Per pound
How Much Water Should a 290 lb Person Drink?
Quick answer
A 290 lb (132 kg) adult should drink about 4.6 litres (157 fl oz, or 18.5 glasses) of water a day at a moderate activity level in a temperate climate. Needs range from roughly 4.1 litres on a quiet, cool day to about 5.4 litres when active or in heat — add more for exercise, pregnancy, and illness.
Fine-tuneMeasure in bottles · Your day
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Your daily goal: 157 ounces, 18.5 glasses.
Your daily goal
Updates instantlyof water a day · about 18.5 glasses or 9.5 half-litre bottles
Typical range: 145-218 fl oz. Use it as a flexible target, not a medical limit.
Start
3 glasses
7:00 AM
Taper
9:00 PM
for better sleep.
Food fluid
+1.2 L
typical food water
- 4.6
- Litres
- 157
- Ounces
- 18.5
- 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 methodologyCheck personal limits
Use this estimate as a planning note because your inputs include:
- a high daily water goal
Follow clinician guidance first if you have symptoms, fluid limits, kidney/heart concerns, or medication instructions.
Read safety guidanceNext step
Your sip schedule
- 7:00 AM · Start the day3 glasses
- 9:48 AM · Top up3 glasses
- 12:36 PM · Top up3 glasses
- 3:24 PM · Top up3 glasses
- 6:12 PM · Top up3 glasses
- 9:00 PM · Wind down3 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
157 fl oz
The link and preview image include your weight and settings.
How much water is that? A 290 lb breakdown
For a 290 lb (132 kg) adult, the daily drinking goal lands near 4.6 litres (157 fl oz) at a moderate activity level. That's about 18.5 glasses or 9.5 half-litre bottles. On a quiet, cool day you might need as little as 4.1 litres; on an active day in the heat, closer to 5.4 litres.
| Body weight | Litres | Ounces | Glasses |
|---|---|---|---|
| 290 lb | 4.6 | 157 | 18.5 |
| 280 lb | 4.5 | 152 | 18 |
| 300 lb | 4.8 | 162 | 19 |
| 270 lb | 4.3 | 147 | 17.5 |
Where the 290 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 290 lb person therefore lands near 4.6 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 290 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 290 lb person drink a day?
A 290 lb (132 kg) adult should drink about 4.6 litres (157 fl oz) of water a day at a moderate activity level — roughly 18.5 glasses or 9.5 half-litre bottles. That ranges from around 4.1 litres on a quiet, cool day up to about 5.4 litres when you exercise or it's hot.
How many ounces of water is that for 290 lb?
For a 290 lb adult, a moderate day is about 157 fluid ounces (4.6 litres). On a light day you might manage with 139 oz; on an active or hot day you can need 184 oz or more.
Is "half your body weight in ounces" right for 290 lb?
Half your body weight in ounces is 145 oz, a sound floor for a 290 lb adult who sits most of the day. If you're active, pregnant, or in the heat, aim higher — toward 157 oz or more.