Cattle per Acre Calculator (2024)

Created by Wojciech Sas, PhD

Reviewed by

Steven Wooding

Based on research by

Montana Grazing Animal Unit Month (AUM) Estimator; United States Department of Agriculture NATURAL RESOURCES CONSERVATION SERVICE; September 2008See 1 more source

Aasen A, Bjorge M Alberta Forage Manual, 2nd Edition; Alberta Agriculture and Rural Development; 2009

Last updated:

Jan 18, 2024

Table of contents:
  • The animal unit — how many acres does a cow need?
  • How much land does a cow need?
  • How to use cattle per acre calculator?
  • How many acres do you need per cow? A sample computation
  • Tame pasture condition classes explanations
  • FAQ

If you want to know how many cows per acre can graze, this cattle per acre calculator will help you find the answer! Keep on reading to learn about Animal Unit and Animal Unit Month measures and see how the different pasture conditions influence how many cattle per acre may fit.

Do you want to ask the question another way around — How much space does a cow need? If so, you are at the right place to get the answer!

The animal unit — how many acres does a cow need?

The Animal Unit (AU) is a universal measure that helps you estimate how many cattle per acre you can graze. One AU is a 1000 lb cow with a calf of up to six months old.

Typically, a cow eats forage at a rate of around 75-80% of its mass per month. Although a calf doesn't need grass for grazing, it still consumes cow's milk, resulting in higher forage consumption by the mother.

Another standard measure is Animal Unit Month (AUM), which is the monthly forage demand for 1 AU. According to Natural Resources Conservation Service, NRCS. 1 AUM equals 915 lb.

We need to estimate the pasture forage yield to know how many acres a cow needs. The numbers may lie in a vast range from 0.25 up to 7.5 AUM/ac. Many factors influence these values:

  • Pasture condition;
  • Precipitation zone;
  • Forage type; and
  • Grazing strategy (e.g., rotational grazing).

In our cattle per acre calculator, we focus mainly on the first two factors. Check the table (from Alberta Forage Manual) to see the estimated values of forage production:

Annual precipitation zones

Pasture condition class (yield in AUM/ac)

Excellent

Good

Fair

Poor

250-350 mm

0.75

0.50

0.40

0.25

350-450 mm

1.25

0.80

0.60

0.40

450-550 mm

2.00

1.40

1.10

0.70

550-650 mm

3.30

2.20

1.60

1.10

Irrigation

7.50

5.00

3.75

2.50

How much land does a cow need?

A typical 1000 lb cow with a calf (1 Animal Unit) needs around 0.27 ac (0.11 ha) of pasture in excellent condition and applied irrigation, up to 8 ac (3.2 ha) of pasture in poor condition and low precipitation level. Similarly, a 1300 lb cow with a calf (1.3 AU) requires between 0.34 and 10.3 ac or 0.14 and 4.2 ha land.

🙋 Are you wondering how much it will cost to fence off this land for your cattle? That's where the livestock fence cost calculator can really help you budget for your cattle fence.

How to use cattle per acre calculator?

Let's go together through the step list to understand how our cattle per acre calculator works:

  1. Choose a cattle type you want to graze. If you know the average animal unit of the herd, you can select the Custom option and input your own value.

  2. Enter the total area of the pasture. Check our acreage calculator if you know only the field's dimensions.

  3. If you don't know the forage yield, choose the annual precipitation and pasture condition. If you do know the number, you can enter the value yourself.

  4. That's all! You can see pasture's cumulative forage production, the total number of cattle, and how many cows per acre can graze on the field in the result section.

  5. You can also play with other parameters (e.g., the utilization rate) according to your needs. Choose the Advanced mode if you know the forage yield and like to modify the lb-to-AUM conversion ratio — by default, it's 915 lb/AUM.

💡 Remaining on cattle-related topics, you may also be interested in checking the cow gestation or animal mortality rate calculator to run your business as efficiently as possible.

How many acres do you need per cow? A sample computation

Now that you know how much land a cow needs and how to use this cattle per acre calculator, let's proceed to an example.

Suppose we want to know the total number of cows that can fit an 800 ac pasture in good condition. We want to keep a herd with an average weight of 1300 lb for the cows with calves. The field's location is relatively wet, which assures the average annual precipitation of 550 to 650 mm. The utilization rate is 50%.

  1. Good pasture condition and precipitation zone provide the average forage yield of 2.2 AUM/ac or 2000 lb/ac.

  2. The total monthly production of the field is 2000 lb/ac × 50% = 1000 lb/ac.

  3. Out of 800 ac pasture, you can collect: 1000 lb/ac × 800 ac = 800,000 lb of forage. We can also write it as: 800,000 lb / 915 lb/AUM = 874 AUM.

  4. An animal equivalent of our cows is 1.3, so the total number of cattle is 874 / 1.3 = 673.

  5. Additionally, we can estimate how many cattle per acre it is (we assume a pair of cow and calf as a single unit): 673 / 800 = 0.84 cattle/ac.

  6. We can also ask the question the other way around — how many acres do you need per cow? Simply find the multiplicative inverse of the previous number: 1 / 0.84 = 1.19 ac per cow.

Tame pasture condition classes explanations

If you want to learn more about different pasture condition classes, check the definitions by Alberta Forage Manual:

Category

Excellent

Good

Fair

Poor

Potential yield of the area

75-100%

60-75%

50-60%

33-50%

Production from desirable, adapted grass and legumes

95%

90%

60%

Less than 50%

Production from weeds or undesirable plants

Less than 5%

Less than 10%

20% or more

50% or more

Fertility program

Average to above average

Average

Below average or non-existent

No fertility program

Keep in mind that the values in the table and the results from our cattle per acre calculator are only rough estimations, as the actual yield of a pasture varies for different legumes and grass types. Also, forage production changes throughout the year.

