Tools
Health & Fitness
Water Intake Calculator
How much water you should drink each day.
Activity level
Climate
Daily Guidelines
The 8×8 rule is a myth
The popular "8 cups a day" ignores body weight and activity. Your real needs depend on how much you weigh and move.
| Weight | Oz/day |
|---|---|
| 120 lbs | 60–80 |
| 150 lbs | 75–100 |
| 180 lbs | 90–120 |
| 210 lbs | 105–140 |
Signs you need more water
- · Dark yellow urine
- · Headaches or fatigue
- · Difficulty concentrating
Daily water guide▾
Daily Guidelines
The 8×8 rule is a myth
The popular "8 cups a day" ignores body weight and activity. Your real needs depend on how much you weigh and move.
| Weight | Oz/day |
|---|---|
| 120 lbs | 60–80 |
| 150 lbs | 75–100 |
| 180 lbs | 90–120 |
| 210 lbs | 105–140 |
Signs you need more water
- · Dark yellow urine
- · Headaches or fatigue
- · Difficulty concentrating