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Forex compounding calculator

Compounding turns a modest per-period return into a large multiple, given enough periods. This shows the mechanics, with the caveat that no account produces the same return every month.

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Short answer

Ending balance = start × (1 + rate)^periods. $1,000 growing 5% a month for 24 months becomes about $3,225. The account roughly triples, without a single month above 5%. That is the whole argument for compounding, and the reason it is so easy to sell people an unrealistic version of it.

Key takeaways

  • This is arithmetic, not a projection. It assumes an identical return every period, which no trading account has ever produced.
  • Compounding is the mechanism behind every "turn $500 into $50,000" pitch. The mechanism is real; the constant input is fiction.
  • A fixed percentage return on a growing balance requires a growing position size, which brings liquidity, slippage and psychology into play.
  • Losing periods do more damage than winning periods of the same size do good. See the drawdown calculator.

How compounding works

Compounding means each period's return is calculated on the balance produced by the previous period, so gains earn gains. The formula is:

Final = Start × (1 + r)n

The exponent is what makes it non-obvious. Five percent a month is not 60% a year, it is about 80%. Over three years it is not 180%, it is roughly 480%. The gap between the intuitive linear answer and the real one grows with every period, and it is why people underestimate long horizons and overestimate short ones.

Why this number is not a forecast

Every assumption the calculation makes is false for a real trading account, and it is worth being explicit about which:

  • Returns are not constant. Real equity curves have flat months and losing months. A sequence averaging 5% with a −15% month somewhere in it ends materially below the smooth version, because the loss compounds too.
  • Position size has to grow. Holding a 5% monthly return on a balance that has grown tenfold means trading ten times the size. Slippage grows, and so does the psychological weight of each trade.
  • Sequence matters. The same set of returns in a different order produces the same final figure only if no capital is added or withdrawn. Add deposits and order starts to matter a great deal.
  • Costs are ignored. Spread, commission, swap and taxes all compound against you.

Use this tool to build intuition about the shape of exponential growth, and to sanity-check claims. If someone advertises 20% a month, this calculator says $1,000 becomes $8.9 million in five years. Being able to produce that number quickly is the fastest way to recognise a claim that cannot be true.

Trading involves risk of loss. Past performance is not indicative of future results, and no return is guaranteed.

The same calculators are inside the MarketPro app

MarketPro ships position size, pip value, margin, profit, risk-to-reward and compounding calculators alongside the signal feed, so you can size a trade on the same screen you read it on. Download free. One vetted signal every day, no card needed.

Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed . How we produce signals and content · About MarketPro

FAQ

Forex compounding calculator: questions

Is 10% a month realistic in forex?
Sustained over years, no. Ten percent monthly compounds to roughly 214% a year, which would outperform every documented professional track record by a wide margin. Individual months at that level happen; averaging it across years does not. Treat any offer built on that assumption with deep scepticism.
Should I compound or withdraw my profits?
That is a personal decision about risk, not a mathematical one. Compounding grows the account and grows the size of every future loss with it. Withdrawing locks in gains and slows growth. Many traders compound to a target account size and withdraw everything above it, which caps position size at a level they are comfortable trading.
What return per period should I enter?
If you are modelling your own trading, use your actual historical average over as many months as you have, including the bad ones. If you have no history, the honest input is a question mark, and the useful exercise is to run several scenarios (including negative ones) rather than one optimistic figure.
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Not investment advice. Past performance is not indicative of future results.