Compounding means each period's gain is calculated on the balance grown by every gain before it. A fixed percentage return applied again and again bends a flat line into a curve. This calculator shows that curve so you can set expectations that survive contact with reality.
A period can be a month, a quarter, or a year - whatever matches how you set the gain. Real trading returns are uneven, so treat the curve as a target path, not a promise.
The math of compounding
Each period multiplies the balance by one plus the return, so over several periods the growth is exponential:
Final balance = starting balance x (1 + gain%)^periods
At 5% a period for 12 periods, $10,000 becomes about $17,959 - a 79.6% total gain, not the 60% you would get without compounding. The gap between those two numbers is the whole argument for consistency over heroics.
Why traders overestimate and blow up
The same math that rewards patience punishes greed. Plug in 30% a month and the curve looks life-changing - which is exactly why unrealistic targets push traders to oversize and break their risk rules. Sustainable returns are modest per period; the growth comes from stringing many modest periods together without a blow-up. A single large drawdown resets the compounding clock, which is why avoiding ruin matters more than chasing the biggest month.
Compounding cuts both ways: losses compound too. A run of losing periods shrinks the base every gain is calculated on, so recovery takes longer than the drawdown suggests. Keeping each period's downside small is what protects the curve - the point behind managing drawdown.
Earn the percentage first
A compounding target is only worth setting once you have proven you can produce the per-period return. Backtest your strategy across a large sample to measure the return it realistically delivers, then use that measured figure here rather than a hopeful one.
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Compounding calculator FAQ
How does compounding work in forex trading?
Each period's profit is added to your balance, so the next period's percentage gain is calculated on a larger base. Reinvesting gains this way turns a fixed return into exponential growth - 5% a month for a year is about 79.6% total, not 60%, because of the compounding effect.
Is a 5% monthly return realistic in forex?
A consistent 5% a month is ambitious but not impossible for a disciplined trader with a proven edge - it compounds to roughly 79.6% a year. The danger is treating it as a floor rather than a strong result, which pushes traders to oversize and give the gains straight back.
Why do losses hurt compounding so much?
Because compounding runs in both directions. A losing period shrinks the balance that every future gain is calculated on, so a 20% loss needs a 25% gain just to recover. Keeping drawdowns shallow protects the base your compounding depends on.