Livestock Water Requirement Calculator
Estimate the daily drinking-water requirement of a dairy animal from its body weight and milk yield.
Cattle need about 5 L water per 100 kg body weight for maintenance plus ~3 L per litre of milk, rising ~30% in hot weather. Water is the cheapest input and the first limiter of milk yield — never ration it; provide clean, cool water free-choice.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Dairy and livestock farmers use the free Livestock Water Requirement Calculator for an accurate answer in seconds — no formulas to remember, works offline at the farm.
About Livestock Water Requirement Calculator
Water is the most overlooked dairy input — yet milk is ~87% water, and even mild water restriction cuts yield faster than any feed shortage. This tool estimates a dairy animal's daily drinking-water need from its body weight, milk yield and the weather, showing how much extra heat adds. The message is simple: clean, cool water should always be available free-choice, because it is the cheapest input and the first thing that limits production when short.
How to use Livestock Water Requirement Calculator
- 1Enter your animal/herd figures into the inputs.
- 2Read the headline result and the supporting breakdown.
- 3Apply the guidance in the note to your feeding decisions.
Why use Livestock Water Requirement Calculator?
- ✓Uses the standard, citable dairy-nutrition formula
- ✓Clear inputs with sensible defaults
- ✓Instant result with the working shown
- ✓Free, fully in-browser and private
Frequently asked questions
How much water does a dairy cow need per day?+
Roughly 5 litres per 100 kg of body weight for maintenance plus about 3 litres for every litre of milk, increasing by around 30% in hot weather. A 400 kg cow giving 12 litres needs roughly 56+ litres a day.
Does water affect milk yield?+
Strongly — milk is about 87% water, so any restriction quickly reduces yield. Provide clean, cool water free-choice at all times; it is the cheapest input with the biggest effect on production.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline at the farm and your data never leaves the device.
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