Category: Finance
· URL: /tools/percentage-tool-calculator.html
Privacy: runs locally in your browser. No uploads, no tracking scripts.
How to use
Select a mode, enter the values, then tap Calculate. Use Copy to copy the main result.
- Choose what you want to compute (percent of / what percent / % change / add % / subtract %).
- Enter the required numbers (decimals allowed).
- Click Calculate to see the result and the formula used.
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Secondary intents covered: Calculate p% of a value for discounts, tax, tips, and commissions, Find what percentage one number is of another, Compute percent change between an old and new value, Increase a number by a percentage (markup, raise, inflation), Decrease a number by a percentage (sale price, reduction), Copy a clean result for reports, invoices, or spreadsheets, Quickly validate calculations without a spreadsheet
FAQ
How do I calculate p% of a number?
Use “Percent of a number”: enter p and x, and the tool computes x × (p/100).
How do I find what percent A is of B?
Use “What percent is A of B?” The formula is (A ÷ B) × 100; B must not be 0.
What’s the formula for percent change?
Percent change is ((new − old) ÷ old) × 100. Old cannot be 0.
Is percent change the same as percentage points?
No. Percent change is relative to the old value; percentage points are an absolute difference between two percentages.
Can I use decimals and negative numbers?
Yes. Decimals and negatives work in all modes; the output keeps a compact precision.
Why do I get an error when the denominator is 0?
“What percent” uses B as the denominator and percent change uses old as the denominator; division by zero is undefined.
How do I copy the result?
Click “Copy result” to copy the main result line (for example “75%” or “132”).