Stock Market Simulators: How Practice Trading Works
By Forex & Brokers DeskUpdated Nov 10, 2026
Key takeaways
- Long profit or loss equals exit price minus entry price, times shares, minus total fees.
- A $10,000 balance buying 50 shares at $40 and selling at $43 with $2 in fees nets $148, or 1.48%.
- After 20 or 30 logged trades, review win rate, average gain versus average loss, and largest drawdown.
- FINRA requires $25,000 in margin equity for four or more day trades in five business days.
A stock market simulator lets you place buy and sell orders with virtual money and track the result as if the trades were real. Nothing is at risk, which makes paper trading useful for learning order types, testing a plan, or practicing day trading routines before funding a brokerage account.
What Goes Into a Simulated Trade
Every paper trade rests on the same few inputs:
- Starting balance: the virtual cash you begin with. Pick a figure close to what you would actually invest, or your position sizes will teach the wrong habits.
- Ticker and direction: buying (long) profits if the price rises; selling short profits if it falls.
- Quantity: the number of shares.
- Entry and exit price: where the position opens and closes.
- Costs: commissions or fees, if you choose to model them.
The Formula Behind the Result
For a long position:
Profit or loss = (exit price − entry price) × shares − total fees
For a short position, reverse the price difference: (entry − exit) × shares − fees.
Return on account = profit or loss ÷ starting balance × 100
Hypothetical example: with a $10,000 virtual balance, you buy 50 shares at $40 and sell at $43, paying $1 per side in fees. The result is (43 − 40) × 50 − 2 = $148, or a 1.48% return on the account. The same move on 200 shares would produce $598, which shows how quantity, not the price change alone, drives the outcome.
How to Use the Result
Keep a log of every simulated trade: entry reason, planned stop, outcome. After 20 or 30 trades, look at win rate, average gain versus average loss, and the largest drawdown.
What a Simulator Leaves Out
- Fill quality: simulated orders usually fill at the quoted price. Real orders can suffer slippage, partial fills, or no fill at all in thin or fast markets.
- Market impact: your virtual order never moves the price.
- Psychology: losing fake money does not trigger the hesitation or revenge trading that real losses can.
- Account rules: in the US, FINRA’s pattern day trader rule requires $25,000 in equity for margin accounts that make four or more day trades within five business days. Practice accounts often do not enforce it, so a day trading simulator can let you run a strategy your real account could not.
- Taxes: gains in a live account may be taxable; simulated gains are not.
Treat simulated profits as an upper estimate.
The Bottom Line
Paper trading suits anyone learning order types or rehearsing a day trading routine before funding a brokerage account. Start with a balance near what you would really invest, model fees, and log each trade's reasoning and stop. Because simulators skip slippage, emotional pressure, account rules, and taxes, read any simulated profit as the best case a live account could reach.
