bo - staff (usually 6 shaku if unqualified) jo - staff (usually 4 shaku, but may be any size) There are numerous examples of bo and jo in martial arts, and sizes vary.
The legends never explain how he chose four shaku, two sun, one bu as the proper length for the staff. The jo is as short as it can be, while still being definitely longer than a sword.

Traditionally, the hanbō was approximately three shaku or about 90 centimetres (35 in) long, half the length of the usual staff, the rokushakubō ("six shaku staff"). That’s the answer – the jo is long enough to outreach a sword. If you are unhappy with your purchase, send it back within 10 days and we will give you a full refund!
This is a 60.75″ solid Ipe jo staff. So, why is the jo the length that it is? The Jo staff of Muso Gonnosuke's design and the one used in his school, Shinto Muso Ryu, is 50 1/4" in length with a diameter of 15/16". However, many modern products still use the term "bo" to describe this length. The reason the Bo Staff is one of favorite martial arts weapons, is it provides such great reach and is an excellent tool to keep your armed (sword, knife, bat) assailant away from you. The hanbō (半棒, "half-staff") is a staff used in martial arts. I get asked, quite often how to pick the correct Bo Staff for training. Approximately 1 inch in diameter. Length: As sport karate competitor and Team Paul Mitchell member Jackson Rudolph explains in this video, the correct length for your bo staff depends on your height. Bo means "staff" and generally refers to a weapon about six shaku in length, or six feet, or thereabouts, and one sun in diameter. The jo staff comes in at an overall length of 4’ This is a must-have training quality tool for the serious martial artist or martial arts school The staff is constructed of high impact-resistant black polypropylene with almost unbreakable toughness

1 Jo, meaning "stick" or "cudgel" are shorter weapons and do not have a standard length or diameter, as size depends on the particular ryu. If your staff is 6 feet or longer its a bo, if its shorter than that its a bo.

Jo Staff Solid Ipe Length: 60 inch Round 1.25 inch Diameter. We also work to ensure that all of our staffs are top quality, whether they are the five and six foot length bo staffs, the four-foot jo staff, or even the three-foot hanbo. The ideal length for the jo staff. The jo which is shorter than the bo and from what I know, generally speaking, 6 feet is the cutoff point.

It weighs 2.86 lbs and is straight as an arrow. Note: The most traditional length for a jo … As a general rule of thumb, when stood upright on the ground, your bo should be about the same height as you.