Calculate your recommended daily water intake based on body weight, activity level, and climate. Results in litres and fluid ounces.
Enter your body weight, select your typical activity level, and indicate your climate. The calculator uses a weight-based formula adjusted for activity and heat to give a personalised daily water target in both litres and US fluid ounces. This is a guideline — individual needs vary based on health, diet, and other factors.
Enter your body weight, choose kg or lb, select your activity level from the dropdown, and pick your typical climate. Your recommended daily water intake updates immediately.
No — the result is for drinking water only. Food typically contributes 20–30% of daily water intake, so your total hydration from all sources will be higher.
Vigorous exercise for 60+ minutes per day, or physically demanding work throughout the day. Moderate activity covers 30–60 minutes of exercise, and light is a typical office day with a short walk.
Yes, caffeinated drinks contribute to hydration despite mild diuretic effects. However, plain water remains the best source.
This tool runs entirely in your browser. Nothing you type or paste is sent to any server — all processing happens locally on your device.