Livestock Feed Ration Calculator
A livestock feed ration calculator estimates how much feed an animal needs each day, based on its body weight and a feeding rate expressed as a percentage of that weight. Many feeding guides set a daily ration as a percentage of body weight on a dry-matter basis: a horse at maintenance might eat about 2 percent of its weight, a growing or working animal more. This tool takes the animal's body weight and the feeding percentage, then multiplies them to return the daily feed amount in the same weight unit. Both inputs are editable so you can model cattle, horses, sheep, goats or other stock at maintenance, growth, lactation or work, and scale the percentage to your forage quality and conditions. Knowing the daily ration helps you plan feed purchases, budget cost, and check that animals are neither under nor over fed. Feed planning has a cost-budgeting side too, and Investor.gov provides general guidance on budgeting and money management. Always confirm a balanced ration with a nutritionist or extension specialist for production animals. Every figure is computed deterministically from the weight times percentage formula shown below, with a worked example that reconciles exactly to the calculator so you can follow each step yourself.
Daily feed multiplies body weight by the feeding percentage: feed = body weight x percent. A 1,200 lb animal fed at 2.5% of body weight needs 30.00 lb of feed per day.
Feed ration formula
Daily feed = W x (P / 100)
W = animal body weight
P = feeding rate (percent of body weight)
The percentage is usually given on a dry-matter basis. If you feed wet or high-moisture feed, adjust the amount upward so the animal gets the intended dry matter.
Worked example
A 1,200 pound animal is fed a daily ration of 2.5 percent of its body weight.
- Body weight = 1,200 lb
- Feeding rate = 2.5 percent
- Daily feed = 1,200 x 0.025 = 30.00 lb
The animal needs 30.00 pounds of feed per day. These are the calculator's default inputs, so the result above matches the widget exactly.
Livestock Feed Ration Calculator: frequently asked questions
What percentage of body weight should animals eat?
It depends on the species and stage. A common range is 1.5 to 3 percent of body weight in dry matter per day. Maintenance animals are near the low end; growing, working or lactating animals are higher. Use a figure from a species-specific feeding guide for your situation.
Is the percentage on a wet or dry basis?
Feeding rates are usually stated on a dry-matter basis, which removes the water in the feed. If your feed is wet (fresh forage or silage), you must feed more total weight to deliver the same dry matter. Adjust the amount upward using the feed's dry-matter content.
Does this balance the ration?
No. This calculator finds the daily quantity of feed, not its nutritional balance. A balanced ration also meets the animal's needs for energy, protein, minerals and vitamins. Work with a nutritionist or extension specialist to formulate a complete ration for production animals.
Can I use kilograms?
Yes. The formula works in any weight unit. Enter body weight in kilograms and the daily feed comes out in kilograms. The percentage stays the same because it is a ratio of weights.
How do I budget feed cost?
Multiply the daily feed by the number of animals and days, then by the price per unit of feed. Planning feed cost is part of running a farm budget. Investor.gov offers general guidance on budgeting and managing money that applies to any household or small-business plan.
Official sources
- General budgeting and money management guidance: US Securities and Exchange Commission, Investor.gov. As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.