# Grass Seed Calculator, Formula, Calculation & Example

## Grass Seed Calculator

This grass seed calculator can help you plan your next lawn project. This calculator will allow you to calculate the amount of grass seed you need, and help you plan how to get it all done so your lawn looks great.

## How do I use the grass seed calculator

It is simple to use the grass seed calculator. These are the steps to calculate how much grass seed you will need for your lawn.

1. First, choose the shape of your lawn then enter its dimensions to allow the calculator to determine its area .

• Type width length to create a rectangular grass.
• Enter the radius to get a circular grass.
• You will need to measure the axis A, and (axes B) for an elliptical grass.
• To create a triangular grass, enter the base length and the height for the shape.

2. To calculate the amount of grass seed that you will need (in kilograms or pounds, since these are the units in which lawn grass seeds are sold), enter the seed coverage rate. The grass seed calculator will then return the required amount.

## Use the grass seed calculator as an example

Let’s look at an example of how to calculate lawn grass seed.

• Imagine a circle of lawn 50 feet in radius. The following formula will calculate the area of the circle:

`circle area = π * radius²`

`area = π * (50ft)² = 7,854ft²`

• You will need to know the coverage rate for the grass species you are considering. This information will help you calculate how many grass seeds you’ll need. Let’s assume that your lawn grass has an average CR of 5 pounds for every 1000 feet. Let’s now calculate how many seeds are needed.

`seeds = coverage rate * area / 1000`

`seeds = 5 * 7,854 / 1000 = 39.35 lbs`

• These simple calculations have shown us that to cover this area of grass you will need to purchase 39.35 pounds worth of grass seeds.
• The equations below are for the areas of the other shapes:

`rectangle area = width * length`

`ellipses area = axis A * axis B * π`

`triangle area = 1 /2 * height * base`

## What is the coverage rate

The grass’s coverage rates vary depending on which type of grass is used. This is the amount of seed required per square meter. This value is usually printed on grass seed packages. It is also different depending on whether the seeds are used to grow a new lawn, or if they’re being used for overseeding an established one.
Ask a professional at your store if you have any questions about the lawn grass coverage rate.

This table shows the coverage rates for some of the most popular grass types.

Grass type New lawn CR Overseeding CR
Buffalo 3 lbs / 1000 ft² 1.5 lbs / 1000 ft²
Creeping Red Fescue 5 lbs / 1000 ft² 2.5 lbs / 1000 ft²
Fine Fescue 5 lbs / 1000 ft² 2.5 lbs / 1000 ft²
Kentucky Blue Grass 4 lbs / 1000 ft² 2 lbs / 1000 ft²
Tall Fescue 10 lbs / 1000 ft² 5 lbs / 1000 ft²

Reference