Fertilizer Calculator — Calculate Fertilizer Amount by Lawn Size & NPK

Fertilizer Calculator — Calculate Fertilizer Amount by Lawn Size & NPK

Calculate the exact pounds of fertilizer needed for your lawn, garden, or field based on NPK ratio and recommended application rate.

🌿 Fertilizer Calculator

Fertilizer to Apply (lbs)
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50-lb Bags Needed
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Est. Cost ($25/50lb bag)
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💡 Pro Tip

Never apply more than 1 lb of nitrogen per 1,000 sq ft in a single application. Over-fertilizing (nitrogen burn) turns grass yellow or brown and can take weeks to recover.

Frequently Asked Questions

Q: How much fertilizer do I need per square foot?

Recommended nitrogen (N) rate for most lawns is 1 lb of actual nitrogen per 1,000 sq ft per application. Divide 100 by the N percentage on the bag to find pounds needed per 1,000 sq ft.

Q: What does the NPK ratio on fertilizer mean?

N=Nitrogen (green leafy growth), P=Phosphorus (root development), K=Potassium (disease resistance & drought tolerance). A 10-10-10 bag contains 10% of each nutrient by weight.

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