Bladder Volume Calculator (Ultrasound)

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Pre-void: the total urine in the bladder before urinating. Post-void: urine remaining after urinating (used to detect incomplete emptying).
The correction coefficient compensates for bladder shape. When the shape is not assessed, 0.72 is the commonly used default (Bih et al., 1998).
The longest dimension of the bladder, measured on the sagittal (longitudinal) view.
cm
The widest left-to-right dimension, measured on the transverse view.
cm
The front-to-back depth of the bladder, measured on the transverse or sagittal view.
cm
Bladder volumeNormal range
272mL

Estimated urine volume in millilitres

Volume (fl oz)9.2fl oz
Correction coefficient0.72
272 mL
Minimal<50Normal range50-400Near capacity400-600Over capacity600+

Estimated bladder volume: 272 mL (9.2 fl oz).

  • 272 mL is within the normal adult comfortable capacity range (150-400 mL).
  • A correction coefficient of 0.72 was used for the unknown shape. Measurement error with the 3D ellipsoid formula is approximately 12-15%.
  • Dimensions were entered in cm. Always correlate ultrasound estimates with clinical findings.

Next stepFor postvoid residual assessment, remeasure after the patient voids and switch to PVR mode above.

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