Pet Water Intake Calculator

How it is calculated

The tool uses a single fixed rate of 50 mL of water per kilogram of body weight per day: daily water (mL) = weight (kg) × 50. It also shows the same figure in litres, mL ÷ 1000, rounded to two decimals. The millilitre figure is rounded to a whole number. There is no species, diet, age or temperature input, so the result is a baseline for a healthy adult animal on a mixed diet. Wet food, hot weather, hard exercise, pregnancy and illness all change real intake. A weight of zero or less gives no result. Weight must be entered in kilograms.

Common mistakes

• Typing the weight in pounds. The rate is per kilogram, so a 25 lb dog is about 11.3 kg, and entering 25 more than doubles the result.
• Treating the result as a limit. It is a typical amount, and a pet may drink more on a hot day or after exercise without any problem.
• Ignoring water in food. A cat on wet food drinks much less from the bowl than the total suggests.
• Reading the litre figure as exact. It is rounded to two decimals, so 0.63 L is really 625 mL.
• Using the estimate to decide whether a pet is ill. A persistent change from its own normal pattern is a reason to call a vet, not the calculator's number.