Learn how to calculate Weighted Average in Excel with percentages using the SUM function and the SUMPRODUCT function.

One of the many features of Excel is being nosy. That's right, you can quickly calculate a persons age as long as you have their birth date.

Learn how to calculate the Simple Interest in Excel either for a single entry or a range or entries, between two dates, using this forumula.

If you need a monthly or yearly balance for revenue transactions in Microsoft Excel, you're in luck because both are easy! Here's how to find the totals you need.

Microsoft Word has a date field, but it's not easy to use in an expression. If you need to update dates in a document, use Excel to calculate the dates and then run a mail merge.

Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.

Net present value (NPV) is used to estimate the profitability of projects or investments. You can calculate NPV in two ways using Microsoft Excel.