There are several ways to see how your offer compares to similar positions. You can look up the company on Glassdoor and see if there are recent reviews that include salary information for your position. You can also look at sites like PayScale and Salary.com which offer information about positions in many industries. Be sure that when you are searching you include the location where your offer is. The same job title will likely pay much higher in New York City than it would in a rural area of the midwest.