Daily Water Intake Calculator - Hydration by Weight, Climate & Exercise
Calculate your personalized daily hydration requirement based on body mass, climate temperature, exercise duration, and pregnancy/lactation factors. 100% private in-browser health cockpit.
Active Daily Hydration Status76% of 4L Scale
Click glasses below to log today's fluid consumption in browser
Target drinking water, herbal teas, infused water, and electrolyte beverages throughout the day.
Moisture naturally absorbed from fruits (watermelon, oranges), crisp vegetables, and soups.
| Hydration Factor | Clinical Rationale | Volume (ml) | Cups (8 oz) |
|---|---|---|---|
| Baseline Weight Need | 35 ml × 70 kg body weight | 2450 ml | 9.8 |
| Exercise Sweat Loss | 45 mins at moderate intensity | +563 ml | +2.3 |
| Total Daily Fluid Goal | Rounded to nearest 25 ml | 3025 ml | 12 Cups |
NASEM Clinical Weight-to-Fluid Matrix & Scenario Comparisons
Standard hydration requirements mapped across body mass brackets from 45 kg (99 lbs) to 115 kg (254 lbs).
| Body Weight | Sedentary Base | +30m Moderate Workout | In Hot Climate | Daily Liters | Standard Cups |
|---|---|---|---|---|---|
| 45 kg / 99 lbs | 1575 ml | +1950 ml | 2400 ml | 2.40 L | 9.6 |
| 50 kg / 110 lbs | 1750 ml | +2125 ml | 2575 ml | 2.58 L | 10.3 |
| 55 kg / 121 lbs | 1925 ml | +2300 ml | 2750 ml | 2.75 L | 11.0 |
| 60 kg / 132 lbs | 2100 ml | +2475 ml | 2925 ml | 2.92 L | 11.7 |
| 65 kg / 143 lbs | 2275 ml | +2650 ml | 3100 ml | 3.10 L | 12.4 |
| 70 kg / 154 lbsYour Weight | 2450 ml | +2825 ml | 3275 ml | 3.27 L | 13.1 |
| 75 kg / 165 lbs | 2625 ml | +3000 ml | 3450 ml | 3.45 L | 13.8 |
| 80 kg / 176 lbs | 2800 ml | +3175 ml | 3625 ml | 3.63 L | 14.5 |
| 85 kg / 187 lbs | 2975 ml | +3350 ml | 3800 ml | 3.80 L | 15.2 |
| 90 kg / 198 lbs | 3150 ml | +3525 ml | 3975 ml | 3.98 L | 15.9 |
| 95 kg / 209 lbs | 3325 ml | +3700 ml | 4150 ml | 4.15 L | 16.6 |
| 100 kg / 220 lbs | 3500 ml | +3875 ml | 4325 ml | 4.33 L | 17.3 |
| 105 kg / 231 lbs | 3675 ml | +4050 ml | 4500 ml | 4.50 L | 18.0 |
| 110 kg / 243 lbs | 3850 ml | +4225 ml | 4675 ml | 4.67 L | 18.7 |
| 115 kg / 254 lbs | 4025 ml | +4400 ml | 4850 ml | 4.85 L | 19.4 |
This calculator implements generalized NASEM healthy adult fluid guidelines. If you have been clinically diagnosed with Congestive Heart Failure (CHF), Chronic Kidney Disease (CKD/ESRD), Liver Cirrhosis, or Syndrome of Inappropriate Antidiuretic Hormone (SIADH), strictly follow your nephrologist or cardiologist's prescribed fluid restriction orders. Never force fluid beyond your physiological thirst or kidney excretion capacity.
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