MRR and ARR Calculator MCP Connector for Claude

Building a financial forecast requires more than just total revenue. The challenge is accurately separating the source of growth: where did the money come from? Was it new customers, existing customer upgrades, or was it lost to cancellations?

The MRR and ARR Calculator solves this by providing granular tracking for every component of recurring revenue--New, Expansion, and Churn. It connects raw subscription data (plan price, unit count) to actionable financial metrics.

Mechanism: The system uses specialized tools to process your time-series data. First, the calculate_mrr tool processes a batch of subscriptions to yield the total MRR for a period. This result is then passed to aggregate_mrr_components to separate New, Expansion, and Churn revenue streams. Finally, the calculate_arr and get_metrics_summary tools take these core metrics to provide annualized forecasts (ARR) and key ratios like ARPU.

Advantage: Instead of a single gross number, you get a full financial picture: how fast are you growing (Net New MRR), and what is the true value of your customer base? This allows for precise forecasting and strategic decision-making.