Lot Size Calculator

Why Position Size Is the Decision That Matters

Most traders spend their time on entries. Entries decide whether a trade wins. Position size decides whether a losing streak ends your account.

Two people can take identical signals for a year and finish with completely different results, purely because one risked one percent per trade and the other risked ten. The analysis was the same. The arithmetic was not.

The Correct Order of Operations

1. Decide the risk percentage. One percent of account equity is a common starting point. Two percent is aggressive. Five percent is how accounts end.
2. Convert it to cash. One percent of a 5,000 dollar account is 50 dollars.
3. Measure the stop distance. From your intended entry to the level where the idea is wrong, in pips. This comes from the chart, not from what feels comfortable.
4. Divide. Risk in cash, divided by stop distance in pips, gives the pip value you need.
5. Convert to lots. That pip value determines the position size.

The stop comes before the size, always. Choosing a lot size first and then placing the stop wherever the margin allows is the single most common cause of oversized positions.

A Worked Example

Account 10,000 dollars. Risk one percent, so 100 dollars. Trade EURUSD with a 40 pip stop.

One hundred divided by 40 gives 2.50 dollars per pip. At roughly 10 dollars per pip on a standard lot, that is 0.25 lots, or two and a half mini lots.

Now widen the stop to 80 pips because the setup requires it. Same 100 dollars of risk, so 1.25 dollars per pip, meaning 0.125 lots. The position halves. The risk did not change, and that is exactly how it should work.

Why a Wider Stop Is Not More Risk

This trips up almost everyone at first. A wider stop feels riskier, so traders tighten stops to feel safer and end up stopped out by ordinary noise on trades that would have worked.

Risk is stop distance multiplied by position size. Widen one and shrink the other and total risk is unchanged. The stop belongs where the trade idea is invalidated. The position size adjusts around it.

Volatile Instruments Need Smaller Positions

Gold routinely moves twenty to thirty dollars in a session, which is thousands of pips. Crude oil and crypto move further still. Applying a EURUSD position size to any of them produces losses several times larger than intended.

The method does not change, only the inputs. A wider stop mechanically produces a smaller position, which is the correct outcome. Our pip value calculator handles the per pip figure for non standard instruments.

Leverage Is Not Part of This

Leverage sets the maximum position your margin allows. It is not an input to how large your position should be. Size from risk, then check the result fits within your available margin. If it does not, the position is too big and more leverage is not the answer. Our guide on high leverage brokers covers why.