Turn a fertilizer bag label into an exact amount to spread instead of guessing. Enter the three NPK numbers from the bag, which are the percent nitrogen, phosphate and potash by weight, then set your target rate of actual nitrogen in pounds per thousand square feet and the area you are feeding. The calculator divides your nitrogen goal by the nitrogen percent to find the pounds of product to apply, then shows how much phosphate and potash that same amount delivers. A common lawn and garden rate is about one pound of nitrogen per thousand square feet per feeding. Knowing the actual nutrient rate prevents burning plants and wasting product. Everything is calculated instantly in your browser with no signup.
Turn a fertilizer bag label into an exact amount to spread instead of guessing. Enter the three NPK numbers from the bag, which are the percent nitrogen, phosphate and potash by weight, then set your target rate of actual nitrogen in pounds per thousand square feet and the area you are feeding.
Yes. Fertilizer NPK Rate Calculator is completely free, with no sign-up and no usage limits.
Yes. Fertilizer NPK Rate Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Fertilizer NPK Rate Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.