Oral Rehydration Solution (ORS) is a glucose-electrolyte solution used to prevent and treat dehydration caused by diarrhea, vomiting, or excessive sweating. ORS has saved millions of lives globally and is the cornerstone of pediatric diarrhea management in India and worldwide. The current WHO-recommended formulation is low-osmolarity ORS (245 mOsm/L), which contains sodium 75 mmol/L, glucose 75 mmol/L, potassium 20 mmol/L, citrate 10 mmol/L, and chloride 65 mmol/L.

In India, ORS is sold under brand names like Electral, Walyte, Pedialyte, Enerzal, Bisleri ORS, and Sanofi ORS. Each sachet is reconstituted in 200 mL of clean drinking water (some Indian formulations require 1 litre — always read the label).

Plan A (No dehydration): Home management. Give extra ORS after every loose stool. Children <2 years: 50-100 mL per stool. Children 2-10 years: 100-200 mL per stool. Continue regular feeding including breastfeeding.

Plan B (Some dehydration / Mild-Moderate): Supervised rehydration in a clinic. Give 75 mL/kg of ORS over 4 hours. Reassess every hour. If improving, switch to Plan A.

Plan C (Severe dehydration): IV fluids urgently — Ringer's Lactate or Normal Saline. Bolus 30 mL/kg over 30-60 minutes (infants over 1 hour), then 70 mL/kg over 2.5-5 hours. Add ORS as soon as the child can drink.

This pediatric ORS calculator follows the latest WHO and Indian Academy of Pediatrics (IAP) standard treatment guidelines used by general practitioners, pediatricians, and emergency physicians across India — from primary health centres in rural Bihar to corporate hospitals in Bangalore, Mumbai, Delhi, Chennai, Hyderabad, Kolkata, and Pune.

Whether you're managing acute gastroenteritis in a 2-year-old with mild dehydration or an infant with severe diarrhea requiring hospital admission, this calculator provides evidence-based ORS volume recommendations in seconds.