Exponential Growth Calculator

Calculate final value, growth rate, time, or initial value for exponential growth or decay using y = a · (1 + r)^t or y = a · e^(kt).

Frequently Asked Questions

How long until I double my money?

Doubling time for continuous growth = ln(2) / r. At r = 0.07 (7%), that is ~9.9 years. For discrete, use log(2) / log(1.07) ≈ 10.24 years.

Is exponential growth realistic?

Only over limited time. Bacterial colonies, COVID-19 cases, and capital all eventually saturate or face limits. Use logistic growth for capped systems.

What about half-life?

Same formula with r < 0. Half-life = -ln(2) / r for continuous decay, or -log(2) / log(1 + r) for discrete.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.