Position Size Calculator
Size the trade before you place the trade. Enter account size, risk, entry, stop loss, and optional target to calculate position size, actual risk, margin, and risk/reward in one place.
Trade Inputs
Fill in your setup details. Results update instantly.
Results
Use these numbers before the trade is entered.
Ready to Build a Better Trading Workflow?
Use the calculator to control risk first, then build the rest of your routine around cleaner charts, alerts, watchlists, and a plan that actually fits how you trade.
How to Use This Position Size Calculator
Set your account risk
Enter your account size, choose percentage risk or fixed risk, and define how much you are willing to lose on the idea.
Mark entry and invalidation
Add your planned entry price and stop loss. That distance is the core number behind position sizing.
Size the trade before entry
Review the calculated position size, actual risk, position value, margin, and optional risk/reward before the trade goes live.
The calculator works best when you already know where your trade idea is invalidated. Once that level is clear, sizing becomes much more objective and repeatable.
What This Calculator Shows You
Risk Amount
How much capital you are prepared to lose if the stop loss is hit.
Stop Distance
The price gap between entry and stop loss, including optional fees or slippage per unit.
Position Size
The number of shares, units, or contracts you can take without breaking your risk limit.
Position Value
The total notional size of the trade based on your final position size and entry price.
Required Margin
Useful when leverage is involved. This shows how much capital is tied up to hold the position.
Risk / Reward
If you add a valid target price, the tool estimates potential profit and the risk/reward ratio.
The goal is simple: risk less randomly and size trades more consistently.
Quick Risk Reference Table
Many traders think in percentages first. This quick table shows what common risk levels look like across different account sizes.
| Account Size | 0.5% Risk | 1% Risk | 2% Risk |
|---|---|---|---|
| $1,000 | $5 | $10 | $20 |
| $5,000 | $25 | $50 | $100 |
| $10,000 | $50 | $100 | $200 |
| $25,000 | $125 | $250 | $500 |
| $50,000 | $250 | $500 | $1,000 |
This table is only a reference. Your actual position size still depends on the distance between your entry and stop loss.
Position Size Formula
The basic formula is straightforward:
Position Size = Account Risk ÷ Trade Risk per Unit
Account risk is the amount you are willing to lose on one trade. Trade risk per unit is the distance between entry and stop loss, adjusted for optional costs such as fees or slippage.
Leverage changes margin usage, but it does not remove the need to size the trade around the actual distance between entry and stop.
Example Position Size Calculation
Example: if your account size is $10,000 and you risk 1% per trade, your maximum risk is $100. If your entry is $100 and your stop loss is $95, your stop distance is $5. If fees or slippage add $0.25 per unit, your total risk per unit becomes $5.25.
$100 ÷ $5.25 = 19.04 units
If you trade whole units only, you would round down to 19 units. That keeps actual risk slightly below your selected maximum rather than above it.
Position Sizing Habits That Help
Good Habits
- Define risk before the order is entered
- Use the stop loss as the anchor for size
- Round down when whole units matter
- Use leverage carefully and understand margin
- Treat sizing as part of your routine, not an afterthought
Common Mistakes
- Entering first and calculating risk afterward
- Using the same size on every setup
- Ignoring fees or slippage completely
- Oversizing because the setup looks strong
- Using stops that do not reflect the real setup
This calculator does not replace judgment, but it does make the math much faster, cleaner, and more consistent.
Position Size Calculator FAQ
What is a position size calculator?
A position size calculator helps traders determine how large a position can be while staying inside a chosen maximum risk limit.
How much should I risk per trade?
Many traders use 0.5% to 2% of account size per trade, but the right number depends on your strategy, experience, and tolerance for drawdowns.
Can I use this calculator for stocks, crypto, and forex?
Yes. It works for most price-based markets where risk is defined by the distance between entry and stop loss.
Does leverage change my real trade risk?
Leverage changes margin requirements, but your core risk is still based on position size and the distance between entry and stop.
Should I round my position size down?
Usually yes. Rounding down helps keep actual risk below your maximum instead of accidentally above it.
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Financial Disclaimer
The content on ChartWiseHub.com is provided for educational purposes only and does not constitute financial or investment advice. Trading and investing involve risk, and you should never invest money you cannot afford to lose. Always do your own research or consult with a licensed financial advisor before making financial decisions.