Percentage Change Calculator

This calculator works in two modes: calculate the % change between two prices, or find a target price from a starting price and a % move.

% Change = (New Price − Old Price) ÷ Old Price × 100
Target Price = Starting Price × (1 + Target % ÷ 100)

Note the asymmetry: a 25% gain is not cancelled by a 25% loss. A 25% gain from $80,000 = $100,000, but a 25% loss from $100,000 = $75,000 — not back to $80,000. This asymmetry is why loss prevention matters more than chasing gains.