Work out npk ratio instantly with clear inputs, formula shown and shareable results.
Converts the label percentages into kilograms of each nutrient applied and reduces the analysis to its simplest ratio.
NPK arithmetic
Nutrient applied = label percentage / 100 x fertiliser mass; a 10-26-26 product supplies 10 kg N per 100 kg
Percentage nitrogen, phosphate as P2O5 and potash as K2O by mass, in that fixed order.
Historical convention; P2O5 is 43.6% phosphorus, so 26% P2O5 is about 11.3% actual P.