A forex compounding plan: the arithmetic, the losing months and the limits

Compounding looks smooth in a calculator and never is in real trading. The exact arithmetic, what losses do to it and the decisions a plan has to make.

What compounding is, and what a plan has to add

Compounding means that each period’s gain is calculated on the balance you now have, including earlier gains, instead of on the balance you started with. Gain 5 per cent on $1,000 and you have $1,050. Gain 5 per cent again and the second gain is $52.50, not $50. Over many periods the difference becomes large, which is why compounding calculators are popular and why their results look so tempting.

A calculator only does the arithmetic. A plan has to deal with what the arithmetic leaves out: losing months, risk per trade, withdrawals and the fact that no trader earns a constant return. This page shows the arithmetic and then the parts a calculator ignores. It is not a forecast and not advice: nothing here says you will, or can, earn any particular return.

The arithmetic, with invented rates

Months	At 3% a month	At 5% a month	At 8% a month
6	$1,194	$1,340	$1,587
12	$1,426	$1,796	$2,518
24	$2,033	$3,225	$6,341

Starting from $1,000, those are the balances after a steady gain every month, with no withdrawals and no losing month. The 5 per cent column ends at $1,795.86 after 12 months. Gaining 5 per cent of the starting balance every month, without compounding, gives $1,600.00. The gap between those two numbers is the whole effect of compounding in the first year. The rates are examples to show the shape of the curve. They are not targets and they are not typical.

You can try your own numbers in the forex compounding calculator.

What happens when a month is a loss

Real results do not rise smoothly. Compare the same $1,000 over 12 months under three invented paths:

Path	Balance after 12 months
Every month +5%	$1,795.86
Ten months +5%, two months -5%	$1,470.08
Eleven months +5%, one month -10%	$1,539.31

Two small losing months cost about a sixth of the ending balance, and one bigger loss costs a similar amount. Losses hurt compounding more than gains help it, because a loss shrinks the base the next gain is calculated on. That is also why recovery gets harder the deeper you fall:

Loss from a peak	Gain needed to get back
5%	5.3%
10%	11.1%
20%	25.0%
30%	42.9%
50%	100.0%

A 50 per cent loss needs a 100 per cent gain just to return to the start. The drawdown recovery calculator works out the figure for any loss.

Four things a compounding plan has to decide

Risk per trade, not a target return. A fixed percentage of your balance at risk per trade is what compounds in practice: the position gets larger when the balance grows and smaller when it shrinks. The position size calculator turns that percentage into lots.
A loss limit. Decide in advance how much you will lose in a month before you stop, so a bad stretch cannot do the damage the table above shows. See how to set monthly trading goals.
Withdrawals. If you take money out, you are not compounding that part. Decide what share stays in the account.
Costs. Spread, commission and swap come out of every trade, so use net results. See MT5 swap explained.

Use your own numbers, not a target

The question that makes a compounding plan honest is: what did my account actually do? A journal answers it. Your monthly net result, the number of winning months, your worst month and your largest drawdown come from your own history, and they replace the hopeful rate you would otherwise type into a calculator. AI Trading Journal builds those figures from your MetaTrader 5 history: the Progress page shows the growth curve and a table of every month, and the dashboard can show Daily, Weekly, Monthly or All-time results. See trading progress and goals.

A short worksheet

Step	Your number
Starting balance	From your account
Risk per trade (percent of balance)	Your rule
Average result per trade in R, from your journal	Your history
Trades in a normal month	Your history
Your worst month so far	Your history
Monthly loss limit	Your rule
Share of profit you withdraw	Your decision

Fill that in from your records. If you do not have records yet, the first goal is to collect them, not to pick a rate. The free MT5 journal template is a place to start.

Honest limits

Compounding calculators assume a constant return, which almost never happens.
A high rate on a small account does not scale: costs, slippage and your own behaviour change as the balance grows.
Past results say nothing certain about the next month.
This page is educational. It does not recommend a return, a strategy or a risk level.

Frequently asked questions

What is a forex compounding plan?

A plan for growing an account by reinvesting gains, with rules for risk per trade, a monthly loss limit, withdrawals and costs. A calculator only does the arithmetic of compounding.

Is compounding realistic for forex traders?

The arithmetic is exact, but results are not smooth. Losing months hurt compounding more than gains help it, so a plan should be built on your own record, not on a hoped-for rate.

How do I calculate compound growth?

Multiply the balance by one plus the periodic rate for every period. For example, 5 percent a month for 12 months multiplies the balance by 1.05 twelve times.

How much do I need to gain to recover a loss?

More than the loss itself: a 20 percent loss needs a 25 percent gain and a 50 percent loss needs 100 percent.

Where do I get my real monthly return?

From your own trade history. A journal that reads your MT5 account shows the month-by-month results, the worst month and the drawdown.

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