Best MT5 Position Size Calculator Tools: A Complete Guide for 2026

The 3:47 PM mistake. You’ve got a solid trading setup, your analysis checks out, and you’re ready to enter. You open the MT5 order window, stare at the “Volume” field, and guess. A few hours later, you realize you oversized the trade. The position size calculator you meant to use is still sitting in an open browser tab, untouched because switching back and forth felt like too much friction.

Position sizing isn’t the exciting part of trading, but it’s the part that keeps you in the game. Yet for a platform as sophisticated as MetaTrader 5, it still doesn’t include a built-in risk-based position size calculator . The “Volume” field in the order window gives you lots, but it doesn’t tell you how many lots to use based on how much you’re willing to risk. The result? Traders end up guessing, overleveraging, or manually calculating everything in a separate app—which often means not calculating at all when the pressure is on.

Let’s walk through the best MT5 position size calculator tools available right now, and more importantly, how to stop letting friction get in the way of proper risk management.

Why MT5 Doesn’t Solve This Problem (and Why That’s Annoying)

If you’ve ever felt like the platform is working against you on this, you’re not alone. MT5 provides the data you need—tick size, tick value, margin requirements—but it’s buried in contract specifications. The platform shows you the volume field but doesn’t factor in your account risk. You’re left to do the math manually or use an external tool. Neither option is efficient when the market is moving .

The Best MT5 Position Size Calculators: A Practical Breakdown

Here are the standout tools for getting position sizing right on MT5, each with its own strengths and trade-offs.

1. MyFXRoom Position Size Calculator EA (Best for Automated Execution)

This EA is built for traders who want to eliminate manual lot size entry entirely. You load the EA onto your chart, drag a stop-loss line to your preferred level, and the EA calculates the exact lot size based on your risk percentage and account balance. The lot size updates in real-time as you move the line. One click executes the market order with the pre-calculated lot size and stop loss attached .

Why it’s useful: It removes the step of copying a number from an external calculator into the MT5 order window. Everything happens on the chart.

What to know: It’s a paid tool and comes with additional features like an EMA trend filter that can block trades if the market is moving against the trend. The interface has a learning curve, but the core function—sizing from a visual stop-loss line—is intuitive.

2. EarnForex Position Size Indicator (Best Free Option)

The EarnForex position sizer has been around for years and is widely trusted. It’s an indicator you install on MT5 that asks for your balance, risk percentage, and stop loss in pips, then outputs the correct position size directly on the chart . It’s open-source, which matters if you’re loading custom code onto a funded account and want to verify the logic .

Why it’s useful: It’s free, lightweight, and works inside MT5. It doesn’t require switching to a browser.

What to know: It doesn’t execute trades or attach stop-losses automatically. You still manually enter the lot size into the order window. The lack of order-placement capability is the reason some traders eventually upgrade to an EA-based solution .

3. PositionSizeCalculator.co.uk (Best External Web Tool)

This browser-based calculator is broker-neutral, works for forex, indices, gold, and crypto, and doesn’t require any MT5 installation. You set your account size, risk percentage, and stop distance, and it gives you the lot size instantly .

Why it’s useful: It’s simple, clean, and works with any broker. If you trade across multiple platforms, you can use one tool.

What to know: It’s not integrated into MT5. You still need to switch windows, copy the lot size, and paste it into MT5. This creates friction, and friction creates mistakes.

The Problem All These Tools Share

Every tool listed above solves the calculation problem. But they don’t solve the friction problem. If you have to open a browser, load a calculator, copy the number, and switch back to MT5, you’re creating a gap between knowing your risk and placing the trade. In that gap, the market moves, you second-guess the calculation, or you skip it entirely and enter anyway.

This is where the workflow breaks down. You’re constantly switching between tools, and your attention is split. You’re not just managing a trade—you’re managing windows.

Where Camovia Tray Fits In: Not a Calculator, But a Context Keeper

Camovia Tray doesn’t calculate position size. It solves a different part of the trading workflow: keeping your market and position data accessible without window switching.

If you trade on MT5, you know the experience of keeping the platform open just to check a price or see how a position is doing. The terminal takes up screen space, and if you minimize it, you lose visibility. Camovia Tray turns MT5 into a system tray tool. You hover over the tray icon to see live quotes for your selected instruments, and you can view your open positions—symbol, direction, lot size, open price, and current profit/loss—from a floating window [product_knowledge].

What this means in practice: After you’ve calculated your position size using any of the tools above and entered the trade, you don’t need to keep the full MT5 terminal open just to monitor that trade. You can close MT5 to the tray and keep an eye on your floating P&L from a compact interface. The quote and position data stay local, read directly from the terminal on your machine [product_knowledge].

This doesn’t replace your position size calculator. It removes the friction of window management after the trade is placed. Instead of having MT5 minimized and repeatedly restoring it to check your floating profit, you can see what you need from the tray.

The other use case is pre-trade. If you’re using an external web calculator and need to check the current price of your instrument to determine your stop-loss distance, you can hover the Camovia Tray icon to see the live bid/ask without restoring MT5 [product_knowledge]. You keep your calculator open on one screen, check the price from the tray, do the calculation, and enter. It’s a small reduction in friction, but it adds up.

The Takeaway: Pick Your Calculator, But Fix Your Workflow

The best position size calculator is the one you actually use. If you want a visual, chart-based tool that executes the order, MyFXRoom or a trade manager EA is worth the investment. If you want a free, reliable in-platform indicator, EarnForex delivers. If you prefer a browser-based, multi-asset calculator, PositionSizeCalculator.co.uk is solid.

But don’t overlook the rest of your workflow. The calculation is only one step. Monitoring your positions after entry, checking current prices without restoring MT5, and managing your open trades from a single place are what turn good risk management into consistent execution. Tools like Camovia Tray can help bridge that gap—not by replacing the calculator, but by making the rest of the process less distracting.