Lawn Fertilizer Calculator
Fertilizer bags list a rate for each 1,000 square feet of lawn. Enter your lawn size and that rate, and this shows how much product to spread and how many bags to buy.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Lawn area divided by 1,000 gives the number of thousand-square-foot blocks. Multiply that by the rate on the label to get the product weight.
The bag count divides that weight by the size of one bag and rounds up. Measure the lawn itself, not the footprint of the house.
Worked example
A lawn of 5,000 ft² at 3.5 pounds per 1,000 square feet needs 17.5 lb of product, which is 1 bags of the size you entered.
Questions
Where is the rate on the bag?
Look on the front or back for the coverage area and the spreader setting. Use the figure for the product you bought, since rates differ between products.
Is the spreader setting the same as the rate?
Not exactly. The setting is a starting point. Test on a small strip first so the rate is right before you cover the whole lawn.
Is more fertilizer better?
No. Too much can burn grass and wash into streams and ponds. Follow the label rate rather than adding more.
More like this
- Fertilizer Rate CalculatorPounds of product from a nutrient rate and field size.
- Lawn Watering CalculatorRun time per session from inches and output.
- Acre CalculatorAcres from the length and width of a plot.
- Farm Loan CalculatorPayment and total interest on a farm loan.
- Average Daily Gain CalculatorWeight gained per day between two weighings.
- Chicken Feed CalculatorFeed amount, cost and cost per dozen eggs.