Free calculators
Do the maths before the trade.
Quick answer: start with the position size calculator: enter your balance, the share you will risk and your stop-loss distance, and it returns the lot size. Then use the pip value and margin calculators to see what each pip is worth and how much margin the trade ties up.
Every calculator runs instantly in your browser, needs no sign-up, and explains what the result means for your account — not just a number.
8 tools
The calculators
Position sizing first — it is the one that decides whether a losing streak is survivable. The stop distance you enter usually comes from the chart: the point where your idea is proven wrong, often just beyond a support or resistance zone.
Which tool, when
Which calculator do you need?
The two live calculators answer different questions, and they are usually used together, in this order.
Use the Pip Calculator when you need to know what one pip is worth. Pip value depends on your trade size, on whether the pair is quoted to four decimals or is a yen pair, and on how the pair's quote currency converts into your account currency. The familiar 10 dollars per pip on a standard lot only holds when the quote currency is your account currency — EUR/USD on a USD account, for example. For anything else, the calculator walks you through the conversion. New to the term? Start with what a pip is.
Use the Position Size Calculator before every trade. You bring two decisions — how much you accept to lose (see risk per trade) and where your stop-loss belongs on the chart — plus the pip value. It returns the size in lots, rounded down to a size your platform will accept, and what that rounded size really risks. The reasoning behind it is in the position sizing lesson, and the cheat sheet keeps the formula on one page.
What these tools assume, and what they leave out. They do arithmetic on the numbers you type. They do not see your broker's live prices, spread, commission or swap, and a price gap through your stop can fill you worse than planned, so a real loss can be slightly larger than the calculated one. Your broker's own figures are the ones that settle your account — check them on your platform. Nothing here is advice on whether to take a trade.