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Compound Interest Calculator

The compounding story sounds tempting: earn a little each period, roll the interest on interest, and given enough time it doubles. Enter your principal, return per period and number of periods, and this works out the final value, total gain and how many times it multiplies — and along the way lets you see just how shaky that "steady high return" premise really is.

COMPOUND · GROWTH
Final value after rolling
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Compounded result
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1×10×+
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How to use this compound interest calculator

Three numbers. The principal is the money you start with; the return per period is the percentage you assume "each period" can earn; the periods is how many periods to roll. The "period" here is an abstract unit — think of it as a month or a week, your call — the point isn't the unit but whether you dare believe "every period lands this return reliably." Once filled, the right side gives the final value, the total gain, and the multiple shown by the half-circle gauge: wherever the needle points is how many times your principal has been magnified.

Try moving the return per period from 2% to 5% to 10% and watch the final value change. 24 periods, 1,000 principal, 2% each: the final value is about 1,608 — sounds nice. But if someone really promised you "a steady 10% a month," this tool will tell you that after 24 periods it's nearly ten thousand — your principal multiplied almost tenfold. The issue isn't whether the math is right; it's whether that premise is realistic. That's exactly what this tool wants you to see: the compounding formula gets more exaggerated the further out it runs, and past a point, that's the cue to be wary.

Why compounding is a double-edged sword

The math of compounding isn't wrong: each period's gain folds back into the principal, and the next period earns on a bigger base, the snowball rolling larger and larger. Its true friends are time and stability. But in crypto, that latter "stability" barely exists — no strategy can guarantee a positive return every period, and the moment the market turns, what you earn isn't compounding but compounding losses: lose 10% on your principal, then 10% again, and that's not 20% — it's consecutive discounts, shrinking faster than your intuition expects, and a lost principal needs an even bigger gain to win back.

So when you see pitches like "1% a day" or "a steady 8% a month," first roll it out for a year with this tool — the annualized figure that comes out is usually absurdly high, too high to be genuinely sustainable. Behind numbers like that lies undisclosed high risk, or even an outright Ponzi. For the basic concepts of compounding and annualization, see Investopedia's explainer on compound interest.

Risk: this tool assumes "a fixed return every single period," and that assumption basically doesn't hold in real crypto trading. No legal strategy can steadily deliver high, certain returns; products promising such returns either lean heavily on luck or are scams outright. Compounding magnifies gains and equally magnifies losses, and consecutive losses eat your principal faster than you'd think. This is a mathematical illustration only, not a return promise, and certainly not investment advice. Crypto trading is risky.

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Related tools and guides

For a more realistic, lower-stress way to accumulate over the long run, see the DCA Return Calculator and How to DCA Bitcoin; before chasing returns, frame the risk first with the Position / Risk Calculator; for how leverage magnifies both sides of compounding, see the Leverage PnL / Risk Calculator; and to spot high-return traps, read The Most Common Beginner Mistakes.