Fertilizer Calculator
Calculate fertilizer amounts for your garden or lawn based on area and NPK requirements
Garden/Lawn Area
sq ft
Measure your garden length x width
Fertilizer Type
NPK: 10-10-10 | Est. $0.75/lb
Fertilizer NPK Ratio(from preset)
Leaf growth
Root & bloom
Overall health
$
Desired Application Rate
Target nutrient amounts per 1,000 sq ft. Common rates: Nitrogen 0.5-1.5 lbs, P and K 0.25-0.5 lbs.
Soil Test Results (Optional)
Enter your soil test results to track current nutrient levels. Values are typically in ppm (parts per million).
Application Timing Guide
Early Spring
Apply slow-release nitrogen for green-up. Best time for lawn fertilizer.
Late Spring
Apply balanced fertilizer for vegetables and flowers.
Summer
Light feeding only. Avoid fertilizing during heat stress.
Fall
Apply phosphorus and potassium to strengthen roots for winter.
Results
Coverage Area
1000 sq ft
Fertilizer Needed
0
Balanced (10-10-10)
Actual N-P-K Applied (per 1000 sqft)
0.00
N (lbs)
0.00
P (lbs)
0.00
K (lbs)
Estimated Cost
$0.00
at $0.75/lb
Synthetic Fertilizer
Fast-acting, precise nutrient delivery
Pro Tips
- Never apply more than 1 lb N per 1000 sqft at once
- Water thoroughly after applying fertilizer
- Get a soil test before fertilizing
- Split applications are better than one large dose