Money & Finance · Free tool
Percentage Change Calculator
Calculate the percent change between two values. Shows direction (↑/↓) and absolute delta. Standard finance formula.
Percentage change
↑ 25.00%
Absolute change: +25 (from 100 to 125)
Formula: ((new − old) ÷ |old|) × 100. Using |old| means a swing from −10 to +10 reads as +200%, not −200% — which is the standard finance/statistics convention.
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What it does
Calculate the percentage change between two values, with a directional indicator (↑/↓), the absolute delta, and a clear label for how to read it. Uses |old| as the denominator, so a swing from −10 to +10 reads as +200% — the standard finance/statistics convention.
Useful for sales-vs-target, stock returns, year-over-year metrics, or any "what’s the percent change" question. For percent OF a value (sales tax, discounts), see our dedicated discount or percentage calculator.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/percentage-change-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Percentage Change Calculator" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Enter the starting value.
- Enter the new value.
- Read the percentage change and absolute delta.
Frequently asked questions
- Why use absolute value of the old number?
- The standard formula is (new − old) ÷ |old| × 100. Using the absolute value means signs read intuitively: −10 → +10 is a +200% change, not −200%. This is what economic/finance reporting uses.
- What if the starting value is zero?
- Percentage change from zero is mathematically undefined (you can't divide by zero). The tool returns 'Undefined' rather than infinity. In that case, just report the absolute change instead.
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