Forex Position Size Calculator with Costs

How position sizing works

Risk budget = equity × risk percentage. Loss per lot = entry-to-stop distance × contract size × quote-to-account conversion + round-trip commission + extra cost pips × pip value per lot. Volume is rounded down to the broker’s lot step and capped by its maximum. A result below the minimum becomes zero; the calculator never rounds it up into a larger risk.

Use executable prices

Enter the expected buy ask or sell bid and the price at which the position would close. When those prices already include the spread, leave the extra spread allowance at zero to avoid counting it twice. A gap or a worse fill can exceed this planned loss. The calculator does not check available margin.

For most FX pairs one pip is 0.0001; for JPY quote pairs it is 0.01. Fractional platform points are not whole pips. Contract size is editable because the broker’s specification controls the actual exposure.

Currency conversion

ECB rates are daily reference rates against EUR, not live trade quotes. Quote-to-account conversion equals the account currency’s ECB rate divided by the quote currency’s ECB rate. For example, with EUR as the account currency and USD quoted at 1.10 per EUR, one USD converts to approximately 0.90909 EUR. Update the conversion at the time of your calculation.

Source: ECB reference rates and publication policy. Verify the result against MT5 order profit and symbol specifications.

For metals and indices, use the tick-value position calculator.

Frequently asked questions