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Estimates bladder volume from three ultrasound measurements (length, width, height, in cm) using the standard published ellipsoid formula: Volume (mL) = Length x Width x Height x 0.72, a coefficient widely cited in bladder ultrasound/scanning literature (values in the 0.52-0.75 range have been reported depending on the specific formula or device; 0.72 is the most commonly cited general-purpose coefficient). For general reference and educational purposes only — not a medical diagnosis. Consult a doctor for actual bladder volume assessment.
How it works
Enter the length, width, and height of the bladder in centimeters from an ultrasound. The tool multiplies the three dimensions by the standard 0.72 coefficient.
- Enter length (cm).
- Enter width (cm).
- Enter height (cm).
- Click Calculate to see your results.
Examples
Length 10 cm, width 6 cm, height 7 cm
Volume = 10 x 6 x 7 x 0.72 = 302.4 mL.
Who should use it
- Estimating post-void residual volume from ultrasound measurements.
- Urology and nursing education about bladder volume assessment.
Industry applications
- Urology and nursing reference
- Point-of-care ultrasound education
Advantages
- Simple, widely cited formula.
- Useful when only a manual ultrasound (not a dedicated bladder scanner) is available.
Limitations
- Less precise than a dedicated automatic bladder scanner.
- Coefficient varies somewhat across published formulas and devices (0.52-0.75).
Common mistakes to avoid
- Using measurements from different scan planes that do not represent true orthogonal length/width/height.
- Confusing bladder wall thickness measurements with the volume dimensions.
Best practices
- Use the three orthogonal dimensions (length, width, height) as reported by the ultrasound for the most representative estimate.
Tips
- Post-void residual is typically measured shortly after voiding for a meaningful clinical estimate.