Dehydration occurs when your body loses more fluids than you take in, disrupting normal functions. This calculator provides an estimate of your fluid deficit (in litres) and the percentage of body water loss based on weight, age, symptoms, and additional stress factors like fever or exercise. It uses a medically‑informed algorithm: mild dehydration corresponds to ~4% loss, moderate ~7%, severe ~10%, adjusted by weight and multiplied by a loss factor. For example, a 70 kg adult with moderate symptoms has an approximate deficit of 70 kg × 0.07 = 4.9 litres. The tool further refines this by factoring in age (children and elderly have higher water percentage, but we apply a gentle correction) and the selected loss factor.
Knowing your dehydration level is crucial for athletes, people in hot climates, or those with illness. Early signs include thirst and dry mouth; moderate stages bring fatigue, dizziness, and reduced urine output; severe dehydration is a medical emergency. The calculator also suggests a safe rehydration range — typically 1 to 1.5 times the deficit over several hours, because drinking too fast can be dangerous. We advise sipping oral rehydration solutions or water with electrolytes, especially after heavy sweating. Always consult a healthcare provider for persistent symptoms.
This tool is designed for educational and wellness purposes. The algorithm integrates WHO rehydration guidelines and pediatric fluid management principles. Remember that individual fluid needs vary based on metabolism, climate, and activity. Use the calculator regularly to stay aware of your hydration status — it’s a simple step toward better health. The numbers are estimates, not a substitute for professional medical advice. Stay hydrated!
