, so measure your stand, wall, or mantel first. Our katana display case guide covers how to plan the space.
Iaido and kata practice
Here, sizing by height matters most, because you draw and sheathe the sword repeatedly. Start with the chart above and confirm with your instructor. Many beginners train with an unsharpened iaito; see types of iaido practice swords.
Cutting (tameshigiri)
Cutting practitioners care about blade length, but also weight, balance, and edge geometry. A standard 28 inch blade suits most cutters. Very tall practitioners may prefer a longer blade for reach.
Handle length: the overlooked measurement
The tsuka should fit both hands with a small gap between them, with your right hand just behind the tsuba and your left hand near the kashira (end cap). Longer handles give more leverage; shorter ones feel quicker. MoonSwords katana come with handles in two common sizes:
- About 11.4 in (29 cm): a compact grip that suits average to smaller hands, found on swords like the Tenpa Katana.
- About 12.6 in (32 cm): a longer grip that suits larger hands and taller users, found on swords like the Kyūbi Katana.
Our wrap and grip construction is explained in the role of hilt wrapping in katana design.
Choosing a MoonSwords size
| If you are... | Consider | Blade length |
|---|---|---|
| About 5'3" to 5'10", or buying for display | A standard katana from our Japanese sword collection | About 28 in (71 cm) |
| Under about 5'3", or want a lighter companion piece | A wakizashi | About 20 in (51 cm) |
| Looking for a desk or shelf piece | A tantō | About 12.6 in (32 cm) |
| Wanting a dramatic oversized display centerpiece | The Black Mortal Blade odachi | 37.4 in (95 cm) |
| Planning a fully custom mount | The T10 bare blade, fitted with your own tsuka, tsuba, and saya | Standard katana blade |
Are you taller and practicing with a longer sword in mind? Contact us before ordering. We are happy to talk through options.
Frequently asked questions
What size katana should I get for my height?
For most adults between about 5'3" and 5'10", a blade of 27.5 to 29 inches (70 to 74 cm) is a good fit. A standard 28 inch (71 cm) blade is the safest all-around choice.
How long is a standard katana?
A standard katana has a blade of about 28 inches (71 cm) and is about 40 inches (103 cm) overall in the scabbard. By definition, a katana blade is longer than 2 shaku, about 24 inches (60.6 cm).
Does katana length include the handle?
No. Katana length (nagasa) refers to the blade only, measured in a straight line from the tip to the mune-machi notch on the spine.
Is a longer katana better?
Not necessarily. A longer blade adds reach but is harder to draw, sheathe, and control. Choose the length that fits your body and your use, not the longest one available.
Does height matter for a display katana?
No. For display, the important measurements are overall length and the space where the sword will be shown.
What is an odachi?
An odachi (or nodachi) is an extra-long Japanese sword with a blade well beyond a standard katana, often over 3 shaku (about 36 inches). Today they are mostly display pieces.