Read a bag's N-P-K numbers into actual nutrient pounds.
Each of the three analysis numbers is read as a percentage of the bag's total weight. The NPK ratio tells you whether a product feeds growth, roots or fruiting, so matching it to the crop matters.
NPK Fertilizer
Each nutrient = bag weight x its percentage
Each nutrient = bag weight x its percentage Each of the three analysis numbers is read as a percentage of the bag's total weight.
The NPK ratio tells you whether a product feeds growth, roots or fruiting, so matching it to the crop matters.
This calculator takes 4 inputs: Bag weight, N - Nitrogen, P - Phosphorus, K - Potassium. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.