10Oct 2026
Guides
What Is Aspect Ratio? Image, Video and Screen Sizes Explained
Aspect ratio is the shape of an image, video or screen. Learn how to calculate it, how it differs from resolution, and which ratios suit website…
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Guides
10Oct 2026
Guides
How to Calculate a Discount: Percent Off, Sale Price and Stacked Discounts
Learn the discount formula, quick mental shortcuts for percent off, how to find the original price, why stacked discounts never add up, and the Excel formulas.
10Oct 2026
Guides
How to Calculate Days Between Dates: By Hand, in Excel and in Google Sheets
Count the days between two dates by hand, then use the right Excel and Google Sheets formulas for working days, end dates, days from today and…
10Oct 2026
Guides
How to Calculate Your Final Grade (and What You Need on the Final)
Learn the final grade formula, work out the score you need on your final to pass or get an A, and set it up in Excel…
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