Limit Orders, Stop Orders and How to Calculate Lot Size: The Execution Basics Most Traders Get Wrong

Quick answer: To calculate lot size, multiply your account balance by your risk percentage to get dollar risk, then divide by your stop distance in pips times the pip value per lot. Always round down. Use limit orders to enter at a better price and stop orders to enter on momentum.

You can have perfect analysis and still lose money on execution. The wrong order type fills you at a price you didn't plan for. The wrong lot size turns a $5 risk into a $40 loss. Platforms don't help: one shows position size in lots, another in units, and the same trade looks completely different on each.

This article covers order types and how to calculate lot size, so the trade you place always matches the trade you planned.

Which order types should you use?

Use a market order for immediate entry, a limit order to enter at a better price, and a stop order to enter on momentum.

Market orders

A market order enters immediately at the best available price. It's the fastest way into a trade, but you accept whatever price you get. In fast markets or around news, that price can be noticeably worse than the one you saw on screen. This difference is called slippage.

Limit orders: enter at a better price

A limit order enters at a price better than the current one.

• Buy limit: placed below the current price. If gold is trading at 1950 and you want to buy at 1949, you place a buy limit at 1949. If price drops to that level, your broker fills you automatically.

• Sell limit: placed above the current price. You're selling higher than where price is now.

Limit orders suit traders who enter at. You set the order at your zone and let price come to you.

Stop orders: enter on momentum

A stop order enters at a price worse than the current one, in the direction of the move.

• Buy stop: placed above the current price. You only buy if price breaks higher.

• Sell stop: placed below the current price. You only sell if price breaks lower.

Stop orders suit, where you want confirmation that price is moving before you commit.

Lots vs. units: what's the difference?

In forex, position size is measured in lots, but some platforms show the same size in units.

That's why a trade that reads 0.01 on one platform reads 1,000 on another. Before you place a trade on any platform, check which one it uses. EdgeFlo's guide to covers each size in more detail.

What are pips, ticks and pip value?

A pip is the standard unit of price movement in a currency pair. On EUR/USD, a pip is the fourth decimal place (0.0001). A tick is the smallest price movement the platform allows, which may be a fraction of a pip. Pip value or tick value is how much money that movement is worth at your position size.

For EUR/USD, one pip is worth about $10 on a standard lot, $1 on a mini lot and $0.10 on a micro lot (for a USD-denominated account). Other instruments have different values, which is why sizing needs a calculation every time. See for more examples.

How to calculate lot size step by step

Size your position from risk, never from a lot size you feel comfortable with. Deciding your comes first.

• Dollar risk = account balance × risk %.

• Position size = dollar risk ÷ (stop distance in pips × pip value per lot).

• Round down to the nearest size your platform allows.

• Worked example: You have a $1,000 account and risk 0.5%. Your dollar risk is $5. Your stop is 20 pips on EUR/USD. With a pip value of $0.10 per micro lot, each micro lot risks $2 over 20 pips. $5 ÷ $2 = 2.5 micro lots, so you round down to 0.02 lots.

Always round down. Rounding up means risking more than you planned.

How does lot sizing differ across asset classes?

Each market measures size differently, so never reuse one lot size across markets. Forex, gold and indices use lots. Crypto uses quantity. Stocks use shares.

Pip and tick values also vary by instrument and by broker contract size, so a lot size that risks $5 on EUR/USD may risk something very different on gold or NAS100. EdgeFlo's guide to shows the differences.

Practice on a demo first

Run your sizing process on a demo account before trading live. Place trades, check the dollar risk on each one and confirm it matches your plan. Once the numbers line up every time, you're ready to.

Common execution mistakes

• Using a market order around news and getting filled far from your planned price.

• Confusing lots and units when switching platforms.

• Rounding position size up instead of down.

• Reusing a forex lot size on gold, indices or crypto.

How EdgeFlo takes the maths off your plate

Manual sizing is where small errors become big losses, especially when you're rushing to catch an entry. EdgeFlo's works out your position size automatically from your account size, risk percentage and stop distance. It adapts the size field to the asset you're trading: lots, quantity or shares.

If an order is larger than your broker's lot limit, EdgeFlo splits it for you. Connect a demo or live account through cTrader or TradeLocker, and practice with the same sizing process you'll use live. The show how to connect an account.

Key takeaways

• Limit orders enter at a better price; stop orders enter on momentum.

• Know whether your platform uses lots or units before you size a trade.

• Calculate lot size from risk %: dollar risk ÷ (stop pips × pip value per lot).

• Always round down.

• Each asset class sizes differently.

Final thoughts

Execution errors are the most avoidable losses in trading. Learn your order types, know how to calculate lot size from risk, automate what you can and keep your attention on the decisions that need it.

Want sizing done for you on every trade?.

Risk warning: Trading forex, gold, indices, cryptocurrencies, stocks and CFDs involves significant risk and may not be suitable for all investors. Leveraged products can result in losses that exceed your initial deposit. Past performance is not indicative of future results. This content is for educational purposes only and is not financial advice. EdgeFlo is not a broker.