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In Excel, calculating percentages means writing formulas like =(B2-A2)/A2 and remembering to format as percentage. Or you can just type your two numbers into our calculator and get the answer in one click — no formula, no formatting.
Excel is powerful. It is also overkill for answering "what is 15% of 230?" You do not need to open a spreadsheet, remember which cell reference goes where, and then format the result just to get a single number. For quick percentage questions, a dedicated calculator is faster every time. For large datasets with hundreds of rows, Excel wins. Here is exactly when to use each.
| Feature | WildandFree Calculator | Excel Formula | Google Sheets |
|---|---|---|---|
| Requires formula knowledge | ✓ No — just type numbers | ✗ Must write formulas | ✗ Must write formulas |
| Risk of wrong cell reference | ✓ None — no cells | ✗ Common error source | ✗ Common error source |
| Handles "X% of Y" | ✓ Built-in mode | ~=A1*B1/100 | ~=A1*B1/100 |
| Handles "X is what % of Y" | ✓ Built-in mode | ~=A1/B1 + format | ~=A1/B1 + format |
| Handles percentage change | ✓ Built-in mode | ~=(B1-A1)/A1 + format | ~=(B1-A1)/A1 + format |
| Formatting needed | ✓ Shows % automatically | ✗ Must format as % | ✗ Must format as % |
| Mobile-friendly | ✓ Full mobile support | ~Awkward on phone | ~Better than Excel |
| Works offline | ✓ Runs in browser | ✓ Desktop app | ✗ Needs internet |
| Free | ✓ Completely free | ✗ $6.99-12.99/mo (365) | ✓ Free |
| Shows formula used | ✓ Displays the math | ~Only if you read the formula bar | ~Only if you read the formula bar |
| Instant — no setup | ✓ Open and type | ✗ Open app, create file, find cell | ~Open, but still need formula |
If you do use Excel, here are the formulas you need with the common mistakes that trip people up:
| Task | Excel Formula | Common Gotcha |
|---|---|---|
| X% of a number | =A1*B1/100 or =A1*0.15 | If B1 contains 15 (not 0.15), use /100. If B1 is already formatted as %, just use =A1*B1 |
| What % is X of Y | =A1/B1 then format as % | Forgetting to format the cell as percentage — you see 0.84 instead of 84% |
| Percentage change | =(B1-A1)/A1 then format as % | Putting New in A1 and Old in B1 flips the sign. Old value is ALWAYS the denominator |
| Add % to a number | =A1*(1+B1) if B1 is decimal | If B1 contains 10 (not 0.10), use =A1*(1+B1/100) instead |
| Subtract % from a number | =A1*(1-B1) if B1 is decimal | Same issue — check whether B1 is 0.20 or 20 before writing the formula |
| Percentage of total | =A1/SUM(A:A) | Using the wrong range in SUM — include only data rows, not headers or totals |
| Running percentage | =SUM($A$2:A2)/SUM($A$2:$A$100) | Mixing up absolute ($) and relative references breaks the running total |
These mistakes account for the vast majority of wrong percentage results in spreadsheets:
Excel wins when:
Our Excel Viewer lets you open and inspect .xlsx files directly in your browser if you need to check spreadsheet data without installing Excel.
Our Percentage Calculator wins when:
Google Sheets uses identical syntax to Excel for percentage calculations. Every formula in the cheat sheet above works the same way. The only differences:
For quick answers, our calculator is still faster than opening a Google Sheet. For ongoing data work, Sheets is a solid free alternative to Excel.
Skip the Excel formulas — type two numbers and get the percentage answer instantly.
Open Percentage Calculator