If you have a column of numbers and you want to calculate a running total of the numbers alongside, you can use the SUM() formula combined with a clever use of absolute and relative references.

# Learn Excel Formulas and Functions

Excel offers over 300 functions and formulas to help you get more out of your spreadsheets. This page contains a summary of the functions that are covered by lessons on this site. It's being added to all the time, so check back often!

The SUMIFS function in Excel allows you to sum the values in a range of cells that meet multiple conditions, or criteria. For example, you might use the SUMIFS function in a sales spreadsheet to to add up the **value of sales** of a **specific product** by a **given sales person** (e.g. the value of all sales of a microwave oven made by John). This lesson explains how to use SUMIFS.

If you're using Excel to calculate dates, it is useful to know how to add (or subtract) a certain number of working or business days to a date. This lesson introduces the WORKDAY() function and shows you how to use it.

If you're using the Autofilter feature, you're probably wondering how to perform calculations on only those values that are being displayed by the filter. The SUBTOTAL() function is the answer.

The SUMIFS function in Excel allows you to sum the values in a range of cells that meet multiple conditions, or criteria. For example, you might use the SUMIFS function in a sales spreadsheet to to add up the **value of sales** of a **specific product** by a **given sales person** (e.g. the value of all sales of a microwave oven made by John). This lesson explains how to use SUMIFS.

The WORKDAY.INTL() function extends the WORKDAY() function so that you can specify which days are weekend days when adding days to dates. This lesson shows you how to use it.

This lesson shows you now to extract text from a cell in Excel. This is useful when you have a cell containing combining numbers and text, such as a part number, or several text values separated by commas. It introduces the RIGHT() and LEFT() functions, which are essential text manipulation functions in Excel.

COUNTBLANK allows you to count the number of empty or blank cells in a range in Excel. This lesson shows you how to use COUNTBLANK, and also shares a couple of things to watch out for when you use COUNTBLANK in an Excel formula.

This lesson shows you now to extract text from a cell in Excel. This is useful when you have a cell containing combining numbers and text, such as a part number, or several text values separated by commas. It introduces the RIGHT() and LEFT() functions, which are essential text manipulation functions in Excel.

The SUMPRODUCT function allows you to multiply two arrays of numbers together (e.g. Quantity Sold and Price Per Unit) and add the results each individual calculation together. Without the SUMPRODUCT function, you'll find yourself having to create a third column in which you multiply the Quantity by Price for each row, and then find the sum of all the individual formulas. This lesson shows you how to use SUMPRODUCT to do all that with just one formula.

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