Year-Over-Year Growth Calculator

About this calculator

Year-over-year (YoY) growth compares a metric in the current period against the same period one year earlier, expressed as a percentage: YoY growth = (current value − prior-year value) / prior-year value × 100. Comparing against the same period last year, rather than the immediately preceding period, cancels out seasonal swings — a retailer's December sales are naturally compared to last December, not last November.

This metric is a staple of financial reporting: companies quote YoY revenue growth in earnings releases, SaaS businesses track YoY growth in monthly or annual recurring revenue, retailers report same-store sales YoY, and economists watch YoY changes in GDP or inflation. This calculator takes your two period values and returns the YoY growth percentage directly.