Forex Lot Size Calculator

How much should you risk per trade?

Most professional traders risk between 0.5% and 2% of their account per trade. The often-cited "1% rule" means that even a run of 10 consecutive losses reduces your account by less than 10%, leaving you in a strong position to recover.

Fixed-fractional sizing means risking a fixed percentage of your current balance each trade. Your position sizes grow as your account grows and shrink automatically during drawdowns, acting as a natural circuit breaker.

A higher risk percentage (3–5%) is not inherently wrong, but it demands a higher win rate and tighter strategy discipline to remain viable. Beginners are better served starting at 0.5–1% until they have at least three months of live-trade data to assess their actual edge.

There is no universally correct percentage. The right number is the largest amount you can lose repeatedly without changing your trading behaviour. The moment a loss makes you deviate from your plan, your strategy is already compromised.

What is a pip, and how is pip value calculated?

A pip (percentage in point) is the smallest standard price movement for a currency pair. For most pairs, 1 pip = 0.0001. For JPY pairs, 1 pip = 0.01, because the yen is quoted to two decimal places rather than four.

Pip value is the monetary gain or loss from a one-pip move on a given lot size. For a standard lot (100,000 units) on EUR/USD with a USD account, 1 pip = $10.00. For a mini lot (10,000 units), it is $1.00. For a micro lot (1,000 units), it is $0.10.

For pairs where USD is the base currency (e.g. USD/JPY, USD/CAD), pip value in USD changes with the exchange rate, because you are converting from the quote currency back to dollars. The calculator uses a recent approximate rate. For exact current values, use the full Risk Doctor tool.

Frequently asked questions

How do I calculate lot size in forex?

Divide your money at risk (account size × risk percentage) by the product of your stop-loss distance in pips and the pip value for one standard lot. For example: $100 risk ÷ (20 pips × $10 pip value) = 0.50 standard lots.

What is a lot in forex?

A lot is a standardised unit of trade volume. One standard lot equals 100,000 units of the base currency. One mini lot equals 10,000 units (0.10 standard lots). One micro lot equals 1,000 units (0.01 standard lots). Most retail brokers allow micro-lot trading, so you can size positions very precisely.

How much should I risk per trade?

Most professional traders risk 0.5–2% of their account per trade. The 1% rule is a practical starting point: risking 1% per trade means you can lose 10 consecutive trades and still have over 90% of your capital intact. Higher risk percentages require a demonstrably profitable strategy to remain sustainable.

What is a good risk percentage for trading?

For new traders, 0.5–1% per trade is appropriate while you build and verify your edge. Experienced traders with a documented track record might risk up to 2%. Anything above 2% requires strong justification from your data. The right percentage is the one you can lose repeatedly without altering your trading behaviour.

How is pip value calculated?

For pairs quoted in USD (EUR/USD, GBP/USD, AUD/USD, NZD/USD), pip value per standard lot is a fixed $10.00. For pairs where USD is the base (USD/JPY, USD/CAD, USD/CHF), pip value = (pip size ÷ current exchange rate) × 100,000. For gold (XAU/USD) at a pip size of $0.10 and contract size of 100 oz, pip value is $10.00 per standard lot.

What is the difference between a lot size calculator and a position size calculator?

They are the same tool described differently. Lot size calculator and position size calculator both refer to a tool that computes how many units (expressed in lots) to trade based on your account size, risk tolerance and stop-loss distance. Lot size is the forex-specific term; position sizing is the broader trading term used across equities, futures and crypto as well.