Risk Marshal

Position Size Calculator

Estimate a position size from the amount you choose to risk at your stop. Enter your balance, risk budget, stop distance and broker specifications.

Position Size Calculator

Enter your broker's specifications for this instrument. Use the same pip or tick unit throughout and the same account currency for all money values.

The starting balance is hypothetical. Replace it with your own.
Use your own per-trade risk rule, up to 100%.
Entry to stop, using the same unit as your value per lot.
In account currency. Use the broker's loss-side value; do not assume 10 for every instrument.
The allowed increment, for example 0.01 or 1.
Account currency. Zero excludes costs; add expected commission and other costs per lot.

Enter all values and broker specifications to calculate.

Rounded down to the supplied lot step. This estimate uses a constant unit value and only the costs entered above. It does not check margin, validate an order or place a trade. Currency conversion, spread, slippage, gaps and changing tick values can increase the actual loss. Verify the result with your broker.

How it works

Your selected risk budget is your balance times your risk percentage. Divide it by the estimated loss per lot: stop distance times the pip or tick value, plus any costs you enter. The calculator rounds down to the supplied broker lot step and maximum. If no valid size meets the broker minimum, it shows that the budget cannot fit a position.

The hard part isn't the arithmetic — it's that the trade where you most want to override the answer is the trade where the answer matters most. A calculator tells you 0.47 lots; it can't stop you typing 2.0 after three losses.

Related reading

Put your chosen risk limit into practice. Core and Pro can attempt to reduce position sizes under your saved financial limits when your MT5 account is connected and trading access is enabled. This calculator does not update those rules or place a trade.

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