If you haven’t done so check out the full post on Bladder Ultrasound HERE!
It shows you how to assess the bladder properly using ultrasound in a step by step fashion.
Bladder Volume Ultrasound Calculator:
A simple formula to remember and use is Width x Depth x Height x 0.7. However, if you want more accurate bladder volume estimates use the bladder volume calculator we made that takes into account different bladder shapes. This calculator will help you accurately detect your patient’s Bladder Volume Calculation using ultrasound (Bih et al).
The formula used to calculate bladder volume is Width x Depth x Height x Correction Coefficient. The table below shows you the correction coefficient for each of the bladder shapes.
| Bladder Shape | Correction Coefficient |
| Unknown | 0.72 (most commonly used) |
| Triangular prism | 0.66 |
| Cylinder (Ellipsoid) | 0.81 |
| Cuboid | 0.89 |
| Spherical | 0.52 |
Bih, L., Ho, C., Tsai, S., Lai, Y., Chow, W. (1998). Bladder shape impact on the accuracy of ultrasonic estimation of bladder volume Archives of Physical Medicine and Rehabilitation 79(12), 1553-1556. https://dx.doi.org/10.1016/s0003-9993(98)90419-1
