The present invention discloses a sitting body fat system for measuring a user's body weight and body fat percentage. The seat body fat system comprises an elastic body, a seat portion, a grip member, a support member, a carrying platform and a Measuring unit. The ride is for the user to ride. The grip is disposed on the seating portion. The grip is for the user to touch. The support member is connected to the seat portion. One side of the carrier is connected to the support and the other side is connected to the elastomer. The elastic body generates a reaction force according to the force applied by the seat portion. The measuring unit connects the grip and the carrying platform. The measuring unit takes the electrical characteristics of the user from the grip to calculate the body fat percentage and obtain a reaction force from the carrier to calculate the body weight.本創作係揭露一種坐式體脂肪系統係測量一使用者的體重與體脂肪率，該坐式體脂肪系統包含彈性體、一乘坐部、一握持件、一支撐件、一承載台與一測量單元。乘坐部供使用者乘坐。握持件設置於乘坐部。握持件供使用者觸碰。支撐件連接乘坐部。承載台之一側連接支撐件與另一側連接彈性體。彈性體根據乘坐部施加的作用力以產生反作用力。測量單元連接握持件與承載台。測量單元自握持件取得使用者的電氣特性以計算出體脂肪率及自承載台取得反作用力以計算出體重。
