How does a forex compounding calculator work?

A forex compounding calculator adds any planned contribution at the start of each month, then applies the selected monthly return to that month's balance. The output is a projection, not a forecast.

Is forex compounding the same as guaranteed compound interest?

No. Compound interest is a math model. Forex returns are variable and can include losing months, slippage, and drawdown, so traders should pair the projection with strict risk management.

What is a realistic monthly return for Forex?

There is no fixed monthly forex return that is guaranteed or realistic for every trader. Use several assumptions, include flat or losing periods in your planning, and treat every result as a mathematical scenario rather than an expected outcome.

Does this calculator account for losing months?

This calculator assumes a fixed average return. In reality, trading involves losing months. Compounding works best when you manage risk to ensure losses are small and recoverable.

Should I include monthly deposits in a forex compound calculator?

Include deposits only if you realistically plan to add capital each month. Deposits can make an account-growth curve look smoother, so compare a deposit scenario against a no-deposit scenario.

Forex Compounding Calculator

How this calculator works

Add an optional contribution at the start of each month, then apply the same return assumption to the updated balance. The result is a mathematical scenario, not a forecast or promised trading return.

Direct answer: Use this forex compounding calculator to estimate how a trading account can grow when a starting balance, monthly gain, duration, and optional monthly deposit compound over time. Treat the curve as a planning scenario, then compare it with drawdown, losing months, and position-size limits.

STRATEGY PARAMETERS

Starting Balance

Monthly Gain (%)

Duration (Months)

Monthly Contribution (Optional) Added before growth is calculated each month

PROJECTED GROWTH

Ending Balance $0.00

Why does this number look like 1E24?

For extremely large values, this calculator switches to scientific notation. For example, 1E24 means 1 × 10²⁴, which is a 1 followed by 24 zeros.

Growth From Returns + $0.00

Total Contributed $0.00

Growth Factor 0x

Month	Contribution	Growth	Balance

📚 Recommended reading

Want to go deeper on position sizing, drawdown control, and risk of ruin?
Start with a fixed risk-per-trade plan, then scale lot size only when the account balance actually changes.

Risk Per TradeSet a realistic fixed-risk plan before projecting growth. Position Size CalculatorTranslate each new balance into trade size. Risk Management BooksStudy drawdown control, sizing, and survival.

Example: a fixed 5% monthly scenario

A fixed 5% monthly input shows how compounding behaves when the same positive return repeats. Real trading results do not arrive in a smooth sequence and can include flat or losing months.

Use it as a comparison case: test 2%, 5%, and 10% assumptions, then compare them with a no-growth case. Do not treat any input as a target or expected return.

Assumption: The same return is applied once per month.
Contributions: Optional contributions are added before that month's return.
Limit: The model does not simulate losses, fees, slippage, taxes, or changing risk.

Risk check: If your balance changes, recalculate position size from your current balance and chosen risk limit. The Position Size Calculator can help translate a risk amount into lots.

Mental Math: The Rule of 72

The Rule of 72 is a rough mental-math approximation: divide 72 by a fixed percentage rate to estimate the number of periods needed to double. It is not a forecast for variable trading returns.

5% Monthly: Doubles every ~14.4 months.
10% Monthly: Doubles every ~7.2 months.
20% Monthly: Doubles every ~3.6 months (Aggressive).

Reality check: The examples assume every month is positive at the same rate. Actual returns can be negative, costs reduce results, and larger position sizes can increase both gains and losses.