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Position size calculator

Enter your account size, the percentage you plan to risk and where your stop goes. The calculator shows position size, required margin and the risk to reward ratio. No sign-up, everything is calculated in your browser.

Skenuok.lt teamUpdated 2026-10-02For education only

In the same currency as the prices, usually USDT
Trading courses most often mention 1-2 %
Below entry is Long, above entry is Short
Leave empty if not needed
1 means no leverage

Example values are filled in. Replace them with your own numbers.

Direction
Long
Risk amount
10
Distance to stop, % of entry
2.5 %
Position size (units)
0.005
Position value
400
Position value, % of account
40 %
Required margin
400
Risk to reward (R:R)
1:2
Result if the target is reached
+20
Result if the stop is hit
-10

The calculator shows plain arithmetic without exchange fees, funding fees or slippage. The liquidation price is approximate (isolated margin, no maintenance margin or fees), so the real price is always closer to entry. The exchange shows it.

How position size is calculated

Position size comes from three things: how much money you are ready to lose, where the stop is and where you enter. First the risk amount is calculated, then it is divided by the distance to the stop.

  • Risk amount = account size × risk percentage ÷ 100
  • Price distance to stop = |entry price - stop price|
  • Position size (units) = risk amount ÷ price distance to stop
  • Position value = position size × entry price
  • Required margin = position value ÷ leverage

Worked example

The account holds 1,000, you risk 1 %, which is 10. Entry 80,000, stop 78,000, price distance to the stop 2,000. Position size: 10 ÷ 2,000 = 0.005 units. Position value: 0.005 × 80,000 = 400, which is 40 % of the account. If the stop is hit you lose 10. If price reached the 84,000 target, the result would be 20, an R:R of 1:2. The numbers are made up and are not a trading recommendation.

Worth knowing

  • Position value can exceed the account size. Then leverage is needed, and leverage adds liquidation risk.
  • Leverage does not change the risk amount, which is set by the stop and the position size. Leverage only changes the margin needed and the liquidation price.
  • A stop does not always fill at the exact price. More on that: slippage.

Frequently asked questions

How do I calculate position size in crypto trading?
Position size is the risk amount divided by the price distance to the stop. The risk amount is the account size multiplied by the chosen risk percentage. For example, a 1,000 account, 1 % risk (10), entry 80,000 and stop 78,000 give a 0.005 unit position worth 400.
What percentage of the account should I risk per trade?
There is no single correct number. Trading courses most often mention a 1-2 % limit, and beginners often pick 0.5-1 %. What matters most is that the limit is set in advance. The final decision is yours.
Does the calculator include fees and slippage?
No. It shows plain arithmetic without exchange fees, funding fees or slippage. In a sudden move a stop can fill at a worse price, so the real loss can be larger than the calculated one.
How does leverage work in the calculator?
Leverage does not change the risk amount, because that is set by the stop and the position size. It only changes the margin needed and the liquidation price. If the approximate liquidation price is closer to entry than the stop, the position would be liquidated before the stop is hit.
Are the numbers I enter sent to a server?
No. All calculations run in your browser, and the numbers you enter are not sent or stored anywhere.

You can practise position size and stops in the Skenuok app, with real charts.

Download on theApp StoreSee plans

Related terms and articles

Stop lossWhere to put a stop and how stop-market differs from stop-limit.LeverageHow leverage changes margin and liquidation risk.Liquidation and marginWhen a position is closed by force.Risk to reward (R:R)What R:R 1 : 2 and 1 : 3 mean.Risk management and stop lossAn article with numbers and real BTC charts.Leverage and futuresHow leverage works and why some positions get liquidated.