Compound Interest Calculator
Grow your money with compound interest using A = P(1 + r/n)^(nt).
Best for: Use it to compare fixed deposits or savings options, or to understand how an investment grows over years.
Input
Result
EstimateFinal amount
$22,196
What your numbers show
- You invested $10,000.00, and it grew to $22,196.40 — a 122% total gain.
- 54.9% of your final corpus is investment growth rather than your own contributions — that is compounding doing the work.
What to do next
Part of the 🌅 Retire Early pathNext: SIP CalculatorAfter lump-sum growth, people model regular monthly investing.Benefit: Compare investing once vs investing monthly. · Impact: High - regular contributions usually win.| Year | Contributed | Balance | Interest earned |
|---|---|---|---|
| 1 | $10,000.00 | $10,830.00 | $830.00 |
| 2 | $10,000.00 | $11,728.88 | $1,728.88 |
| 3 | $10,000.00 | $12,702.37 | $2,702.37 |
| 4 | $10,000.00 | $13,756.66 | $3,756.66 |
| 5 | $10,000.00 | $14,898.46 | $4,898.46 |
| 6 | $10,000.00 | $16,135.02 | $6,135.02 |
| 7 | $10,000.00 | $17,474.22 | $7,474.22 |
| 8 | $10,000.00 | $18,924.57 | $8,924.57 |
| 9 | $10,000.00 | $20,495.30 | $10,495.30 |
| 10 | $10,000.00 | $22,196.40 | $12,196.40 |
More about this result
- Type
- Exact Formula
- Method
- Standard mathematical formula
- Confidence
- High
A precise, deterministic calculation - the same inputs always give exactly this result.
Explore scenarios
Challenge: Can you grow this faster?
- Time· Most impactful— +5 yrs
- Interest rate· Least impactful— +1%
The maturity amount A is your money at the end; interest earned = A − P. Longer time and more frequent compounding both increase the result — time matters most.
- 1.TimeHigh impact
Compounding accelerates with years - the biggest lever.
- 2.Interest rateHigh impact
A higher rate compounds into a much larger balance.
- 3.PrincipalMedium impact
Scales the result but matters less than time and rate.
- 4.Compounding frequencyLow impact
More frequent compounding adds a little.
- Start as early as possible - time matters most
- Seek a higher rate within your risk comfort
- Add to the principal regularly
- Prefer more frequent compounding where offered
- Inflation often matters more than expected over the long run.
- Small rate changes can significantly affect total outcomes.
- Long-term consistency usually beats short-term timing.
Rule of 72: divide 72 by your rate to estimate doubling time - at 8%, money roughly doubles every 9 years. — U.S. SEC (investor.gov)
Challenge: Can you grow this faster?Try it →
Worth a revisit later — market returns change.
How it's calculated & sources
Method: compound-interest formula with optional periodic contributions, simulated monthly from the chosen compounding frequency. Figures are nominal unless an inflation rate is supplied.
- Constant rate throughout
- No withdrawals
- Same compounding frequency throughout
Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.
How it works
A = P (1 + r/n)nt (plus the future value of any regular contributions).
P = principal, r = annual rate, n = compounding periods/year, t = years. Continuous compounding uses A = P·ert.
Example
$10,000 at 8% compounded monthly for 10 years grows to about $22,196 — over $12,000 in interest.
Frequently asked questions
How often should I compound?+
More frequent compounding earns slightly more. Monthly is most common; daily and continuous produce marginal extra gains.
Can I add regular deposits?+
Yes — set a contribution amount and frequency, and choose whether deposits land at the beginning or end of each period.
Continue your journey
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