Is it useful to use six words to calculate wealth? I've only heard of eight characters. What's the difference between six characters and eight characters?

There is no six-word calculation. Eight characters are just a prediction, and eight characters can't guarantee the accuracy of 100%, let alone six words. The horoscope is the year, month, day and time of heavenly stems and earthly branches. The six words are only year, month and day, and some people don't know or can't determine the time. It can only be seen in six words.