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Calctive

Compound Interest Calculator

Calculate the power of compound interest and see how your investments can grow exponentially over time with regular contributions and different compounding frequencies.

Input Values

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Annual contribution: $6,000

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💡The Power of Compound Interest

  • •Albert Einstein called compound interest the "eighth wonder of the world"
  • •More frequent compounding (daily vs. annually) accelerates growth significantly
  • •Regular contributions can dramatically increase your final amount over time
  • •Starting early is the key - even 5 extra years can double your returns
  • •The Rule of 72: Divide 72 by your interest rate to estimate doubling time

Results

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Enter values and calculate

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How to Use

  1. 1Enter your initial principal investment amount
  2. 2Input the annual interest rate (APR)
  3. 3Select the time period for your investment (1-50 years)
  4. 4Choose how often interest compounds (annually to daily)
  5. 5Add optional monthly contributions to boost growth
  6. 6Select contribution timing (beginning or end of period)
  7. 7Click Calculate to see your investment grow exponentially
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Formula

A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]  Where: A = Final Amount P = Initial Principal r = Annual Interest Rate (decimal) n = Compound Frequency per year t = Time in years PMT = Regular Contribution
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Common Use Cases

$10,000 invested at 7% annually for 20 years with $500 monthly additions
Retirement planning with daily compounding over 30 years
Compare different compounding frequencies to maximize returns
See the power of starting early vs. late in your investment journey