A formula in Excel always starts with an equals sign (=). It’s an instruction that tells Excel to perform a calculation or operation. For example, =SUM(A1:A10) adds all numbers from A1 to A10. Formulas can be as simple or complex as you need — and they update automatically when your data changes.
Essential Functions Every Business User Should Know:
• SUM: Add numbers together (=SUM(A1:A10))
• AVERAGE: Find the average of a range (=AVERAGE(B2:B50))
• COUNT: Count how many cells contain numbers (=COUNT(A1:A20))
• IF: Make decisions based on conditions (=IF(A1>100,’High’,’Low’))
• VLOOKUP: Find and retrieve data from another part of your spreadsheet
Let’s say you have monthly sales in cells A1 through A12. To calculate your total sales for the year, click on an empty cell and type =SUM(A1:A12). Press Enter, and Excel instantly adds them up. If any number changes, the total updates automatically — that’s the power of formulas.
Common Formula Mistakes to Avoid:
• Forgetting the equals sign — Excel won’t recognize it as a formula
• Using the wrong cell references — double-check your ranges
• Mixing units or data types (text vs. numbers) — can cause errors
• Circular references — when a formula refers back to itself
Formulas are where Excel stops being just a filing system and becomes a decision-making tool. Instead of manually calculating totals or averages, you let Excel do the work — faster, and with zero errors. Next, we’ll show you how to format your data so it tells a clearer story.
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