Fluid Needs Based on Weight

Children weighing under 10 kg require 100 ml of fluid per kilogram of body weight per day:
weight in kg × 100 ml/kg/day = fluid needs in ml/day
Children weighing 10 to 20 kg require 1,000 ml of fluid per day for the first 10 kg plus 50 ml for every kilogram over 10:
(total kg - 10 kg) × 50 ml/kg/day = additional fluid need in ml/day 1,000 ml/day + additional fluid need = fluid needs in ml/day
Children weighing more than 20 kg require 1,500 ml of fluid for the first 20 kg plus 20 ml for each additional kilogram:
(total kg - 20 kg) × 20 ml/kg/day = additional fluid need in ml/day 1,500 ml/day + additional fluid need = fluid needs in ml/day