Normal Urine Output in 24 Hours: How Much Should You Pass a Day?

The short answer: an adult normally passes 1,200 to 2,000 ml of urine in 24 hours, across four to eight voids. Measured against body weight, anything under 40 ml per kilogram per day is considered ordinary.

Everything else is context — the full table, what that works out at per hour, why your output is almost always less than what you drink, and the point at which a figure is worth taking to a doctor.

The reference ranges

Output per kilogram of body weight

Absolute millilitres do not suit every body, which is why urology often scales output to weight. The threshold for polyuria is passing more than about 40 ml per kilogram of body weight in 24 hours:

• 60 kg → polyuria above roughly 2,400 ml a day
• 70 kg → polyuria above roughly 2,800 ml a day
• 80 kg → polyuria above roughly 3,200 ml a day
• 90 kg → polyuria above roughly 3,600 ml a day

Past the threshold, the question moves from the bladder to urine production — and the commonest cause is the drinking itself. Someone who gets through three litres will pass close to three litres; that is arithmetic, not a symptom. High output only becomes medically interesting when it arrives without matching intake, or alongside unusual thirst and weight loss.

Output per hour

From 1,200-2,000 ml a day the arithmetic gives roughly 50 to 80 ml an hour, or about 1 ml per kilogram of body weight per hour at rest. That figure is only an average across an uneven day, though: the kidneys produce more while you are awake, and at night antidiuretic hormone cuts production sharply so that sleep is not interrupted.

When that overnight drop fails, the result is nocturnal polyuria — the 24-hour total is normal, but too large a share of it arrives at night. That is why a bladder diary looks at the night-time share and not just the daily total, and it is the reason two people with identical daily output can have completely different nights.

Daily total or per void?

The two figures answer different questions, and conflating them produces wrong conclusions:

An example: ten voids of 200 ml makes 2,000 ml, a normal daily total produced by a bladder that signals early. Five voids of 400 ml also makes 2,000 ml, and there the bladder is behaving unremarkably. Same total, different situations. The per-void ranges are set out in Normal Urine Volume Per Void, and how often is normal in Normal Urination Patterns.

Women and men

The reference ranges do not differ in any meaningful way: 1,200-2,000 ml a day applies to both. Where differences show up, they track body weight and drinking habits rather than sex — which is also why the per-kilogram calculation is more informative than a fixed limit in millilitres. What differs is the usual cause when something is off: prostate enlargement and residual urine in men, and the pelvic floor, pregnancy, menopause and urinary tract infection in women.

Why intake and output never match

Roughly 500 to 800 ml of fluid leaves the body every day without ever becoming urine: through exhaled air, through the skin, and in stool. These insensible losses climb steeply in hot weather or during exercise, and a litre more on a heavily sweating day is unremarkable.

So a gap of that size is the norm. It becomes notable in two directions. A very small gap usually means drinks went unrecorded. A persistently very large one can point — beyond sweating — to fluid retention or incomplete bladder emptying, and the last of those deserves assessment, because the volumes you measure then differ from the volume actually produced. The full picture is in Bladder Diary Intake vs Output.

How to measure a 24-hour total at home

Start the collection after the first void of the morning and finish with the first void of the following morning. That way the period covers exactly 24 hours and no void is counted twice — the single most common mistake when people try this. Measure every void with a jug or a collection container and record the time alongside the volume, which turns the total into a bladder diary that also shows the night-time share.

The four practical methods, and how accurate each one is, are in How to Measure Urine Volume at Home. One full day gives you a total; three days give you a pattern, which is what the bladder diary guide covers.

When to get output checked

• Clearly increased output alongside unusual thirst or weight loss
• Output consistently under about 400-500 ml a day despite normal drinking
• Blood in the urine — any amount, even once, even without pain
• Burning or pain on passing urine, especially with fever or back pain
• A sense that the bladder does not empty fully
• A sudden change in volumes over days rather than months
• Swollen legs or breathlessness alongside a change in output