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See how your money grows over time with the power of compounding interest and regular contributions.
Future Value
$20,097
After 10 years at 7% compounded monthly
Total Contributions
$10,000
Interest Earned
$10,097
Interest Multiplier
2.01×
Compound Periods/Yr
12
| Year | Balance | Total Contributed | Interest Earned |
|---|---|---|---|
| Year 1 | $10,723 | $10,000 | $723 |
| Year 5 | $14,176 | $10,000 | $4,176 |
| Year 10 | $20,097 | $10,000 | $10,097 |
Compound Interest Calculator uses the standard FV formula to project how any principal grows with compound interest at any frequency — annually, quarterly, monthly, or daily — with optional regular contributions.
Compound Interest Calculator is a high-performance utility designed to help users streamline their workflow. Built with modern web technologies, it ensures fast processing times and high-quality outputs directly in your browser.
Future value = principal × (1 + r/n)^(n×t) + contributions × ((1+r/n)^(n×t) − 1)/(r/n), where r = annual rate, n = compounds per year, t = years. Contributions are treated as per-period amounts scaled from monthly. Results are projections; actual returns depend on rate consistency.
Compound interest means earning interest on your interest. Unlike simple interest (which only applies to the principal), compound interest grows exponentially over time — the longer you wait, the faster it grows.
More frequent compounding earns slightly more. Daily compounding earns marginally more than monthly, which beats quarterly. The difference matters more over long periods and at higher rates.
For savings accounts, use your current APY (typically 4–5% in 2026). For investments, the S&P 500 has averaged ~10% nominal annually over the long run, with ~7% inflation-adjusted.
Divide 72 by your annual interest rate to estimate how many years it takes to double your money. At 7%, money doubles in about 10 years (72 ÷ 7 = 10.3).
Find out exactly how much to save each month to reach any financial goal by a target date.
Project investment growth over any time horizon with contributions, CAGR, and inflation-adjusted returns.
Project your 401(k) balance at retirement with employer match and salary growth.