Lawn Fertilizer Calculator

Calculate how many bags of lawn fertilizer you need and the correct spreader setting based on your lawn size, fertilizer NPK, and target nitrogen rate.

Lawn Area (square feet) Grass Type Fertilizer N-P-K (from bag, e.g. 28-0-6)

N %

P %

K %

Bag Weight (lbs)

lbs fertilizer needed

bags to buy

lbs per 1,000 sq ft

lbs N applied