Use this free forex position size and pip value calculator for the major and minor currency pairs plus gold — size each trade to a fixed risk, with pip value handled correctly for JPY pairs and crosses.
How forex position sizing works
Risk amount = account balance × risk % ÷ 100. Position size (lots) = risk amount ÷ (stop-loss in pips × pip value per lot). Enter your pair, balance, risk, and stop, and the tool returns the right number of lots.
Why pip value is not always $10
It is a clean $10 per standard lot only when the pair is quoted in your account currency (for example EUR/USD for a USD account). For USD-base and cross pairs the value moves with the exchange rate, so the tool asks for the current rate and converts it for you. Pip size is 0.0001 for most pairs and 0.01 for JPY pairs.
A worked example
Say the account is $10,000, the risk limit is 1% per trade, and the stop-loss on a EUR/USD trade is 25 pips away from entry. The dollar risk is 1% of $10,000 = $100. On a standard lot (100,000 units) of EUR/USD, one pip is worth about $10, so 25 pips of risk on a standard lot equals $250 — already more than the $100 budget. Dividing the $100 budget by $250 per standard lot gives 0.4 lots, meaning the trade should be sized at roughly 0.4 standard lots (or 4 mini lots) to keep the actual dollar risk at the stop-loss equal to the intended 1%.
How to read the results
The calculator works backward from three inputs — account size, risk percentage, and stop-loss distance in pips — to a position size in lots. Position size is not a guess or a round number; it is the exact size that makes the dollar loss at the stop equal to the dollar risk chosen upfront. A wider stop-loss (more pips) means a smaller position size for the same dollar risk, and a tighter stop allows a larger position for that same risk. This is why position size and stop-loss placement have to be set together, never independently.
Common mistakes with forex position sizing
The most common mistake is picking a position size first — based on gut feel, or “round numbers” — and only figuring out the dollar risk afterward. That reverses the correct order: risk percentage and stop-loss distance should determine position size, not the other way around. See position sizing rules for systematic traders for the broader framework this calculator implements for one trade at a time.
The second mistake is forgetting that pip value itself varies by pair, not just by lot size. On pairs where the U.S. dollar is not the quote currency, pip value has to be converted using the current exchange rate, which is exactly why this calculator asks for a conversion rate on certain pairs instead of assuming a flat $10-per-pip figure.
The third is ignoring leverage limits and margin requirements once a calculated position size is large relative to account equity. A mathematically correct position size can still exceed what the broker’s margin allows, or leave too little free margin to survive normal price noise without a margin call — always check the position against available margin, not just against the risk-percentage math.
Frequently asked questions
What is a pip?
The standard smallest price increment — the fourth decimal for most pairs and the second decimal for JPY pairs.
Why do I have to enter a rate for some pairs?
For USD-base and cross pairs, pip value depends on the live exchange rate, so the tool needs it to convert to your account currency.
Is forex risky?
Yes. Forex is leveraged and most retail forex accounts lose money; position sizing manages but does not remove that risk.
Educational tool, not financial advice. Forex is leveraged and high-risk.
Where to invest: brokers with fractional shares
To act on what this tool shows you, you’ll need a brokerage account. These are established brokers we use that support fractional shares — buying a slice of a share by dollar amount, which makes dollar-cost averaging and diversifying with small amounts easy:
- Robinhood — commission-free investing with fractional shares from $1, and the only major broker offering a daily recurring-investment schedule. Recommended for most beginner-to-intermediate investors who want the simplest way to automate investing — see how to automate your investing for the full setup.
- Charles Schwab — fractional shares of most U.S.-listed stocks and ETFs from $1, commission-free online.
- Fidelity — “Stocks by the Slice” fractional investing from $1, with strong research and low-cost index funds.
Referral disclosure: the broker links above are referral links. If you open and fund an account through them we may receive a referral reward at no cost to you; it never affects our tools or conclusions. This is educational information, not investment advice — choose the broker that best fits your needs.