Forex Lot Size Calculator

The position size to trade, in standard lots, from your balance, your risk percentage and your stop in pips.

The Forex Lot Size Calculator returns the position size, in standard lots, that targets a chosen percentage of the account balance on a losing trade. It works from the balance, the risk percentage, the stop distance in pips, the pair, and the account currency, converting with daily closing rates captured at 5pm New York. The result prints the close in use, a dated snapshot rather than a live quote.

How To Use The Forex Lot Size Calculator

Results update as each input changes; there is nothing to press.

1. Enter your account balance, defaulting to 10,000 in the selected account currency.
2. Choose your account currency: USD, EUR, GBP, AUD, SGD, CAD, NZD, or MYR, defaulting to USD.
3. Set the risk per trade as a percentage of your balance, defaulting to 1%.
4. Enter your stop-loss distance in pips, defaulting to 25.
5. Select the pair, defaulting to EUR/USD: GBP/USD, EUR/USD, EUR/GBP, USD/JPY, GBP/JPY, EUR/JPY, USD/CAD, USD/CHF, GBP/CHF, EUR/CHF, AUD/USD, NZD/USD, AUD/JPY, or USD/SGD.

Pips are not points: a pip is 0.01 on a yen-quoted pair and 0.0001 otherwise, while a point on five-decimal, or three-decimal yen, pricing is one tenth of a pip.

How Position Size Is Calculated

The sizing sequence comes from the CompareForexBrokers calculator implementation; the site’s broader review approach is described on Our Methodology In 2026.

1. Risk budget: balance times risk percentage, divided by 100.
2. Raw lots: the budget divided by the product of the stop pips and the pip value of one standard lot.
3. Round down to 0.01-lot steps, minimum 0.01 lot.
4. Units: returned lots times 100,000, in the pair’s base currency.
5. Modelled risk: pip value at the returned size times the stop distance.

A US$10,000 USD account risking 1% with a 25-pip stop on EUR/USD has a US$100 budget. One standard lot of EUR/USD is worth US$10 per pip in a USD account, since the quote currency matches the account currency, so the denominator is 250 and the raw figure is 0.40 lots. That is 40,000 units of euros, the base currency, which is not automatically the account currency. Each pip at that size is US$4, giving the US$100 modelled stop loss.

Reading The Risk And Range Context

Standard lots are the primary result. The result sentence states the stop distance, the lots, the money at risk, and that risk as a percentage for the size actually returned. The breakdown’s risk amount is your requested budget, balance times percentage divided by 100, beside the pip value at 1.00 lot and the stop distance.

I recommend reading the actual percentage before the lot number: flooring and the 0.01-lot minimum mean a small budget or a wide stop can return a position whose modelled risk exceeds the percentage entered, so your requested budget and the reported risk can differ.

When available, a separate context bar compares your stop with the pair’s average daily range over 20 trading days. In my opinion that is a useful placement check: a stop inside the average range can be reached by ordinary daily movement. The range never enters the sizing formula.

A stop order does not guarantee an exit price, slippage can push the realised loss past the modelled figure, and commissions and other costs are excluded, so treat the result as a scenario.

Checking The Position Before Trading

I would confirm the pip value with the Forex Pip Calculator, then run the entry and stop through the Forex Profit and Loss Calculator. The Forex Margin Calculator, which also covers XAU/USD, shows the margin your position would require, and the Broker Fee Comparison Calculator checks spread and commission costs separately, since this tool does not deduct fees itself. The stop-loss guide covers stop placement, the drawdown guide shows how losses compound, and the forex calculators hub holds the wider set. My preference is to settle the stop first and let the size follow.