Limited quick reference for engineering formulas and application information. eFunda stands for engineering Fundamentals and provides basic college level material covered in engineering schools. Its mission is to create an online destination for the engineering community to quickly find concise and reliable information to meet the majority of daily engineering reference needs. Unfortunately, you can only do ~10 searches or clicks on links before it requires you to buy a paid membership to unlimited access, but you can find similar information on the Engineers Handbook site without limitation. This limitation is reset when you access the site again with a new browser or a new device. So, use this resource carefully, knowing your free limited access!