1. Set your risk
Enter your account balance and the percentage you are willing to lose if the trade fails — most disciplined plans risk 0.5% to 2% per trade.
Free forex tool
Forex position size calculator
Position sizing is the one decision that controls how much a losing forex trade costs you. Enter your account balance, risk percentage and stop loss below to get the exact lot size, units and risk amount for your next trade on EUR/USD, GBP/USD, USD/JPY or any pair — free, no account needed.
Risk amount
$100
Position size (units)
20,000
Position size (standard lots)
0.2
Potential reward
$200
Risk / reward
1 : 2.00
Opens your journal with entry, stop, risk % and R-multiple already filled in — sign in to save it.
Units are calculated in the quote currency of the pair (e.g. EUR/USD is priced in USD). Educational tool only — not financial advice.
How to use this calculator
2. Place the stop first
Enter the entry price and the stop loss your strategy dictates. The distance between them, not your conviction, decides the size.
3. Trade the number
The calculator gives you the exact position size in units, the money at risk and the risk/reward against your target, so the plan is set before you enter.
Why position sizing matters more than the entry
Two traders can take the same setup and get opposite results purely because of size. Risking a fixed small percentage means a losing streak costs a known, survivable amount, while oversized positions turn a normal run of losses into a blown account.
The formula is simple: risk amount = balance × risk %, and position size = risk amount ÷ stop distance. On a EUR/USD trade with a 50-pip stop, risking 1% of a $10,000 account ($100) means a position of 20,000 units — 0.2 standard lots or 2 mini lots. Because the stop distance in pips changes on every trade, the lot size must be recalculated every time — which is exactly what this tool does.
In the Trade Master Academy workspace this calculator connects to live market prices, your trading journal and your written trading plan, so the number you calculate here becomes a rule you actually follow.