Grass seed planning
Lawn Seed Calculator
Estimate how much grass seed you need from lawn area, seeding rate, extra allowance and bag size.
Lawn Seed Calculator
Estimate how much grass seed you need from lawn area, seeding rate, extra allowance and bag size.
Seed estimate
How the estimate works
Plan seed quantity before you buy
Measure the lawn area
Enter the total area you plan to seed in square metres.
Use the product seeding rate
Check the grass seed packaging and enter its recommended grams per square metre.
Add an allowance
A small percentage can cover spreading loss, edges and minor measurement differences.
Convert kilograms to bags
Enter the bag size to see how many whole bags you need to purchase.
Frequently asked questions
What seeding rate should I enter?
Use the rate printed on the grass seed product. Different mixtures and uses can require different rates.
Why add extra seed?
The allowance is optional planning margin for small losses and measurement differences. Adjust it to your project.
Why is the number of bags rounded up?
Seed is sold in whole bags, so the calculator rounds the purchase quantity up to the next complete bag.