{"id":42,"date":"2026-05-23T04:19:03","date_gmt":"2026-05-23T04:19:03","guid":{"rendered":"http:\/\/docs.traderis.me\/en\/docs\/required-margin-lot-size\/"},"modified":"2026-06-06T04:33:03","modified_gmt":"2026-06-06T04:33:03","password":"","slug":"required-margin-lot-size","status":"publish","type":"docs","link":"https:\/\/docs.traderis.me\/en\/docs\/required-margin-lot-size\/","title":{"rendered":"Required Margin and Lot Size \u2014 Understanding Margin Level and Stop-Out"},"content":{"rendered":"\n
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\ud83d\udccc Key Takeaway<\/p>\n\n\n\n

The only way to prevent stop-outs is to size lots by the 1% risk rule. A properly sized lot keeps your margin level around 1,000%, making it structurally impossible to be stopped out before your stop-loss is reached.<\/p>\n<\/div><\/div>\n\n\n\n

“I raised my lot size and got stopped out by the broker.” “I don’t really understand margin level.” If you don’t grasp the relationship between lot size and margin, you can be force-closed (stopped out) due to insufficient margin \u2014 even while following your money-management rules<\/strong>.<\/p>\n\n\n\n

This article covers how to calculate required margin, how margin level and stop-out work, and their relationship to lot size. Reading Lot Calculation Basics<\/a> and Why You Should Drop Fixed Lots<\/a> first will deepen your understanding.<\/p>\n\n\n\n

What Is Required Margin?<\/h2>\n\n\n\n

Required margin is the minimum collateral needed to hold a position of a given lot size<\/strong>. Because FX is leveraged, you hold a position by locking up a fraction of the trade value as margin \u2014 not the full amount.<\/p>\n\n\n\n

Required margin = Trade size \u00d7 Current price \u00f7 Leverage<\/strong><\/pre>\n\n\n\n
Example: USDJPY 1 lot (100,000 units)<\/h3>\n\n\n\n
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Leverage<\/th>Calculation (price 150)<\/th>Required margin<\/th><\/tr><\/thead>\n
25x<\/td>100k \u00d7 150 \u00f7 25<\/td>\u00a5600,000<\/td><\/tr>\n
100x<\/td>100k \u00d7 150 \u00f7 100<\/td>\u00a5150,000<\/td><\/tr>\n
500x<\/td>100k \u00d7 150 \u00f7 500<\/td>\u00a530,000<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n
At the same 1 lot, higher leverage means smaller required margin. Note that maximum leverage varies significantly by jurisdiction and broker<\/strong> (for example, retail leverage is capped at 25:1 in Japan, 50:1 in the US, 30:1 in the EU\/UK, while some offshore brokers offer far higher). Always confirm the cap with your own broker.<\/p>\n\n\n\n
Margin Level and Stop-Out<\/h2>\n\n\n\n
Margin level<\/strong> shows how much cushion your equity has against your open positions.<\/p>\n\n\n\n
Margin level (%) = Equity \u00f7 Used margin \u00d7 100<\/strong>\n\nEquity = Balance + Unrealized P&L<\/pre>\n\n\n\n
As unrealized losses grow, equity falls and the margin level drops. When it falls below a certain threshold, a stop-out (forced liquidation)<\/strong> triggers and your positions are automatically closed.<\/p>\n\n\n\n
The stop-out threshold varies by broker<\/strong> (e.g. some trigger at 50% margin level, others at 100%, and some offshore brokers at lower levels). Always check your broker’s rules. A stop-out is a safety mechanism to halt losses before your balance goes negative \u2014 but it locks in your loss the moment it fires<\/strong>.<\/p>\n\n\n\n
Bigger Lots \u2192 Lower Margin Level<\/h2>\n\n\n\n
A larger lot means more required margin, so for the same equity your initial margin level is lower and there’s less room before a stop-out<\/strong>. With \u00a5600,000 equity, USDJPY, 25x leverage:<\/p>\n\n\n\n
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Lot<\/th>Required margin<\/th>Margin level at entry<\/th>Loss tolerance before stop-out (approx.)<\/th><\/tr><\/thead>\n
0.1<\/td>\u00a560,000<\/td>1,000%<\/td>Very large<\/td><\/tr>\n
0.5<\/td>\u00a5300,000<\/td>200%<\/td>Moderate<\/td><\/tr>\n
0.9<\/td>\u00a5540,000<\/td>~111%<\/td>Tiny<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n
*Margin level and tolerance are approximate and vary with price and the broker’s stop-out level. At 0.9 lots the margin level is low from the moment you enter, so a small adverse move triggers a stop-out almost immediately. A lot that’s too large for the account gets stopped out before reaching your stop-loss<\/strong> \u2014 the worst-case scenario.<\/p>\n\n\n\n
Distinguish the Two “Lot Ceilings”<\/h2>\n\n\n\n
Lot size has two ceilings of different natures. Only a lot satisfying both is a “safe lot.”<\/p>\n\n\n\n