Here's a table with the most common (and a couple of not so common) types of banjo.
| Name | Strings | Scale | Comments |
| Banjolele | 4 | 33-33.5 cm (13-14") | Aka ukulele-banjo |
| Banjolin | 4 | 33-38 cm (13-15") | Almost identical to the mandolin-banjo, but with single strings. |
| Short scale tenor banjo | 4 | 50.5-54.5 cm (20-21.5") | 17 frets. Tuned and played like a regular tenor banjo |
| Tenor banjo | 4 | 55.5-58.5 cm (22-23") | Usually 19, sometimes 18 or 20 frets. |
| Plectrum banjo | 4 | 65-68 cm (26-27") | Usually 22 frets. |
| Bass banjo | 4 | ? | A Gold Tone speciality. Tuned and played like a bass guitar. |
| Upright bass banjo | 4 | ? | The bass instrument of the old banjo orchestras. Tuned and played like a double bass. |
| Piccolo banjo | 5 | 33-33.5 cm (13-14") ? | Old type of banjo. These were sometimes converted banjoleles |
| Banjeaurine | 5 | 53.5-56 cm (21-22") | Fifth string shorter than the others. Extended fingerboard.
Not very common nowadays, this instrument usually took the part of the violin in the banjo orchestras.. |
| Pony banjo | 5 | 50-58.5 cm (20-23") ? | Fifth string shorter than the others.
Aka Lady's banjo. Gold Tone calls a banjo of this size a "mini banjo." Often tuned in C, a fourth higher than the regular five-stringer. |
| A-scale five-string banjo | 5 | 61-64 cm (24-25") | Fifth string shorter than the others.
Gold Tone calls a banjo of this size a "travel banjo." |
| Five-string banjo | 5 | 65-68 cm (26-27") | Fifth string shorter than the others.
Aka Folk banjo, bluegrass banjo etc. This is the most common type of banjo today. |
| Long-scale banjo | 5 | 81 cm (32") | Fifth string shorter than the others.
Apparently this banjo was specially designed for Pete Seeger. |
| Cello banjo | 5 | ? | Fifth string shorter than the others. Played in upright position like a cello or double bass. |
| Guitar-banjo | 6 | 59-66 cm (23-26") | Aka banjo-guitar or banjitar
Most guitar banjos have a fairly long scale length. |
| Mandolin-banjo | 8 | 33-38 cm (13-15") | Aka mando-banjo. Almost identical to the banjolin, but with double strings. |
| 12-string guitar-banjo | 12 | 59-63 cm (23-25") | Aka 12-string banjo-guitar or banjitar.
Not a very common instrument, but it does exist! |