The OSM Transfer Ratio Calculator is a free Chrome add-on designed to assist users in managing player transfers within the Online Soccer Manager (OSM). This tool provides essential calculations for evaluating the price-to-value ratio when buying and selling players, helping users make informed decisions based on current market trends. It highlights players that cannot be purchased in red, allowing users to focus on viable options.

When selecting a player, the calculator displays a color-coded ratio that indicates whether the price is favorable. A good buying ratio is typically 1.5 times the player's price, although users may opt to pay more for strategic reasons. Additionally, it shows the maximum selling price and potential profit, guiding users on how to price their players effectively, especially when dealing with higher-value players.