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Pick a crop and the calculator fills in nitrogen, phosphorus and potassium targets from the Fertilizer Recommendation Guide 2024 (FRG-2024), published by the Bangladesh Agricultural Research Council (BARC). It covers 136 crop tables for over 120 crops: boro, aus and aman rice, wheat, maize, potato, mustard, pulses, jute, vegetables, spices, flowers, fodder and fruit trees such as mango, banana, papaya, guava, pineapple, dragon fruit and malta.

The guide does not give one dose per crop. The dose depends on how rich your soil already is, so you choose the soil-test level (very low, low, medium or optimum) for nitrogen, phosphorus and potassium from your soil-test report. The calculator uses the middle of the guide's range and shows the range beside it.

The guide lists phosphorus and potassium as the elements, per hectare. The calculator converts them to P₂O₅ and K₂O, the form printed on fertilizer bags, and still works out your field in acres or hectares (and in bigha, katha and shatak when you use the Bangla version).

By default the nitrogen already contained in DAP is not subtracted, as in the guide. You can switch this on to see how much less urea you would need.

Fruit trees are different: the guide gives grams per tree for each age of the tree, so you enter how many trees you have and how old they are. Banana and papaya are dosed per plant for the pit and each top dressing.