What Next?

What happens if you run Know Your Worth only for it to say that you are being underpaid by $10,000? First, know that the tool is just an estimate, and that it might not accurately reflect your exact situation. Secondly, don't just get angry or depressed by the numbers that Glassdoor's tool spits back at you. Resolve to do something about it.

Your first step might be to ask your current employer for a raise. To increase your odds of success, though, do this right. Don't just march into your boss' office. Instead, set up an appointment with the people who actually have the power to boost your salary. And prepare for this meeting.

You can reference the Glassdoor numbers, and you should bring a copy of them to your meeting. But don't rely on those figures entirely. You also need to create a compelling argument for why you deserve a raise.

Have any of your initiatives or projects that you spearheaded resulted in a boost in your company's bottom line? That's important information to bring up. Are you doing the work of several people because your company has yet to fill open positions it created way back during the country's economic downturn? Mention that, too.

The key to negotiating a higher salary is to provide concrete examples of your worth to the company. If you've led successful rollouts of new products or services, this is important to highlight. If you've built the top-producing sales team in your company, share that knowledge.