The objective of this work was to evaluate the economic viability of the brown sugar production in micron-agroindustries, for small producers of sugar cane of the North region of the Rio de Janeiro state. To evaluate the viability of this activity, they were estimated the Net Present Value (NPV) and the Internal Rate o Return (IRR) and, to evaluate its degree of risk, a Monte Carlo simulation was carried out. The results shown that the brown sugar production in small agroindustries is a viable economic alternative for the region. The price of the brown sugar was the variable with the biggest effect on the economic results of the activity, followed by the cost of the labour. The economic risk of this activity was relatively low. From these results, it can be concluded that the brown sugar production is a good economic alternative for the small sugar cane producers of the region.