Free online percentage change calculator. Calculate percent increase, percent decrease, percentage difference, and reverse values. Instant results, pure client-side.
A clean, fast percentage change calculator for everyday math and business analysis. Supports five calculation modes: percentage change between two values, percentage increase, percentage decrease, reverse calculation to find the original value, and percentage difference. All calculations happen instantly in your browser — no server, no delay, no data sent anywhere.
Yes, completely free. No registration, no ads, no limits.
Select "Percentage Change" mode, enter the old value and the new value. The result shows the percentage increase or decrease, plus the absolute difference.
Yes! Select "Reverse Calculate" mode, enter the new value and the percentage change. The calculator will compute the original value for you.
Yes, all modes support negative numbers and decimals.
Absolutely. All calculations happen inside your browser. Nothing is sent to any server.