Valuing your business before a sale is a critical step that requires careful consideration and planning. Have a look at online business selling agent websites; they might have similar-sized businesses live as listings to give you a guide. Additionally, here are some effective strategies to help you determine the value of your business:

Financial Statements Review: Start by gathering your financial statements, including profit and loss statements, cash flow statements, and balance sheets for the past few years. A thorough analysis of these documents can provide insight into your business's profitability and financial health.

Market-Based Valuation: Research the market to see how similar businesses are valued. This can include looking at recent sales in your industry or geographic area. Tools like business brokers or online valuation calculators can help provide benchmarks.

Income-Based Valuation: This method estimates the value of your business based on the income it generates. Using established methods like the Discounted Cash Flow (DCF) analysis can help forecast future earnings, discounting them back to present value.

Asset-Based Valuation: If your business has significant physical or intangible assets, consider this approach. Calculate the total value of your assets, including inventory, equipment, and property, minus any liabilities.

Consider Intangible Assets: Don’t forget to factor in intangible assets such as brand value, customer relationships, and employee expertise. These can significantly contribute to your business’s overall value.

Engage a Professional Valuator: Hiring a business appraiser or broker can provide an objective analysis and help ensure that all relevant factors are considered. They bring expertise and can assist in accurately reflecting your business's worth.

Evaluate Industry Trends and Economic Factors: Understand the current market conditions and trends in your industry. This context can influence your business's valuation and attract potential buyers.

Your next steps could include conducting the financial review and considering whether to engage a professional valuator if you feel the need for a more detailed analysis.