Livestock Water Requirement Calculator

A mature beef cow typically drinks about 8-15 gallons per day under normal conditions, with this calculator using 12 gallons/head/day as a representative baseline. Actual intake depends on body size, diet, activity, and especially temperature - intake can run 25-50% higher in hot weather.

Milk is roughly 87% water, so a lactating dairy cow has a substantially higher water turnover than a beef animal that isn't producing milk. This calculator uses 20 gallons/head/day for dairy cattle versus 12 for beef cattle, and high-producing cows in hot weather can need even more.

University extension research on cattle commonly finds a 25-50% increase in water intake during hot weather compared to mild conditions, since animals rely on increased respiration (and evaporative cooling in some species) to shed heat, and they replace that water by drinking more. This calculator applies a 40% increase for the "hot" temperature setting, in the middle of that commonly cited range.

No - this estimates only the animals' drinking requirement. Open troughs and tanks lose additional water to evaporation (more in hot, dry, windy conditions) and to spillage or overflow from float valves, so a real-world water system should be sized with some margin above the drinking-only total this calculator produces.

The terminology is the same idea - "head" and "bird" both just mean one animal - but poultry intake is so much smaller in absolute terms (well under a tenth of a gallon per day) that it's conventionally expressed per bird to avoid confusion with the much larger per-head figures used for cattle, horses, and swine.