Katana vs Tachi: How to Tell Two Samurai Swords Apart
To most people a tachi and a katana look like the same sword. Both are curved, single-edged Japanese blades with long wrapped grips, and the same smiths made both. The difference lies in era, curve, length and, above all, how the sword was worn. The tachi is the older sword of mounted samurai, hung edge down from the belt. The katana took over from the 1400s, thrust through the sash edge up so it could be drawn and used in one movement.
The Short Answer
If the sword hangs from two cords or hangers with its edge pointing down, it is mounted as a tachi. If it slides through the belt with its edge facing up, it is a katana. On the bare blade, a tachi is usually longer and more deeply curved, with the deepest part of the curve close to the hilt, while a katana is a little shorter with a shallower curve centered nearer the middle.
Katana vs Tachi at a Glance
| Tachi | Katana | |
|---|---|---|
| Main era | About 900 to 1400 | From about 1400 onward |
| How it was worn | Edge down, hung from the belt by hangers | Edge up, thrust through the sash |
| Typical blade length | About 27 to 31 inches | About 24 to 29 inches |
| Curve | Deeper, strongest near the hilt | Shallower, more evenly spread |
| Main user | Mounted samurai | Samurai fighting on foot, later all samurai |
| Signature side | Signed on the side facing out when worn edge down | Signed on the opposite side, facing out when worn edge up |
What Is a Tachi?
The tachi developed as Japan's mounted warrior class rose between the 900s and 1100s. A rider needed a long, deeply curved sword that hung at an easy angle from the belt and drew cleanly from the saddle. Tachi blades were commonly around 27 to 31 inches, with a strong curve beginning near the hilt, and they were worn suspended edge down from two hangers on the scabbard. The extra long odachi, literally great tachi, was an even bigger version; see odachi vs nodachi for those giants.
What Is a Katana?
By the 1400s Japanese armies relied more on large forces of foot soldiers, and fighting on foot favored a sword that could be drawn and used in a single motion. The katana met that need. Worn edge up through the sash, it could be drawn straight into a cut. Blades became somewhat shorter, usually about 24 to 29 inches, and the curve grew shallower and more evenly spread. The katana became the defining samurai sword and, with the shorter wakizashi, formed the daisho pair. See katana vs wakizashi vs tanto and our guide to the types of Japanese swords.
The Key Differences in Detail
How it was worn
This is the real dividing line. A tachi hangs edge down from the belt, which suits riding. A katana is thrust through the sash edge up, which suits a fast draw on foot.
Curve
Tachi blades typically show a deep curve concentrated near the hilt, a shape that helps a draw from horseback. Katana blades usually have a shallower curve, centered closer to the middle of the blade.
Length
Tachi blades tend to be a few inches longer. Many old tachi were later shortened from the tang end to katana length, a practice called suriage, which is why some antique katana are really cut down tachi blades.
The signature
Smiths signed the tang on the side that faces outward when the sword is worn. Because a tachi is worn edge down and a katana edge up, the signature sits on opposite sides, which is one way experts identify how a blade was originally intended to be worn.
Mounting
The blade alone does not fully decide the name. The same blade can be fitted with tachi mounts or katana mounts, and in later centuries tachi style mountings returned for ceremonial dress.
Which One Fits Your Collection?
Both share the same Japanese craft tradition, so the choice comes down to the era you love. The tachi represents the early mounted samurai and the age of the great clan wars on horseback. The katana represents the classic samurai image of later centuries and is by far the more widely available form today.
Katanas to consider
- Katana Sword, High Carbon 1095 Steel, Wood Sheath, 41", $249.99. A traditional katana with a wooden saya.
- Dragon Katana, Samurai Sword, 1095 High Carbon Steel, 42", $299.99. A slightly longer katana with dragon themed fittings.
- Katana Sword, Highest Grade, High Carbon 1095 Steel with Clay Temper Blade, 40.5", $699.99. Our top grade clay tempered katana, with the visible hamon that differential hardening creates.
Browse the full katana collection, or see our odachi collection for the larger great tachi form.
Frequently Asked Questions
Is a tachi longer than a katana?
Usually, yes. Tachi blades commonly run a few inches longer than katana blades and are more deeply curved.
Can a katana be worn like a tachi?
A blade can be fitted with tachi style mounts, and some were. What makes a sword a tachi or a katana is as much its mounting and how it was worn as the blade itself.
Is an odachi a tachi?
Odachi means great tachi. It is an oversized version of the tachi, often with a blade of 35 inches or more.
Which came first, the tachi or the katana?
The tachi. It dominated from roughly the 900s to the 1400s, when the katana began to replace it.
More Sword Comparisons
- Katana vs Longsword
- Katana vs Wakizashi vs Tanto
- Odachi vs Nodachi
- Scimitar vs Katana
- Saber vs Rapier
- Cutlass vs Saber
- Longsword vs Broadsword
- Longsword vs Greatsword
- Claymore vs Zweihander
- Rapier vs Longsword
For every sword family in one place, see our guide to the types of swords.
