How to Measure Bladder On Ultrasound | Bladder Length, Width, Height & Volume Measurements USG Bladder Measurements: Height (or AP): The measurement from the anterior to the posterior wall of the bladder. Width: Refers to the transverse measurement (from one side of the bladder wall to the opposite side). Length: Refers to the cranio-caudal measurement (from the bladder base to the bladder dome). Calculate bladder volume using the ellipsoid formula: Bladder Volume (ml)=Length (cm)×Width (cm)×Hei