Forex position size calculator

Decide two things before you trade: where your stop-loss goes and the most you are willing to lose. Those two numbers set the largest position you can take. This calculator does the math. Nothing you enter is sent anywhere.

This tool does not tell you what or when to trade. Where you place your stop is your decision. Leveraged forex trading can lose more than you deposit. Read your broker's risk disclosure before trading.

Your account and risk per trade Account balance (in your account currency)

How to set your risk

Risk per trade (% of balance)

The trade

Pair type (pip size)

Direction

Value of 1 unit of the quote currency (right side of the pair) in your account currency

Examples: EUR/USD with a USD account → leave empty (1). USD/JPY with a USD account → type 1/150.25 (one yen in dollars). EUR/USD with a GBP account → the GBP value of 1 USD, e.g. 0.75.

Entry price

Stop-loss price

Take-profit price (optional)

Spread in pips (optional)

Smallest order size

One lot is

Your leverage (for the margin estimate)

Order sizes, lot sizes and leverage limits depend on your broker and country. Use your broker's figures.

Result

Largest position you can take

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How it works: loss per unit = stop distance (incl. spread) × pip size × conversion rate. Largest position = amount at risk ÷ loss per unit, rounded down to your smallest order size. Margin is an estimate at the leverage you chose.

Before you enter (keep your stop)

I chose my stop-loss price before placing the order
I will place the stop order at the same time as the trade
I am OK losing the "loss if the stop is hit" amount above
I won't move my stop further away if the trade goes against me
I won't size up to win back a loss

Checkmarks are not saved. Use the list before every trade.

Example

Say your balance is $10,000 and you risk 1% per trade ($100). You buy EUR/USD at 1.0850 with a stop at 1.0825 — a 25-pip stop. With a USD account each pip is worth $0.0001 per unit, so the stop costs $0.0025 per unit. $100 ÷ $0.0025 = 40,000 units (0.4 lots), and the loss if the stop is hit is $100.

Widen the stop and the same $100 buys a smaller position. The idea is to let the stop and your risk decide the size — not to pick a size first and think about the stop later.

Also free: Profit margin & job cost calculator · 日本語版（損切り・ロット計算）

Built with the help of AI; the calculations are covered by tests. Results are estimates. In fast markets (gaps, slippage) your actual loss can be larger than the stop price suggests.