Calculating the value of your startup, especially before launch, can be challenging. However, there are several methods you can consider to estimate your startup's value. Keep in mind that valuation is as much an art as it is a science, and different investors may use different methods. Here are some common approaches:

Comparable Company Analysis (CCA):

Look at the valuation of similar companies in your industry or niche that have recently raised funds. Consider factors such as stage, growth potential, and market conditions.
Discounted Cash Flow (DCF) Analysis:

Estimate the future cash flows your startup is expected to generate and discount them to present value. This method requires making assumptions about future revenues, expenses, and growth rates.
Market Multiples:

Determine industry-standard valuation multiples, such as the price-to-earnings (P/E) ratio or price-to-sales (P/S) ratio, and apply them to your startup's projected financial metrics.
Cost-to-Duplicate:

Estimate the cost it would take for someone to replicate your startup. This method considers the cost of building the product, acquiring customers, and establishing a similar market presence.
Angel Investors' Rule of Thumb:

Some angel investors use a rule of thumb, like the "Berkus Method" or the "Scorecard Valuation Method," which assigns values to various aspects of your startup, such as the quality of the management team, the size of the opportunity, and the prototype or product development.
Stage-Based Valuation:

Since your startup is pre-launch, the valuation might be based on the specific stage of development (e.g., prototype, beta testing, user acquisition). Each stage may have different risk factors and potential for value creation.
Investor Negotiation:

Ultimately, the value of your startup is what you and potential investors agree upon. Be prepared to negotiate, and be aware that different investors may have different perceptions of risk and potential return.
Convertible Notes or SAFE Agreements:

Some early-stage startups opt for convertible notes or Simple Agreement for Future Equity (SAFE) agreements instead of a firm valuation. These instruments delay the valuation discussion until a later funding round.
Before presenting your startup to potential investors, it's crucial to have a well-prepared pitch that clearly communicates your value proposition, market opportunity, and growth strategy. Investors will likely be interested in your team, the problem you're solving, and your execution plan.

Consider seeking advice from mentors, industry experts, or financial advisors who can provide insights into your specific market and help you refine your valuation approach. Additionally, remember that valuation is not a one-size-fits-all process, and it often involves a degree of subjectivity and negotiation.