Water intake by body weight

How much water should you drink at 180 lb?

Quick answer

At 180 lb (82 kg), the water intake calculator's rule of thumb gives about 2.7 litres (91 oz, 11 cups) a day without exercise in a temperate climate. An hour of exercise in a hot climate takes it to about 3.7 litres (126 oz). It is a planning estimate, not a medical recommendation.

Daily water: 2.7L; 91 oz
In cups: 11cups; 240 ml cups
With 1 hour of exercise: 3.4L
Hot climate, 1 hour: 3.7L

Water at 180 lb by exercise and climate

Daily water for 180 lb (82 kg) by minutes of exercise, in a temperate climate and a hot or humid one. Read down to the row that fits your day.

Daily water for 180 lb (82 kg) by minutes of exercise and climate
Exercise	Temperate, litres	Temperate, oz	Hot, litres	Hot, oz
No exercise	2.7	91	3.0	100
30 minutes	3.0	103	3.4	113
60 minutes	3.4	115	3.7	126
90 minutes	3.7	126	4.1	139
120 minutes	4.1	138	4.5	152

Work it out for your own weight

Every figure here comes from the water intake calculator: 33 ml per kilogram of body weight (82 kg × 33 ml = 2.71 litres before rounding), plus 350 ml for every 30 minutes of exercise, plus 10% in a hot climate, rounded to the nearest 10 ml. Use it to enter your own weight in kilograms or pounds, your minutes of exercise and your climate.

It is a rule of thumb, and there is no single official requirement. The calculator counts water from food and other drinks as well as from the glass.

How 2.7 litres compares with the reference intake

The Institute of Medicine's Adequate Intake of total water, from all drinks and all food, is 2.7 litres a day for women and 3.7 litres for men aged 19 to 30. The 2.7 litres for 180 lb is equal to the women's figure and below the men's. About one fifth of total water intake comes from food, according to the same report, so the glass is not the whole of it.

Nearby body weights

The no-exercise, temperate figure for the weights either side of 180 lb, and the difference from this page.

Daily water at weights near 180 lb, and the difference from 180 lb
Body weight	Litres	Ounces	Against 180 lb
160 lb (73 kg)	2.4	81	-0.3 L
170 lb (77 kg)	2.5	86	-0.2 L
190 lb (86 kg)	2.8	96	+0.1 L
200 lb (91 kg)	3.0	101	+0.3 L

Frequently asked questions

How much water should a 180 lb person drink a day?

About 2.7 litres (91 oz, 11 cups of 240 ml) on a day without exercise in a temperate climate, from the calculator's rule of thumb of 33 ml per kilogram of body weight. 180 lb (82 kg) is 82 kg. It is a planning estimate, and the total counts water from food and other drinks.

How much more at 180 lb if I exercise?

The calculator adds 350 ml for every 30 minutes of exercise, so an hour adds 0.7 litres and takes the figure to 3.4 litres (115 oz) in a temperate climate.

Does heat change the amount at 180 lb?

The calculator adds 10% for a hot or humid climate, which makes the no-exercise figure 3.0 litres (100 oz) instead of 2.7.

Is this a medical recommendation?

No. There is no single official water requirement, and the calculator's rule is a planning estimate. People with a heart or kidney condition, or on medicines that affect fluid balance, should ask their doctor how much is right for them.

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An estimate from a rule of thumb, not medical advice. If you have a heart or kidney condition or take medicine that affects fluid balance, ask your doctor how much water is right for you.