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Forex Compounding Calculator
See how a trading account grows when you reinvest profits. Enter a starting balance, a gain per period and how many periods to run, then press Calculate to project the curve.
Written by TopicDrill Editorial Team·Updated June 2026
Balance over time
Balance Deposited
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How the compounding calculator works
Each period the tool multiplies your current balance by one plus the gain you set, then adds any deposit. Because the gain is applied to last period's balance, every win you keep in the account makes the next win slightly larger. This is the engine behind the steep curve you see on long horizons, and it is the same arithmetic as compound interest in a savings account.
The chart separates two things. The shaded area is your account balance over time, and the dashed line is the money you actually put in, your starting balance plus any deposits. The widening gap between them is reinvested profit doing the work.
A quick example
Start with 1,000 dollars and earn a steady 1 percent per trading day. After 100 trading days the account reaches about 2,700 dollars, roughly two and a half times the start, with no extra deposits. The first day adds only 10 dollars, but by day 100 a single one percent day is worth more than 25 dollars, because the base has grown.
Things to keep in mind
Constant gains never happen in real markets, and leverage that amplifies wins also amplifies losses, so treat the projection as a teaching aid. For a plain-language warning on the risks of trading, see Investor.gov. To size each individual trade so a losing streak does not wipe out the account, pair this with our forex position size calculator.
Frequently asked questions
How does compounding work in forex trading?
Compounding means you reinvest the profit from each trading period rather than withdrawing it, so the next period's percentage gain is calculated on a larger balance. A steady 1 percent a day looks modest, but applied to a growing account it produces a curved, accelerating growth path rather than a straight line.
Is a fixed daily percentage gain realistic?
No. The calculator assumes a constant gain every period to show the mathematics of compounding, but real trading produces winning and losing periods, drawdowns and variable returns. Use the result to understand the power of reinvestment, not as a forecast of what an account will actually do.
How many trading periods are in a year?
This tool counts about 252 trading days in a year because markets are closed on weekends and holidays, 52 weeks, or 12 months depending on the frequency you choose. Picking the right frequency matters: a 1 percent daily gain compounds far more often than a 1 percent monthly gain.
What does adding a deposit per period do?
The optional deposit adds a fixed cash top-up at the end of every period, on top of the percentage gain. This models a trader who funds the account regularly. Those deposits then compound alongside your profits, which is why the total deposited line on the chart rises in steps while the balance line curves above it.
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