1 Most gyms offer monthly memberships for between $20-$50 per month. 2  This gym membership cost depends on the quality of the club, such as what types of facilities are offered, as well as the cost of living in you area.3  Most gyms also offer yearly memberships instead of monthly – these usually cost between $200 and $500. This is usually the best value for two or more people. 2  Some gyms require you to sign a contract for a specific amount of time while other gyms do not. 3  According to this FatWallet thread, the average gym membership cost can range anywhere from $17 to $60.