Position Size
The Position Size calculator helps you answer one of the most important questions before you place a trade: how big should this position be? Instead of guessing your lot size, you tell the tool what you have and what you're willing to risk, and it works out a suggested size for you. It opens as a quick pop-out panel from your trading sidebar, so you can run a calculation without leaving the page you're on.
The Position Size calculator is available to everyone — it works the same on every program and tier, with no upgrade needed. Look for the Position Size button (a calculator icon) in your trading sidebar, click it, fill in your details, and press Calculate. Press Calculate Again to reset and run another scenario.
What it does
Position sizing is the step between deciding what to trade and actually placing the order. The calculator takes your account balance, the percentage you want to risk, and how far away your stop loss sits, then returns a suggested lot size for the instrument you chose. The goal is simple: keep the money you could lose on the trade in line with the amount you actually intended to risk, rather than letting the position size be an afterthought.
What you enter
The panel asks for four things:
From your balance and risk percentage, the tool first works out the dollar amount you're risking, then combines that with your stop distance and the instrument to produce the suggested size.
What it returns
Once you calculate, the panel shows a results view with:
- Lot size — the headline figure: the suggested position size in standard lots.
- Risk amount — the dollar amount this trade puts at risk (your balance times your risk percentage).
- Pip value per lot — what one pip is worth per lot for the chosen instrument.
- Stop loss — your stop distance in pips, echoed back so you can confirm it.
- Live rate — for instruments that need a currency conversion, the exchange rate used in the calculation is shown so you can see what the figures are based on.
If anything about the calculation needs a caveat, the panel may also display a short note alongside the results.
Why position sizing matters
Risk management is what keeps you in the game over the long run, and position sizing is one of its most practical levers. By deciding your risk before you size the trade, you make sure a single losing position can only cost you what you planned for, no matter how large the price move or how wide your stop. It turns "how many lots feels right?" into a repeatable, deliberate decision. Treat the suggested size as a starting point for your own plan, not a recommendation about what or when to trade.