Water Intake Calculator
Calculate how much water you should drink daily based on your weight, activity level, and environment.
Coffee, tea, energy drinks
How Much Water Should You Drink Daily?
The general recommendation of “8 glasses a day” is a good starting point, but your actual needs depend on several factors including your body weight, activity level, and environment.
Water Intake by Weight Chart
| Weight (lbs) | Weight (kg) | Sedentary | Active | Very Active |
|---|---|---|---|---|
| 100 | 45 | 1.5L | 1.9L | 2.2L |
| 140 | 64 | 2.1L | 2.6L | 3.1L |
| 180 | 82 | 2.7L | 3.4L | 4.0L |
| 220 | 100 | 3.3L | 4.1L | 4.9L |
Signs You're Not Drinking Enough Water
- Dark yellow urine (should be light yellow)
- Feeling thirsty (you're already dehydrated)
- Fatigue and low energy
- Headaches
- Dry skin and lips
Does Coffee Count Toward Water Intake?
Yes, but only partially. Coffee has a mild diuretic effect, meaning it causes you to lose some water. Studies suggest coffee provides about 80% of its volume in hydration. Our calculator accounts for this with a small adjustment for caffeine consumption.