Knowing what you make in comparison to your colleagues in similar positions gives you a better idea of whether you fall on the low or high end of the compensation scale. Inquire with the human resources department in your company for pay scale charts for jobs similar to yours, Quintessential Careers suggests. Use the Internet to research typical salaries of workers holding similar positions in other companies.
Use the information you collect to form a basis for a target figure to request for a salary increase. However, let your supervisor initiate any discussion about actual facts and figures. You may be pleasantly surprised. In any event, you'll have a ballpark idea of what the company is willing to offer, if anything.