# Viral Coefficient Calculator MCP > Viral Coefficient Calculator MCP lets you figure out if your product is actually growing through word-of-mouth or if you're just spinning your wheels. It handles the math for K-factors, tells you if your growth is sub-critical or viral, and projects out how many cycles it'll take to double your user base. It's built for anyone who needs to know if their viral loops are actually working. ## Overview - **Category:** marketing - **Price:** Free - **Tags:** virality, k-factor, growth, forecasting, analytics ## Description Most growth teams spend way too much time in spreadsheets trying to guess if their product is actually growing through word-of-mouth or if they're just spinning their wheels. You want to know the actual numbers, not just a feeling. This MCP handles the heavy lifting by connecting your agent directly to growth modeling logic. Instead of manually calculating coefficients and trying to project trajectories, you just tell your agent what the current invite stats are. It'll give you a clear classification of your growth status, whether you're stuck in a sub-critical loop or actually hitting that viral tipping point. Since Vinkius hosts this in their catalog, you can plug it into your existing workflow and get answers in seconds. You'll stop guessing about how many cycles it takes to hit your next milestone and start making decisions based on hard forecasts. It's about moving from a vague sense of progress to a clear roadmap of where your user base is headed. You can finally see the difference between a lucky spike and a sustainable trend. This means you can tell your team exactly what to prioritize next. You won't have to stay up late trying to reconcile different data points or arguing over what the current growth rate really is. You get a single source of truth for your virality metrics that actually makes sense for your long-term goals. ## Tools ### estimate_doubling_period Tells you how many viral cycles it takes to double your total users. ### evaluate_virality Classifies your growth as sub-critical, critical, or viral based on your K-factor. ### forecast_growth_trajectory Predicts your user count over a set number of future cycles. ## Prompt Examples **Prompt:** ``` What is my current virality status if each user sends 5 invites and 10% of them sign up? ``` **Response:** ``` Your K-factor is 0.5, which places your growth status in the Sub-critical category. ``` **Prompt:** ``` How many cycles do I need to double my users if my K-factor is 1.2? ``` **Response:** ``` Approximately 4 full growth cycles are required to reach twice your current user base. ``` **Prompt:** ``` Forecast my growth for the next 3 cycles starting with 1000 users and a K-factor of 1.5. ``` **Response:** ``` Cycle 1: 2500 users, Cycle 2: 6250 users, Cycle 3: 15625 users. ``` ## Capabilities ### Classify current growth status Identify if your growth is sub-critical, critical, or viral. ### Calculate the K-factor Get the exact coefficient for your viral growth loop. ### Estimate doubling cycles Find out how many cycles it takes to double your user base. ### Forecast future user counts Project your user expansion over a set number of cycles. ### Identify growth bottlenecks See where your growth loop is stalling or failing to scale. ### Map out expansion trajectories Visualize the path your user base will take over time. ## Use Cases ### Checking a new referral program A growth lead wants to know if a new invite button is working. They ask the agent to use `evaluate_virality` with a 5% conversion rate on 10 invites. ### Projecting user milestones A PM needs to tell the CEO when they'll hit 10k users. They ask the agent to use `forecast_growth_trajectory` starting from 2k users with a 1.2 K-factor. ### Evaluating marketing spend A marketer is trying to see if they need more spend. They use `estimate_doubling_period` to see if the current viral loop can double the base in under 5 cycles. ### Verifying viral status A founder wants to know if they are actually viral yet. They feed current stats into `evaluate_virality` to get a Sub-critical or Viral classification. ## Benefits - Stop guessing your growth status. Use `evaluate_virality` to see exactly where you stand on the curve right now. - Predict your milestones with `forecast_growth_trajectory` to tell your team exactly when to expect the next big jump in users. - Cut out the spreadsheet math. Use `estimate_doubling_period` to get an instant answer on how long it takes to hit 2x growth. - Make better budget decisions. Know if your K-factor is high enough to justify spending on new features instead of just more ads. - Spot plateaus early. Use these tools to see if your growth is slowing down before it actually hits a wall. ## How It Works The bottom line is you get a clear roadmap of your product's virality without the manual math. 1. Provide your current invite and signup rates to your agent. 2. The agent calls the MCP to run the growth models. 3. You get a status classification and a projected growth timeline. ## Frequently Asked Questions **What does the Viral Coefficient Calculator do?** It calculates your K-factor and tells you if your growth is sub-critical, critical, or viral. **How do I find out when my user base will double?** You can use the `estimate_doubling_period` tool to see how many viral cycles are required to hit that 2x mark. **Can the Viral Coefficient Calculator project my growth?** Yes, the `forecast_growth_trajectory` tool lets you see your projected user count over a specific number of cycles. **What is a K-factor?** It's the number of new users each existing user brings in. The MCP evaluates this to classify your growth status. **Is this tool for small startups only?** No, it works for any product using a viral loop, regardless of your current user count. **Which AI clients support the Viral Coefficient Calculator?** It works with any MCP-compatible client like Claude, Cursor, Windsurf, or VS Code. You just connect it through Vinkius to get started. **Do I need a separate API key to use the Viral Coefficient Calculator?** No, you don't need one. Vinkius handles the connection for you, so you just subscribe to the MCP and your agent gets access to the tools immediately. **Does the Viral Coefficient Calculator save my private user numbers?** No, it doesn't store your data. The MCP processes the numbers you provide in the prompt to run calculations and doesn't keep a record of them.