Voiding Diary Bladder Capacity Calculator

Determine functional bladder capacity from a 3-day voiding diary. Functional capacity is the maximum single void volume recorded. Normal functional bladder capacity is 300-500 mL. Reduced capacity below 200 mL suggests detrusor overactivity, bladder fibrosis, or interstitial cystitis.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Determine functional bladder capacity from a 3-day voiding diary. Functional capacity is the maximum single void volume recorded. Normal functional bladder capacity is 300-500 mL. Reduced capacity below 200 mL suggests detrusor overactivity, bladder fibrosis, or interstitial cystitis

Each component has a specific meaning:

  • 3-day voiding diary — The 3-day voiding diary recorded for the scenario being assessed.

Note: Interpret the bladder capacity (diary) result against the thresholds and context described above.

How to Use

Enter the 3-day voiding diary for the scenario you are assessing. Determine functional bladder capacity from a 3-day voiding diary. Functional capacity is the maximum single void volume recorded. Normal functional bladder capacity is 300-500 mL. Reduced capacity below 200 mL suggests detrusor overactivity, bladder fibrosis, or interstitial cystitis. Use the bladder capacity (diary) result to inform your calculation.

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Frequently Asked Questions