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Simple or compound interest at any compounding frequency — ending balance, total interest, APY, a growth chart, and a year-by-year breakdown.
Interest is added annually and then earns interest itself.
With compound interest each period's interest is added to the balance, so the next period earns interest on a bigger number. Compounding more often raises the effective rate — 8% compounded annually is really 8% a year.
Ending balance
2,158.92
Initial investment
1,000.00
Total interest
1,158.92
Effective annual rate (APY)
8%
what the nominal rate actually earns once compounding is applied
What the ending balance is made of
Growth multiple
2.16×
ending balance ÷ what you put in
Interest share
53.7%
of the final balance
Interest in final year
159.92
the last year earns the most
Money doubles
year 10
first year the balance hits 2×
The green line is your balance; the grey dashed line is your original investment, which never changes. The gap between them is interest — it widens each year as interest starts earning interest.
| Year | Balance | Interest that year | Total interest | Your money | Make-up |
|---|---|---|---|---|---|
| 0 | 1,000.00 | — | 0.00 | 1,000.00 | |
| 1 | 1,080.00 | +80.00 | 80.00 | 1,000.00 | |
| 2 | 1,166.40 | +86.40 | 166.40 | 1,000.00 | |
| 3 | 1,259.71 | +93.31 | 259.71 | 1,000.00 | |
| 4 | 1,360.49 | +100.78 | 360.49 | 1,000.00 | |
| 5 | 1,469.33 | +108.84 | 469.33 | 1,000.00 | |
| 6 | 1,586.87 | +117.55 | 586.87 | 1,000.00 | |
| 7 | 1,713.82 | +126.95 | 713.82 | 1,000.00 | |
| 8 | 1,850.93 | +137.11 | 850.93 | 1,000.00 | |
| 9 | 1,999.00 | +148.07 | 999.00 | 1,000.00 | |
| 10 | 2,158.92 | +159.92 | 1,158.92 | 1,000.00 |