Fertilizer Application Calculator
How much fertilizer to spread to hit a nitrogen target.
m²
g/m²
%
kg
How it works
Product weight = area × nitrogen target ÷ nitrogen percentage. A 10-10-10 fertilizer is 10% nitrogen, so each gram of nitrogen needs 10 g of product. Always follow the label limits for your crop or lawn, because over-fertilizing burns plants. Example: with the default values, 200 m² at 4 g/m² of nitrogen needs 8 kg of a 10% product.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.