Compound Growth Calculator

The tool accepts numeric inputs for an initial metric, a per-period growth rate, and the number of periods to project. It supports constant growth or a user-supplied sequence of per-period rates to capture seasonality, campaign lifts, or strategic shifts. Outputs include per-period values, a final projection, and optional trajectory summaries for comparison.
Conceptually, growth is applied using discrete compounding: each period multiplies the current value by (1 + r). For a constant rate r over n periods, the final value is P0*(1+r)^n; with varying rates, the value is computed iteratively by multiplying by (1 + r_i) for each period. The tool can store multiple trajectories to enable side-by-side scenario analysis and can export results for reporting or downstream modeling.
Who benefits includes SEO analysts forecasting traffic, content teams planning outreach, marketers evaluating budgets, and product managers modeling growth ideas. Its unique value lies in fast, deterministic outputs that reflect different growth assumptions without spreadsheet dependence, and in providing structured outputs suitable for reports and subsequent analyses. Core features encompass validation of required inputs, optional per-period rates, and support for multiple trajectories. Use cases span monthly traffic projections, campaign lift comparisons, and revenue forecasting, focusing on reproducibility and transparent calculations for quick what-if planning.