Exponential Growth Calculator

About this calculator

This calculator projects how a starting value grows when it increases by a fixed percentage every period, compounding on itself each time — the same mathematical shape (value × (1 + rate)^periods) that governs compound interest, population growth, and viral spread, where growth accelerates over time rather than staying constant.

It's used to model anything that compounds: an investment growing at a fixed annual return, a population or bacteria culture increasing by a constant percentage each generation, or a social media following or app's user base growing by the same percentage each month. Analysts and students use it to see how dramatically small percentage differences compound over many periods — a gap that looks tiny at period one becomes enormous by period twenty.