A typical adult human bladder can comfortably hold about 400 to 600 milliliters (ml) of urine before signaling the need to urinate. On average, people start feeling the urge to pee when their bladder contains between 150 and 300 ml, but the bladder can stretch to hold more if necessary, sometimes up to 900 to 1500 ml in extreme cases

. More specifically:

• Women’s bladders typically hold up to about 500 ml.
• Men’s bladders can hold slightly more, around 700 ml on average

• The normal urge to urinate usually begins when the bladder is about one-quarter full, roughly 150-250 ml

• The bladder is elastic and expands like a balloon as it fills

• It is generally recommended to empty the bladder every 3 to 4 hours, which corresponds to about 300-500 ml of urine

In summary, while the bladder’s capacity varies by individual and sex, a healthy adult bladder usually holds around half a liter of urine comfortably before the urge to urinate becomes strong. Holding urine beyond this capacity for prolonged periods is not advisable as it can lead to health issues