# Percentage Calculator

getcalc.com's Percentage (%) Calculator is an online basic math functions tool to find X is what percent of Y to measure the relative percentage score of observed value to reference value. To calculate X% of Y, percentage difference, change, increase, decrease or error, use the below calculators

## Definition and Formula: Percentage (%)

**Percentage** is an important mathematical function used to measure the certain quantity in percentage with respect to the reference value. For example, *475 is what percent of 500?* 475 is 95% of 500. Therefore, the score is measured in percentage from the reference value.