| Tantō |
短刀 |
15–30 cm |
In belt or carried |
Dagger / backup weapon |
Used for close combat, utility, and ritual |
| Kaiken |
懐剣 |
20–25 cm |
Hidden in clothing |
Concealed dagger |
Female samurai self-defense and ritual tool |
| Wakizashi |
脇差 |
30–60 cm |
Edge up in obi |
Secondary sword |
Paired with katana |
| Kodachi |
小太刀 |
50–60 cm |
Edge down |
Smaller battlefield sword |
Distinct from wakizashi in origin |
| Uchigatana |
打刀 |
60–70 cm |
Edge up in obi |
Transitional battlefield sword |
Predecessor of katana |
| Katana |
刀 |
60–80 cm |
Edge up in obi |
Primary sidearm |
Optimized for infantry |
| Tachi |
太刀 |
70–90 cm |
Hung edge down |
Mounted combat |
Older than katana |
| Ōdachi |
大太刀 |
100+ cm |
Carried on back/attendant |
Anti-cavalry / battlefield |
Too long for indoor use |
| Nodachi |
野太刀 |
100+ cm |
Slung on back |
Open-field combat |
Field sword; similar to ōdachi |
| Naginata |
薙刀 |
Variable |
Mounted on pole |
Polearm |
Curved blade on staff |
| Yari |
槍 |
Variable |
Mounted on pole |
Spear warfare |
Straight thrusting weapon |