Daily Water Intake Calculator – How Much Water Should You Drink?

Wondering how much water you should drink each day? Our Daily Water Intake Calculator will estimate your ideal hydration needs. Proper water intake is crucial for health – it supports digestion, keeps your skin healthy, aids circulation, and prevents dehydration. Yet requirements vary by person. This calculator uses your body weight to suggest a daily water goal.

How it works: A common guideline is to drink about 30–35 ml of water per kilogram of body weight (or roughly ½ oz per pound). Our calculator applies this rule. For example, a 70 kg (154 lb) person might need ~2.4 liters of fluids daily as a baseline. Keep in mind this includes all sources of water (beverages and food). If you exercise or live in a hot climate, your needs will be higher. The calculator provides a starting point, and you can adjust for your lifestyle:

• Exercise: Add around 12 oz (350 ml) of water for every 30 minutes of intense activity.
• Hot weather: You may need an extra 1–2 cups (250–500 ml) on very hot days to make up for sweat.
• Pregnant/Breastfeeding: Higher intake is recommended (consult guidelines or your doctor).

Always listen to your body: thirst is a helpful indicator​. And remember, drinking more water is generally beneficial, but don’t overdo it – extremely high intake in a short time can lead to water intoxication. For most people, drinking when thirsty and aiming for the recommended amount will keep you safely hydrated.

Use the tool below to find your personalized daily water goal. Staying adequately hydrated can boost energy, improve concentration, and even aid weight management. Cheers to good hydration!