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Compound Interest Calculator

Calculate compound interest and investment growth

$
$
%
years
Final Balance
$144,573
After 20 years
Total Contributions
$58,000
Your money invested
Total Interest Earned
$86,573
60% of final balance

Balance Breakdown

40%
60%
Contributions: $58,000Interest: $86,573

Rule of 72

At 7% annual return, your money will double approximately every 10.3 years.

YearContributionsInterestBalance
0$10,000$0$10,000
2$14,800$1,834$16,634
4$19,600$4,662$24,262
6$24,400$8,633$33,033
8$29,200$13,918$43,118
10$34,000$20,714$54,714
12$38,800$29,246$68,046
14$43,600$39,776$83,376
16$48,400$52,603$101,003
18$53,200$68,070$121,270
20$58,000$86,573$144,573

The Power of Compound Interest

Albert Einstein allegedly called compound interest "the eighth wonder of the world." Here's why:

$10,000 invested at 7% annually:

  • After 10 years: $19,672
  • After 20 years: $38,697
  • After 30 years: $76,123

Compound Interest Formula

`` A = P(1 + r/n)^(nt) ``

Where:

  • A = Final amount
  • P = Principal (initial investment)
  • r = Annual interest rate (decimal)
  • n = Number of times interest compounds per year
  • t = Number of years

Compounding Frequency Impact

$10,000 at 10% for 10 years:

FrequencyFinal Value
Annual$25,937
Quarterly$26,851
Monthly$27,070
Daily$27,179

Tips for Maximizing Compound Growth

1. Start early: Time is your biggest advantage 2. Be consistent: Regular contributions add up 3. Reinvest dividends: Let earnings compound 4. Minimize fees: High fees erode compound growth

Frequently Asked Questions

What is compound interest?

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, your money grows exponentially because you earn interest on your interest.

How often should interest compound?

More frequent compounding results in higher returns. Daily compounding earns slightly more than monthly, which earns more than annual. For most practical purposes, the difference between daily and monthly is minimal.

What is the Rule of 72?

The Rule of 72 estimates how long it takes to double your money. Divide 72 by the annual interest rate: at 8% interest, money doubles in approximately 9 years (72/8 = 9).

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