The overall weight of badminton rackets can vary from 65 grams to 95 grams. Which you choose can come down to personal preference.
Generally, lighter rackets – require better technique to generate power. It is not always beneficial to go with the lightest racket. Average weighted rackets are 85-90g. The difference between Yonex 3U and 4U rackets is around 3-4g.
Most elite players will play with a racket no lighter than 80g.