Going from a text address (eg: "900 Harvey St. Oakland") to latitude and longitude coordinates is called "geocoding".
Batch Geocoding Wizard is a very simple geocoding tool to use. What you need to do is just paste your text addresses list, then just click one button, you will get all the latitude and longitude of your addresses. At the same time, all of your addresses will be added into Google Map, so you can check those coordinates easily.
Anyway, please enjoy the simple resolve text address to latitude and longitude tool:)