Excel 2016  / 2003 / 2007 / 2010 / 2013

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  How to create an automatically extended or dynamic drop-down list

  When you work with data in Excel, often you need to add more and more of new data. However, it takes some time to update formulas, charts, tables, when you add new data. Excel proposes functions that can help to customize your data and avoid routine updating. This tip is about creating an automatically extended (also known as dynamically updated or just dynamic) drop-down lists.
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  How to create a computable drop-down list

  When you fill data in some spreadsheet, it can be necessary to show different drop-down lists that depend on some filled or calculated values.
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  How to create a dependent drop-down list

  When you fill data in some spreadsheet, it can be necessary to create dependent drop-down lists. The organization of these drop-down lists can be different – they can be filled step-by-step from left to right in the same row (like in the example below), cascading or even computed (see How to create a computable drop-down list).
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  How to calculate an age in Excel

  To calculate the age of a person, a pet, a project or even some device, you need to compute a number of complete years. The issue is that it doesn’t enough to calculate a year’s difference. Excel proposes very useful formula that can help you to calculate that very fast.
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  How to calculate a lifetime in Excel

  Sometimes it is necessary to calculate a lifetime for some devices, things. Usually, a lifetime calculates in complete months, for example to check a warranty or guaranty period. Excel proposes very useful formula that can help calculate that time.
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  How to calculate how many days left to or passed from the specific date in Excel

  For some projects or tasks, you might need to calculate how many days, months or years left to some date or how many days, months or years passed from some date till today. Excel proposes very useful formula that can help you to calculate that very fast.
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  How many work weeks left to or passed from the specific date in Excel

  When you plan a project, you can need to calculate a number of work days or full work weeks between start and end dates, or how many work days or work weeks left/passed. This tip is about easy and fast way of calculation of complete work weeks for weeks from Monday to Sunday.
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  How many weeks left to or passed from the specific date in Excel

  When you plan a trip, project, etc. you can need to calculate a number of days or weeks between start and end dates, or how many days or weeks left/passed. This tip is about easy and fast way of complete weeks calculation.
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  How to copy computed subtotals in Excel

  When you compute subtotals in your spreadsheet, it can be necessary to select only subtotals and copy them to another sheet for future processing. If you select subtotals and copy them using copy-paste (Ctrl+C and Ctrl+V), Excel paste all source data with subtotals. This tip demonstrates the workaround that allows you copy just rows with subtotals.
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  How to create an equilateral triangle, a regular square, and other regular polygons in Excel

  For some charts or diagrams, you need to create a regular polygon – equiangular (all angles are equal) or equilateral (all sides have the same length). E.g., equilateral triangle, regular square, etc.