Bladder Volume Calculator
Calculate precise bladder volume from ultrasound measurements for clinical assessment
Bladder Measurements
Maximal transverse dimension
Anterior-posterior dimension
Longitudinal dimension
Bladder Volume Results
Enter bladder dimensions to calculate volume
Example Calculation
Clinical Example
Patient: Adult with suspected bladder dysfunction
Ultrasound measurements:
• Width (transverse): 6 cm
• Height (anterior-posterior): 9 cm
• Length (longitudinal): 7 cm
Shape: Irregular/Unknown (coefficient: 0.77)
Calculation
Volume = Width × Height × Length × Coefficient
Volume = 6 × 9 × 7 × 0.77
Volume = 378 × 0.77
Volume = 291.1 ml
Result: Normal adult bladder capacity
Shape Coefficients
Normal Bladder Capacity
Adults
300-500 ml
Normal functional capacity
Maximum Capacity
600-800 ml
Before discomfort occurs
Children
(Age + 2) × 30 ml
Age-based formula
Ultrasound Methods
Transabdominal
Through abdominal wall
Transvaginal
Via intravaginal probe
Transrectal
Via intrarectal probe
Medical Disclaimer
This calculator is for educational and clinical reference purposes only. Bladder volume calculations should always be interpreted by qualified healthcare professionals in the context of complete clinical assessment and patient history.
Important: This tool provides estimates with an approximate 12.7% margin of error. Abnormal results require professional medical evaluation. Do not use for self-diagnosis or treatment decisions.
Understanding Bladder Volume Assessment
What is Bladder Volume Measurement?
Bladder volume measurement using ultrasound is a non-invasive method to assess bladder capacity, post-void residual volume, and overall bladder function. It's essential for diagnosing and monitoring various urological conditions.
Clinical Applications
- •Post-void residual assessment
- •Bladder dysfunction evaluation
- •Urinary retention diagnosis
- •Treatment monitoring
Measurement Accuracy
Formula Precision
The standard formula (Volume = Width × Height × Length × Coefficient) provides clinically acceptable accuracy with approximately 12.7% mean error.
Shape Importance
Correct shape identification is crucial for accurate volume calculation. When shape is uncertain, the "irregular" coefficient (0.77) provides a reasonable estimate.
Clinical Considerations
- • Measurement technique affects accuracy
- • Patient positioning influences results
- • Multiple measurements improve reliability
- • Clinical correlation always required