Use the plant population calculator to calculate the number of plants you can grow in your farm field and make early yield and profit estimates. You can switch between plants per hectare or plants per acre depending on your evaluation and use the result of the plant population calculator to compare early-season and late-season crop population or evaluate crop losses and replanting strategy.

If you're gardening or landscaping, use the plant spacing calculator to find the most appropriate plant spacing for your crops. This article addresses how to calculate plant population, using the plant population density calculation formula and using this tool as a plant per hectare calculator or plant per acre calculator. Depending on the kind of crop you want to grow, you can also measure the plant yield that you'd get!

Why is the plant population calculator necessary? — Plant population density

Plant population is the number of plants in an area of land. Farmers need to find the optimum plant population for their farmland if they want to get healthy plants and maximum yield. It's essential if you're transplanting and have to plan field structure accounting for walkways or seed planting (which is usually the case with large farm fields), and you must factor in the growing cost of seeds to avoid wastage.

Another vital importance of growing an optimum plant population is to avoid overpopulated fields or high plant density that can lead to plants competing for food, water, and space. On the other hand, low plant density leaves room for weeds to invade your farm.

Therefore, farmers must use the formula for calculating plant population to check these possibilities. The plant population calculator makes it easy to find crop plant population so you can:

  • Determine optimum plant population for your farm.
  • Find proper plant spacing.
  • Know how much fertilizer, manure, and mulch the farm needs. (Our fertilizer calculator and mulch calculator can help you with that!)
  • Estimate the amount of labor to cultivate the farm.
  • Arrange for water needed and the appropriate irrigation method.
  • Establish your margin of safety when accounting profit from crop yield.

How to calculate plant population or the number of plants per acre?

To calculate plant population, multiply the number of plant rows by the number of plants per row. However, if you want to find the plant population per area of land, as is the case when planning field cultivation, use the formula:

Plant population = (field area x number of plant/stand) / ((plant spacing + walkway width) x row spacing)

Note that you must use the same units in the plant population density calculation formula.

How to calculate plant population per acre?

If you want the plant population or number of plants per acre, simply divide the calculated plant population by the field area in acres.

Plant population per acre = plant population / field area in acres

But since you're here, you don't need to calculate plant population per acre or worry about how to calculate plant population when using the plant population calculator. Just input figures into the calculator to get your result.

How to use the plant population calculator?

Using the plant population calculator as a plant per acre calculator or plant per hectare calculator is very simple. And you don't even have to follow the steps in the exact order given to get your answers:

  1. Determine the area of your farm field:
    • If you have a shapeless or non-regular farm field, input the length of the longest side and measure the breath of 5 different sections to get the average width.
    • If your farm field is square-shaped, input the length and width of the field.
  2. Provide the plant spacing or spacing between plants.
  3. Figure out how wide you want your walkway to be.
  4. Input the row spacing.
  5. Input the number of plants or seeds per stand to get the total plant population.
  6. In the calculator advanced mode, you can estimate the weight of seeds to buy by inputting the number of seeds per unit weighed.

How to buy plant seeds?

Plant seeds are sold in sealed tins or packets by weight. Occasionally, you are provided with the number of seeds available in these sealed containers; most of the time, you only get the weight. If you want to buy seeds, it is good to know the right amount to buy based on your evaluated plant population to avoid buying more than required. But how do you do that?

You also need to account for germination failure. Plant mortality happens the same way animal mortality is a reality for pastoral farmers. Therefore, it is good to plant an additional 10–20% of the calculated population, so you can get your desired harvest in case of crop losses. In the calculator's advanced mode, you can do this by providing possible losses to get a new target plant population.

Next, get an estimate of the number of seeds per kilogram or pound. Then, use the formula to get the number of seeds needed:

Estimated weight of seeds needed (for the plant population) = (number of seeds per kg/lb * field area) + 20%

Provide the information in the plant population calculator to find the exact weight of seeds you need for the calculated plant population.

Some estimates for the number of seeds per kilogram are as follows:

Crop

Seeds per kilogram (kg)

Groundnut

1,500

Maize

2,500

Beans

3,000

Cowpea

4,000

Sorghum

40,000

Rhubarb

60,000

Corn Salad

800,000

Rosemary

900,000

Lettuce

1,200,000

Pumpkin

10,000

Kale

68,000

Tomato Cherry

86,000

Radish

140,000

Parsnip

146,000

Squash

15,000

Mustard

125000

Turnip

100,000

Watermelon

20,000

Cauliflower

200,000

Chilli

200,000

Pea

900

Spinach

30,000

Tomato

250,000-380,000

Eggplant

250,000

Cabbage

350,000

Broccoli

350,000

Brussels Sprouts

350,000

Sunflower

1,500

Cucumber

40,000

Carrot

400,000-1,200,000

Onion

400,000

Beetroot

48,000

Thyme

250,000

Parsley

600,000

Corn

8,000

Okra

3,500

FAQ

How to calculate plant population per acre?

To calculate plant population per acre:

  1. Determine the area of the field in acres.
  2. Multiply the area of the field by the number of plants grown per stand.
  3. Divide the result by the product of space between plants in acres and space between rows in acres.

What is the formula for calculating plant population?

The formula for calculating plant population is:

Plant population = (field area x number of plant per stand) / ((plant spacing + walkway width) x row spacing)

How to establish plant population?

  1. Use the plant population calculator to find the optimum plant population for your farmland.
  2. Account for seed germination failure by increasing the plant population by 10-20%.
  3. Buy the right number of seeds needed.
  4. Divide the farmland into rows, accounting for walkways. If the rows are large enough, 50 cm or above, you may not need walkways.
  5. Plant your seeds by recommendation.

What is the best soybean population for 15-inch row?

You can determine the best soybean population for a 15-inch spacing between rows by dividing your farm area by the product of your spacing between each soybean plant or seed and 15-inches.

Oghenekaro Elem
Farm field dimensions
Field length
m
Field width
m
Field area
ha
Planting details
Plant spacing
cm
Row spacing
cm
Walkway width
cm
Number of plants per stand
Result
Plant population
Plant population per area
/
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