How do I calculate percentage change? Enter your numbers above and the result updates instantly. For example: From: 150 · To: 180 → Increase: 20%.
Is this Percentage Change Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for percentage change. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.