The NPK Fertilizer equation calculates the total weight of fertilizer and total bags needed for a given area of land. It also returns the weight of nitrogen, phosphorus, and potassium per bag.
INSTRUCTIONS: Enter the following
(N) Percent of Nitrogen per bag
(P) Percent of Phosphorus per bag
(K) Percent of Potassium per bag
(W) Weight of bag
(A) Area of land
NPK Fertilizer (NPK-F): The calculator returns the following:
Weight of nitrogen for total area of land
Number of bags for total area of land
Weight of nitrogen, phosphorus, and potassium per bag
The Math / Science
*This equation assumes the 1lb of nitrogen per 1,000 square feet standard