Tool · Risk control
Position size calculator
Decide first how much of your account this one trade may lose, then use the gap between entry and stop to work back to how big the position should be. Position size is a result you calculate, not a number you guess.
Enter your numbers
Change any field and the results on the right update instantly. Try it with your real account numbers.
Suggested position size
The position size worked back from your per-trade risk and stop distance.
Pure math: suggested size = max loss ÷ (stop distance %). The closer the stop, the more the same loss budget can buy. This is a risk-control estimate; it ignores fees and slippage and is not investment advice — it just does the arithmetic for you.
How these numbers are worked out
It's one chain, no black box:
- Stop distance % = |entry − stop| ÷ entry × 100. The percentage each unit loses if the stop is hit.
- Max loss this trade = account × risk %. The worst-case loss you accept up front for this trade.
- Suggested size = max loss ÷ (stop distance % ÷ 100). The closer the stop, the less each unit loses, so the same loss budget buys more — counterintuitive, but it clicks once you see it.
- Share of account % = suggested size ÷ account × 100. If this goes above 100%, your capital can't cover the position at this stop and risk; lower the risk or widen the stop.
One line to remember
Position size isn't decided by your confidence — it's decided jointly by your stop distance and your per-trade risk. Answer two questions before you order — how much can this lose, and where's the stop — and the size is locked into a sane range.
Honestly
This calculator only does arithmetic. It doesn't go online, doesn't pull prices, and doesn't store any of your inputs. It manages your risk exposure "when you're right about direction," and it assumes you'll actually exit at the stop; if you don't honour the stop, the cleanest math is worthless. It predicts no prices, guarantees no profit, and is not investment advice. Whether you trade, and how much, is your call and your responsibility.
Set your risk first, then open an account
Once size and stop are clear, you still need an account with good liquidity that lets you place limit and stop orders — otherwise the stop you calculated won't hold. Signing up with a referral code gets a fee discount, and over time the saved fees are themselves a layer of cushion.