Water intake by body weight

How much water should you drink at 240 lb?

Quick answer

At 240 lb (109 kg), the water intake calculator's rule of thumb gives about 3.6 litres (121 oz, 15 cups) a day without exercise in a temperate climate. An hour of exercise in a hot climate takes it to about 4.7 litres (160 oz). It is a planning estimate, not a medical recommendation.

Daily water: 3.6L; 121 oz
In cups: 15cups; 240 ml cups
With 1 hour of exercise: 4.3L
Hot climate, 1 hour: 4.7L

Water at 240 lb by exercise and climate

Daily water for 240 lb (109 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 240 lb (109 kg) by minutes of exercise and climate
Exercise	Temperate, litres	Temperate, oz	Hot, litres	Hot, oz
No exercise	3.6	121	4.0	134
30 minutes	3.9	133	4.3	147
60 minutes	4.3	145	4.7	160
90 minutes	4.6	157	5.1	173
120 minutes	5.0	169	5.5	186

Work it out for your own weight

Every figure here comes from the water intake calculator: 33 ml per kilogram of body weight (109 kg × 33 ml = 3.60 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 3.6 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 3.6 litres for 240 lb is above 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 240 lb, and the difference from this page.

Daily water at weights near 240 lb, and the difference from 240 lb
Body weight	Litres	Ounces	Against 240 lb
210 lb (95 kg)	3.1	106	-0.5 L
220 lb (100 kg)	3.3	111	-0.3 L
230 lb (104 kg)	3.4	116	-0.2 L
250 lb (113 kg)	3.7	126	+0.1 L

Frequently asked questions

How much water should a 240 lb person drink a day?

About 3.6 litres (121 oz, 15 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. 240 lb (109 kg) is 109 kg. It is a planning estimate, and the total counts water from food and other drinks.

How much more at 240 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 4.3 litres (145 oz) in a temperate climate.

Does heat change the amount at 240 lb?

The calculator adds 10% for a hot or humid climate, which makes the no-exercise figure 4.0 litres (134 oz) instead of 3.6.

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.