Calculate percentages, percentage change (increase/decrease), discount percent, and ratios with step-by-step formula breakdowns. Free, instant, and private in-browser math calculator.
(15 ÷ 100) × 250 = 37.5
Stop calculating percentage markups item-by-item. Compute margins, taxes, and promotional discounts across 10,000+ SKUs.
Select from 3 quick tabs: What is X% of Y, X is what % of Y, or Percentage Increase/Decrease.
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Quick reference guide for common percentage equations used in financial budgeting, retail discounts, and business analytics:
| Calculation Type | Standard Formula | Practical Example | Result |
|---|---|---|---|
| What is X% of Y? (Discounts / Taxes) | P = (X / 100) × Y | What is 20% off a $150 jacket? | $30 discount (Final: $120) |
| X is what % of Y? (Portion / Share) | P = (X / Y) × 100 | 45 completed tasks out of 60 planned. | 75% completion rate |
| Percentage Increase (Growth) | % Increase = ((New - Old) / Old) × 100 | Revenue grew from $50,000 to $75,000. | +50% revenue growth |
| Percentage Decrease (Decline) | % Decrease = ((Old - New) / Old) × 100 | Ad bounce rate dropped from 40% to 28%. | -30% bounce reduction |
Covers percentage of a value, ratio calculations, and percentage change (increase/decrease).
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Clear answers about using this tool and automating workflows with RunMacro.
To calculate percentage change: subtract the original value from the new value, divide the difference by the absolute original value, and multiply the result by 100. A positive value indicates an increase, while a negative value represents a decrease.
The formula to calculate X% of Y is: (X / 100) * Y. For example, to find 15% of $200, divide 15 by 100 (0.15) and multiply by 200, resulting in 30.
Yes. RunMacro can automate large-scale batch percentage calculations, dynamic product discount updates across e-commerce platforms, and data synchronization between Excel, Google Sheets, and accounting software.
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