To calculate the return on investment (ROI) of your partner training program, you need to estimate the benefits and costs of the program and divide the benefits by the costs. The benefits are the additional revenue or profit that you generate from your partners as a result of the training program, which can be estimated by multiplying the partner revenue growth rate by the average partner revenue or profit margin. The costs are the expenses that you incur to design, deliver, and maintain the training program, which can be estimated by adding up the direct and indirect costs of the program, such as content development and update, platform and technology fees, instructor and facilitator fees, travel and accommodation expenses, marketing and promotion expenses, opportunity costs of time and resources, administrative and operational overheads, and quality and compliance costs. The ROI is the ratio of the benefits to the costs, expressed as a percentage, which can be calculated by dividing the benefits by the costs and multiplying by 100.