Devices, systems and methods are provided for facilitating knee balancing during a knee replacement surgery. A system can include a force sensor, a main body, a moveable sensor platform, and an adjustment mechanism. The force sensor can sense one or more forces applied within a knee joint, including forces applied on a medial side and a lateral side. The movable sensor platform can be coupled between the force sensor and the main body. The adjustment mechanism can adjust the moveable sensor platform, relative to the main body, thereby adjusting a collective height of the system. A method can include inserting portions of a knee balancing system into a gap formed between a cut distal end of a femur and a cut proximal end of a tibia, adjusting an adjustable mechanism of the system to increase or decrease a collective system height, and sensing and displaying the medial and lateral forces.