Knowledge Base

Compound Interest

A = P × (1 + r/n)^(n×t). CI = A − P

Interest earns interest — the "8th wonder of the world" (attributed to Einstein).

Compounding frequency matters: Daily > Monthly > Quarterly > Annual for same rate.

Rule of 72: Years to double = 72 / Rate%. At 12%, money doubles in 6 years.

Rule of 114: Years to triple = 114 / Rate%. Rule of 144: Years to quadruple = 144 / Rate%.

Starting 5 years earlier at same rate is equivalent to investing almost double the amount.

Pro Tip

The real magic of compounding happens after 15-20 years. Be patient — your wealth curve becomes exponential in the later years.

Compound Interest - Complete Guide

Everything you need to know about Compound Interest and how to optimize your financial strategy.

Understanding the Formula

The core calculation is based on:

A = P × (1 + r/n)^(n×t). CI = A − P

Key Concepts & Rules

Interest earns interest — the "8th wonder of the world" (attributed to Einstein).

Compounding frequency matters: Daily > Monthly > Quarterly > Annual for same rate.

Rule of 72: Years to double = 72 / Rate%. At 12%, money doubles in 6 years.

Rule of 114: Years to triple = 114 / Rate%. Rule of 144: Years to quadruple = 144 / Rate%.

Starting 5 years earlier at same rate is equivalent to investing almost double the amount.

Expert Strategy

The real magic of compounding happens after 15-20 years. Be patient — your wealth curve becomes exponential in the later years.

How to use this Calculator?

1. Enter your specific values in the input fields above.
2. The calculator will render instant results as you type.
3. Check the breakdown table for year-by-year projections.
4. Adjust the inputs to see how different scenarios impact the final result.