Calculate your recommended daily water intake based on body weight, climate, and physical exercise level. Keep hydrated and track your health goals.
Staying properly hydrated is essential for digestion, joint lubrication, temperature regulation, and optimal cognitive performance. Our free online Water Intake Calculator calculates your baseline daily fluid requirements and adjusts the target based on your physical activity and the climate you live in.
The baseline hydration calculation is based on the standard rule of drinking half your body weight in ounces daily (or approximately 30-35 ml per kg of body weight). The calculator adds extra water requirements to compensate for fluids lost through sweat during exercise, helping you prevent dehydration.
A common baseline is to drink about half your body weight in ounces daily (e.g., if you weigh 160 lbs, aim for 80 ounces of water). Alternatively, the standard recommendation is about 3.7 liters (125 oz) for men and 2.7 liters (91 oz) for women, including all beverages and food moisture.
It is recommended to drink an additional 12 to 20 ounces (approx. 350 to 600 ml) of water for every 30 minutes of intense exercise to replace fluids lost through sweat.
Signs of mild dehydration include dark-colored urine, dry mouth, thirst, fatigue, headaches, dizziness, and mild muscle cramps.
Yes, drinking excessive amounts of water in a short time can lead to hyponatremia (water intoxication), a condition where blood sodium levels drop dangerously low, causing swelling in cells. Drink water gradually throughout the day.