Per pound
How Much Water Should a 240 lb Person Drink?
Quick answer
A 240 lb (109 kg) adult should drink about 3.9 litres (132 fl oz, or 15.5 glasses) of water a day at a moderate activity level in a temperate climate. Needs range from roughly 3.4 litres on a quiet, cool day to about 4.6 litres when active or in heat — add more for exercise, pregnancy, and illness.
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Your daily goal: 132 ounces, 15.5 glasses.
Your daily goal
Updates instantlyof water a day · about 15.5 glasses or 8 half-litre bottles
Typical range: 120-180 fl oz. Use it as a flexible target, not a medical limit.
Start
2.5 glasses
7:00 AM
Taper
9:00 PM
for better sleep.
Food fluid
+1.0 L
typical food water
- 3.9
- Litres
- 132
- Ounces
- 15.5
- Glasses
Why this number
We start from a weight-based range, then adjust the point estimate for activity, climate, life stage, and GLP-1 settings. Food water is shown separately so the drink goal stays actionable.
Full methodologyNext step
Your sip schedule
- 7:00 AM · Start the day2.5 glasses
- 9:48 AM · Top up2.5 glasses
- 12:36 PM · Top up2.5 glasses
- 3:24 PM · Top up2.5 glasses
- 6:12 PM · Top up2.5 glasses
- 9:00 PM · Wind down2.5 glasses
Ease off after 9:00 PM for better sleep.
Electrolytes? Skip them today
For everyday hydration, plain water and a normal diet cover your electrolytes just fine.
A friendly estimate for healthy adults, not medical advice. Your needs rise with heat, exercise, illness, pregnancy, and some medications. Don't drink more than ~1 litre per hour.
Daily goal
132 fl oz
The link and preview image include your weight and settings.
How much water is that? A 240 lb breakdown
For a 240 lb (109 kg) adult, the daily drinking goal lands near 3.9 litres (132 fl oz) at a moderate activity level. That's about 15.5 glasses or 8 half-litre bottles. On a quiet, cool day you might need as little as 3.4 litres; on an active day in the heat, closer to 4.6 litres.
| Body weight | Litres | Ounces | Glasses |
|---|---|---|---|
| 240 lb | 3.9 | 132 | 15.5 |
| 230 lb | 3.7 | 127 | 15 |
| 250 lb | 4 | 137 | 16 |
| 220 lb | 3.6 | 121 | 14.5 |
| 260 lb | 4.2 | 142 | 17 |
Where the 240 lb number comes from
The baseline is roughly 0.5–0.75 ounces of water per pound of body weight, the widely cited rule of thumb backed by the U.S. National Academies and EFSA. A 240 lb person therefore lands near 3.9 litres before we layer on activity and climate.
The number above assumes a moderately active day in a temperate climate. Add about 350 ml (12 oz) for every half-hour of exercise, and around 10% more in hot or humid weather. Pregnancy, breastfeeding, fever, and some medications push it higher still. The calculator above adjusts all of this live — try it.
Don't drink it all at once
Your kidneys can clear only about 1 litre of water per hour. Spreading the goal across the day — and easing off in the last two hours before bed — keeps you comfortable and avoids nighttime bathroom trips. Pale yellow urine is a good everyday check that you're in the right zone.
Make it exact for 240 lb
Add your real activity, climate, and life stage to dial in a goal made for you — not just your weight.
Frequently asked
How much water should a 240 lb person drink a day?
A 240 lb (109 kg) adult should drink about 3.9 litres (132 fl oz) of water a day at a moderate activity level — roughly 15.5 glasses or 8 half-litre bottles. That ranges from around 3.4 litres on a quiet, cool day up to about 4.6 litres when you exercise or it's hot.
How many ounces of water is that for 240 lb?
For a 240 lb adult, a moderate day is about 132 fluid ounces (3.9 litres). On a light day you might manage with 115 oz; on an active or hot day you can need 156 oz or more.
Is "half your body weight in ounces" right for 240 lb?
Half your body weight in ounces is 120 oz, a sound floor for a 240 lb adult who sits most of the day. If you're active, pregnant, or in the heat, aim higher — toward 132 oz or more.