NPK Fertilizer Calculator
Calculate the optimal fertilizer amounts based on your garden needs
Area Based
Plant Based
Soil Test
Tomatoes
N-heavy (5-2-5)
Roses
P-heavy (4-8-4)
Lawn
N-heavy (20-5-10)
Blueberries
K-heavy (4-3-6)
Recommended Fertilizer Amount
4.6
pounds
Apply at a rate of 4.6 lbs per 1,000 sq ft
0.46
lbs Nitrogen
0.46
lbs Phosphorus
0.46
lbs Potassium
NPK Composition
Nitrogen (N)
Phosphorus (P)
Potassium (K)
Application Guide
When to Apply: Early spring and mid-fall
How to Apply: Spread evenly over the soil and water thoroughly
Application Frequency: Every 4-6 weeks during growing season
Special Notes: Water after application to prevent burning
This calculator provides estimates based on general recommendations. For precise fertilizer needs, consider a professional soil test.