Day Trade Calculator: Know Your Numbers Before You Click Buy
Enter your entry, exit, and stop-loss prices to see your exact profit or loss, your risk-to-reward ratio, and the maximum position size that keeps a single trade within your own risk limit.
Enter your trade details
Runs entirely in your browser. Nothing here is stored, saved, or sent anywhere, and this is not connected to any live brokerage account.
Long means you profit when the price rises. Short means you profit when the price falls, borrowing and selling first, then buying back later.
Purely a display symbol using ISO 4217 currency codes. The math works identically regardless of which currency your account is funded in.
The price you got filled at entering the trade, and the price you got filled at closing it. Leave exit blank if you just want to check a planned target.
Your stop-loss is the price where you'd exit if the trade goes against you. This drives your risk-per-share and the recommended position size below.
Most experienced traders risk somewhere between 0.5% and 2% of total account value on any single trade, which keeps a losing streak from doing serious damage to the account.
Enter the total cost of entering and exiting, combined. Leave blank or at 0 if your broker charges no commission on this trade.
Your trade breakdown
Fill in your trade details and press calculate to see the full picture.
What makes a day trade calculator actually useful
Most traders don't lose money because they picked the wrong stock. They lose money because they never nailed down the numbers before hitting the buy button: how much they stood to lose if the trade went wrong, how that compared to what they stood to gain, and whether the position size even made sense against the size of the account. This day trade calculator was built around that exact gap. Instead of just multiplying price by shares, it walks through profit and loss, risk-to-reward, and position sizing together, the way a disciplined trading plan actually works.
How the calculation works
Why position sizing matters more than most people think
Two traders can take the exact same setup, at the exact same entry and stop-loss, and end up with completely different outcomes purely because of position size. Someone risking 5% of their account on a single trade can be wiped out by a short losing streak that barely dents someone risking 1%. Professional risk management generally keeps individual trade risk to a small, consistent slice of total capital, which is precisely why this calculator surfaces a recommended maximum share count instead of just accepting whatever number you typed into the shares field.
Reading your result breakdown
Once calculated, you'll see your net profit or loss front and center, color coded so a glance tells you whether the trade was a win or a loss. Below that, a set of quick stats covers your per-share risk and reward, your percentage return on the capital committed, and your breakeven price once commission is factored in. The ratio bar gives a visual read on risk versus reward, and the sizing section shows the maximum position your own account and risk percentage would actually support for this setup.
A quick worked example
Say you're planning to buy at 52.30 with a stop at 51.80 and a target near 53.80. Your risk per share is 0.50, and your reward per share is 1.50, giving a 3 to 1 reward to risk ratio before any position sizing decision is even made. If your account sits at 10,000 and you're risking 1% per trade, that's a maximum loss of 100, which divided by the 0.50 risk per share caps this particular trade at roughly 200 shares, regardless of how much buying power your broker might otherwise allow.
A note on rules that vary by country and broker
In the United States, FINRA's pattern day trader rule generally requires a minimum equity of 25,000 in a margin account for anyone who executes four or more day trades within five business days in that account. Traders operating with smaller accounts, or under a cash account instead of margin, face different constraints on how many day trades they can place. Outside the US, there's no single universal equivalent; the UK, EU, and most other major markets regulate leverage, margin, and broker conduct differently, and pattern day trading restrictions specific to the US often simply don't apply. Because rules vary this much by jurisdiction and broker, always check your own broker's current policy rather than assuming one country's rule applies everywhere.
Frequently asked questions
How do I calculate profit or loss on a day trade?
Subtract your entry price from your exit price for a long trade, or entry minus exit for a short trade, then multiply by the number of shares or units traded. Subtracting any commission or fees gives your final net profit or loss.
What is a good risk to reward ratio for day trading?
Many traders aim for at least a 2 to 1 or 3 to 1 reward to risk ratio, meaning the potential gain is two or three times the potential loss. A favorable ratio means a trading strategy can still be profitable even with a win rate below 50%.
How much should I risk on a single day trade?
Many experienced traders limit risk on any single trade to somewhere between 0.5% and 2% of total account value, which helps prevent a short losing streak from causing serious damage to the account.
What is the pattern day trader rule?
In the United States, FINRA's pattern day trader rule generally requires a minimum of 25,000 in equity in a margin account for traders who place four or more day trades within five business days. This rule is specific to US-regulated brokerages and margin accounts, and does not universally apply outside the US.
How is position size calculated based on risk?
Multiply your account size by your chosen risk percentage to get your maximum dollar risk for the trade. Divide that number by your risk per share, the distance between your entry price and your stop-loss, to get the maximum number of shares that keeps you within your own risk limit.
Does this calculator account for trading fees and commissions?
Yes. Entering a round-trip commission amount adjusts your net profit or loss and your breakeven price accordingly, since even small per-trade fees can add up meaningfully across frequent day trading activity.
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A few connected tools cover related questions this one doesn't get into.
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This tool is provided for educational and planning purposes only and does not constitute financial, investment, or tax advice. Trading involves substantial risk of loss, and past setups or ratios do not guarantee future results. Always confirm your broker's specific rules, margin requirements, and fee structure before placing a trade.