How do you calculate performance ratio's?

To calculate a performance ratio, you typically divide one metric by another relevant metric to assess efficiency or productivity. For example, in finance, the Return on Investment (ROI) is calculated by dividing net profit by the total investment and multiplying by 100 to express it as a percentage. In a business context, you might calculate the efficiency ratio by dividing operating expenses by total revenue. Always ensure the metrics used are comparable and relevant to the specific performance being analyzed.