What is the difference between position size and notional value?

Position size in units is how much of the asset you buy. Notional value is the total dollar value of that position. Your risk is fixed by your stop loss, but the notional value can be much larger, which is why the two numbers are shown separately.

What reward-to-risk ratio should I aim for?

Most disciplined traders target at least 2:1, meaning the potential profit is twice the potential loss. With a 2:1 ratio you can be wrong more than half the time and still profit over many trades.

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S complexity

Position Size & Risk Calculator.

Enter your account size, risk percentage, entry, and stop to instantly calculate the exact position size in units and USD notional, plus your reward-to-risk ratio. Shows the number beginners misunderstand most: how much you actually buy vs how much you actually risk.

Free Runs in your browser Data: None (client-side math)

Runs entirely in your browser. Nothing is uploaded or stored.

Your trade

Direction

Account size ($)

Risk per trade (%)

Entry price ($)

Stop loss ($)

Take profit ($)

Asset ticker

Position size

$3,250 notional

0.05

BTC

Worth $3,250 at entry. This is your notional position, not your risk.

Max loss

$100

-1.00% of account

Target profit

$350

3.50 : 1 reward/risk

Risk per unit

$2,000

3.08% from entry

Stop distance

3.08%

$2,000

You risk $100 if your stop hits, but your position is worth $3,250. A reward-to-risk of 3.50:1 is a disciplined setup.

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Understanding your results.

The calculator shows four numbers that work together:

Position size (units) — how many coins to buy or short. The large number is the core output.
Notional value — the total dollar value of the position. This is usually much larger than your risk because your stop loss sits closer than your target.
Max loss — exactly what you lose if the stop is hit. It equals your risk percentage of the account, by design.
Reward-to-risk — your target profit divided by your max loss. Aim for 2:1 or better.

The single most common beginner mistake is confusing the notional value with the amount at risk. A $5,000 position does not mean you are risking $5,000; with a 1% account risk on $10,000, you are only risking $100.

How to use this tool.

Enter your account size in dollars.
Choose your risk percentage (1-2% is the standard guideline).
Enter your entry price and stop loss. For a long, the stop must be below entry; for a short, above.
Optionally add a take-profit target to see your reward-to-risk ratio.
Read the position size in units and place that exact quantity on your exchange.

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Privacy & safety.

No data leaves your browser. This calculator is pure client-side arithmetic. Your account size and trade levels are never sent to a server, stored, or shared.

Position sizing follows the standard fixed-fractional risk model used in professional trading. Verify the final numbers on your exchange before placing any order.

Frequently asked questions.

How is position size calculated?

Position size is your account balance multiplied by your risk percentage, divided by the distance between your entry price and stop loss. For example, a $10,000 account risking 1% ($100) with a $2,000 per-unit stop distance gives a 0.05 unit position. The formula is: Position Size = (Account × Risk%) ÷ (Entry − Stop).

Why do I see both units and a USD "notional" amount?

The unit count (e.g. 0.05 BTC) is how much you actually buy. The notional amount ($3,250) is the total value of that position. This distinction matters because your RISK is fixed at your chosen percentage of the account, but the position VALUE can be much larger, especially with leverage or a tight stop.

What is a good reward-to-risk ratio?

Most disciplined traders aim for at least 2:1, meaning your target profit is at least twice your maximum loss. With a 2:1 ratio you can be wrong more than half the time and still be profitable. Some scalpers accept 1:1 with a high win rate; swing traders often target 3:1 or higher.

How much of my account should I risk per trade?

The widely cited guideline is 1-2% of your account per trade. At 1% risk you can lose 20 trades in a row and still have over 80% of your capital. Risking 5% or more per trade dramatically increases the chance of a ruinous drawdown. The calculator lets you test any percentage so you can see the dollar amounts before you commit.

Does leverage change how much I risk?

No. Your risk is determined by your account size, your risk percentage, and your stop loss, not by leverage. Leverage only affects how much margin (collateral) you need to open the position and how close your liquidation price is. Higher leverage means a smaller move against you triggers liquidation, so it is riskier, but it does not change the position-size math itself.

Is this position size calculator financial advice?

No. This tool performs standard position-sizing arithmetic for education only. Always verify the numbers with your exchange before placing a trade, and never risk money you cannot afford to lose.

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