FAQ

How many cows can graze on 5 acres?

You should be able to graze from 2 to 4 cows on average pasture per every 5 acres. However, this number may rise to 20 assuming excellent pasture conditions and applied irrigation.

How many heads of cattle per acre can I keep?

On average, you can have around 0.4 to 0.8 head of cattle per acre if you want to ensure the grazing at the proper rate. Keep in mind that one head of cattle (or one Animal Unit) often refers to the cow and calf pair.

How many cows per acre can I have with rotational grazing?

You should be able to keep between 0.5 and 1.1 cows per acre on average pasture. In general, rotational grazing may increase the cows-per-acre rate up to 30% compared to traditional grazing. However, rotational grazing techniques require at least two paddocks and are usually more expensive.

Wojciech Sas, PhD

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FAQs

How many cows can you put on 1 acre? ›

How many cows per acre can I have with rotational grazing? You should be able to keep between 0.5 and 1.1 cows per acre on average pasture. In general, rotational grazing may increase the cows-per-acre rate up to 30% compared to traditional grazing.

Is 3 acres enough for 2 cows? ›

You may have heard a rule-of-thumb is that it takes 1.5 to 2 acres to feed a cow calf pair for 12 months. That means we should be able to have 10 to 13 cows. Let's see how this rule-of-thumb holds up. It looks like our rule-of-thumb held up pretty good, 11 cows on 20 acres, is 1.8 acres per cow.

How many acres do you need for 50 cows? ›

For instance, a 1200-pound cow will be 1.2 AUs. Then, use your herd's carrying capacity and total AUs to calculate your needed land. For instance, if your land's carrying capacity is 0.5 AU per acre and you have a herd of 50 cows, each being 1.2 AUs, you'll need [(50 cows * 1.2 AUs/cow) / 0.5 AUs per acre] = 120 acres.

Is 10 acres enough for cattle? ›

A typical 1 AU, 1,000 lb, cow might require as much as 8 acres (3.2 ha) on poor quality pasture with low precipitation or as little as about 0.27 acres (0.11 ha) on an irrigated pasture in excellent condition.

How much profit from 10 cows? ›

The self-evident answer to these questions is “no.” It does not matter if you are milking 200 cows or 2,000 cows, 10 cows is a big deal when looking at the bottom line to your income over feed cost. In this scenario, 10 fewer cows results in $99 per day, $693 per week, $3000 per month in potential lost revenue.

What is the most profitable livestock to raise? ›

What Are the Most Profitable Livestock for Small Farms?
  • Chickens. Raising chickens is a great way to start any small farm or homestead. ...
  • Goats. ...
  • Bees. ...
  • Rabbits. ...
  • Cattle. ...
  • Pigs. ...
  • Why raising livestock is good for small farms.
Mar 1, 2024

How long does it take to raise a cow for slaughter? ›

Choice. Slaughter steers, heifers, and cows 30 to 42 months of age possessing the minimum qualifications for Choice have a fat covering over the crops, back, loin, rump, and ribs that tends to be moderately thick. The brisket, flanks, and cod or udder show a marked fullness and the muscling is firm.

How much does it cost to raise a cow? ›

Feeding Costs

The average cow can consume up to 3% of its body weight daily in feed, equating to roughly 30 pounds for a 1,000-pound cow. The type and cost of feed can vary, but it may include hay, pasture, grain, or commercial feeds, which can cost between $30 and $100 per month per cow.

How many goats for 1 acre? ›

To produce 70% of your herd's forage, you will need an acre for 1-3 goats (3-9 goats/hectare). The exact stocking density is variable and depends on the forage yield, soil, climate, season, and length of forage growth.

How much do beef farmers make per cow? ›

USDA's Economic Research Service provides annual cow-calf costs and returns estimates for the United States and key production regions. Annual U.S. returns over variable costs in the current cattle cycle have averaged $124 per cow, with a high of $391 per cow in 2014 and a low of $12 per cow in 2022.

How many cows can you raise on 40 acres? ›

Let's see what grandpa's farm would have looked like from the grazing side. In 1950, the typical grazing operation was approximately 40 acres with an average of 13 cows. This works out to three acres of pasture per cow.

How many bison per acre? ›

Don't think you can simply make a go of bison farming on a small-scale hobby farm with a half-acre lot. While the exact acreage needed will depend on the quality of your land, you may need to figure on several acres per head, so a herd of twenty bison could easily demand sixty acres of grazing land or more.

How many cows can you put on 1 acre of land? ›

' And the average in their county is 80 cow days per acre, which means you can run one cow on one acre for 80 days, or you can run 80 cows on 1 acre for 1 day.” “At Joel's farm he puts the equivalent of 400 cows on 1 acre of grass.

Can I raise a cow in my backyard? ›

Raising a couple cattle can feed your family and then some for the year. You don't even need a lot of land to do it—as a rule of thumb, you can keep one cow-calf pair per every 2 acres of pasture for 12 months.

How many bulls per cow? ›

that a mature bull can service 25 to 35 cows; however it has been shown that highly fertile bulls can service up to 50 cows. *Some heifers may have been included in this category. An annual reproductive examination is important to ensure that bulls are healthy and fertile.

Can you raise cattle on 1 acre? ›

After doing some research, the general rule of thumb is 1.5 acres per cow. You can do it on even less property, if you don't mind supplementing with hay all year. Yet, hay is expensive and not a good year-round option.

How many mini cows per acre? ›

Miniature cattle are great for small acreages. They can be anywhere to 1/2 or even 1/3 the size of standard cattle, so, therefore, require less feed and land. We encourage the ration of one miniature cow per ½ to 1-acre grass with good quality hay during the winter months.

References

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