Water intake by body weight

How much water should you drink at 140 lb?

Quick answer

At 140 lb (64 kg), the water intake calculator's rule of thumb gives about 2.1 litres (71 oz, 9 cups) a day without exercise in a temperate climate. An hour of exercise in a hot climate takes it to about 3.1 litres (104 oz). It is a planning estimate, not a medical recommendation.

Daily water: 2.1L; 71 oz
In cups: 9cups; 240 ml cups
With 1 hour of exercise: 2.8L
Hot climate, 1 hour: 3.1L

Water at 140 lb by exercise and climate

Daily water for 140 lb (64 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 140 lb (64 kg) by minutes of exercise and climate
Exercise	Temperate, litres	Temperate, oz	Hot, litres	Hot, oz
No exercise	2.1	71	2.3	78
30 minutes	2.5	83	2.7	91
60 minutes	2.8	95	3.1	104
90 minutes	3.2	107	3.5	117
120 minutes	3.5	118	3.9	130

Work it out for your own weight

Every figure here comes from the water intake calculator: 33 ml per kilogram of body weight (64 kg × 33 ml = 2.11 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 2.1 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 2.1 litres for 140 lb is below 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 140 lb, and the difference from this page.

Daily water at weights near 140 lb, and the difference from 140 lb
Body weight	Litres	Ounces	Against 140 lb
120 lb (54 kg)	1.8	61	-0.3 L
130 lb (59 kg)	2.0	66	-0.1 L
150 lb (68 kg)	2.3	76	+0.2 L
160 lb (73 kg)	2.4	81	+0.3 L

Frequently asked questions

How much water should a 140 lb person drink a day?

About 2.1 litres (71 oz, 9 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. 140 lb (64 kg) is 64 kg. It is a planning estimate, and the total counts water from food and other drinks.

How much more at 140 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 2.8 litres (95 oz) in a temperate climate.

Does heat change the amount at 140 lb?

The calculator adds 10% for a hot or humid climate, which makes the no-exercise figure 2.3 litres (78 oz) instead of 2.1.

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.