Calculate how much fluid you need to drink to recover from dehydration based on weight lost.
Enter your values below
Your typical well-hydrated weight.
Based on percentage of body weight lost.
How this calculator works
To rehydrate, drink 1.5 times the fluid you lost. For example, if you lost 1 kg (1 liter), drink 1.5 liters over 2-4 hours. Severe dehydration (>3% body weight loss) requires medical attention.
Common questions about this calculator
Hydration needs vary based on health conditions, medications, and activity levels. Consult a healthcare provider if you have fluid restriction requirements.
