Calculate the perfect amount of fertilizer for your lawn. Get personalized NPK recommendations based on your grass type, lawn size, and seasonal needs.
Get personalized NPK recommendations for your lawn
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Expert Advice
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NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). The numbers represent the percentage of each nutrient by weight. For example, 10-10-10 means 10% nitrogen, 10% phosphorus, and 10% potassium.
Frequency depends on your grass type and season. Cool-season grasses typically need 3-4 applications per year (spring and fall), while warm-season grasses may need 4-5 applications during their growing season (spring through fall).
For cool-season grasses, apply in early spring and fall. For warm-season grasses, apply in late spring through early fall. Avoid fertilizing during extreme heat or drought conditions.
Organic fertilizers are derived from natural sources and release nutrients slowly over time. They improve soil health but may take longer to show results. Synthetic fertilizers provide quick results but don't improve soil structure.
Yes, over-fertilization can burn your lawn, cause excessive growth, and contribute to environmental pollution. Always follow recommended application rates and avoid applying fertilizer to wet grass or before heavy rain.
You can measure manually by multiplying length × width, use online mapping tools like Google Earth, or walk your lawn with a measuring wheel. For irregular shapes, break the lawn into smaller rectangles and add them together.
Fertilize after mowing when the grass is shorter. This ensures better contact between the fertilizer and soil, and the shorter grass won't interfere with even distribution.
Take our comprehensive grass identification quiz to get personalized care recommendations. You can also contact your local extension office or lawn care professional for help with identification.
Yes, seasonal fertilizers are formulated for specific needs. Spring fertilizers often have higher nitrogen for growth, fall fertilizers may have more potassium for winter hardiness, and starter fertilizers are high in phosphorus for root development.
Choose based on your lawn's needs: High nitrogen (first number) for green color and growth, high phosphorus (middle number) for root development and new lawns, high potassium (last number) for stress resistance and winter hardiness.
