Position size calculator
Your lot size from your risk and your stop distance, in your account currency. Free, no sign-up.
How the calculation works
It all starts with the amount you accept to lose if the stop is hit: a percentage of your balance, often 0.5 to 1%, or a fixed amount.
The stop distance, in pips, tells how many pips separate your entry from your exit if the trade fails. For one lot, each pip is worth an amount that depends on the pair and on your account currency: the pip value.
The size follows directly: risk, divided by the stop distance multiplied by the pip value. The calculator handles the currency conversion for you, at today's rate.
Size (lots) = risk ÷ (stop distance in pips × pip value for 1 lot)
An example
A $10,000 account, 1% risk, so $100. Buying EURUSD with a 25-pip stop. On EURUSD, one pip is worth $10 for a standard lot. Size: 100 ÷ (25 × 10) = 0.40 lots. If the stop is hit, the loss is $100, whatever the move.
Pip value by pair
A pip is the fourth decimal of a pair, 0.0001, and the second for yen pairs, 0.01. For gold, 0.1 is the usual convention.
For a standard lot of 100,000 units, one pip is worth 10 units of the quote currency, the second one in the pair: $10 on EURUSD, £10 on EURGBP, ¥1,000 on USDJPY. It then has to be converted into your account currency, which the calculator does.
Brokers sometimes differ on contract sizes, especially for metals and indices: the contract settings remain editable.
Frequently asked questions
How much should I risk per trade?
There is no universal number, but most traders stay between 0.25 and 1% of their capital per trade, and less on a funded account with strict drawdown rules. What matters most is risking the same amount from one trade to the next, so your results stay comparable.
Why round the size?
Brokers accept sizes in steps, usually 0.01 lots. Round down: you will risk slightly less than planned, never more.
Does the calculation change on a euro account?
The pip value does, since it is converted into the account currency. That is why the calculator asks for your account currency, not just your balance.
What about a funded account?
The calculation is the same. Just relate your risk to the prop firm's rules, especially the maximum daily loss, rather than to the displayed balance alone.
And after the trade?
My Trading Book records your MT5 trades on its own, with your risk and your result in R, across all your accounts, funded ones included.
Discover My Trading Book →This calculator is a calculation aid, not investment advice. Leveraged trading carries a high risk of loss. Read the risk warning.