RolloverSystems Inc. has developed a Web tool that encourages workers to keep money in 401(k) plan accounts.

uses the current age of a visitor, the expected retirement age, the visitor’s plan balance, and the visitor’s expected rate of return to show visitors how much money they will lose if they withdraw all cash from their retirement plans.

RolloverSystems, Charlotte, N.C., says Web-based services that help retirement plan participants roll assets over into different retirement accounts.