MT5 Sharpe ratio: what it measures and why it varies

The Sharpe ratio divides average return by variability. Here is how to read it, why tools disagree and what to use beside it.

Some MT5 reports include a Sharpe ratio, and traders often wonder what to make of it. The idea behind it is old and simple: reward divided by variability. A trader who earns steadily is judged better than one who earns the same amount in violent swings. This page explains the Sharpe ratio in plain language, shows a small worked example, and is honest about why the number printed by one tool should not be compared with the number printed by another.

The idea in one sentence

The Sharpe ratio is the average return per period divided by the standard deviation of those returns. The numerator says how much you earn on average. The denominator says how bumpy the ride is. A higher ratio means more return for each unit of bumpiness.

In its textbook form, a risk-free rate is subtracted from the average return first. In many quick calculations, including simple ones in trading tools, the risk-free rate is taken as zero or ignored. Which choice your tool makes changes the number, which is the first reason to be careful.

Where to find it in MT5

MetaTrader 5 shows a Sharpe ratio in its strategy tester results and in some trade reports. Open the Toolbox, go to the History tab, choose a period, right-click and look for the report options. Menu names vary by build and broker, so check your own terminal. If the line is missing from your report type, it is simply not part of that report. For a tour of the other lines, see the MT5 report analyzer page and MT5 trading statistics.

A worked example (hypothetical)

Take eight made-up trade results: +120, -60, +80, -45, +150, -70, +40, -30. The total is +185.

The 0.27 is per trade. It is not an annual figure. Many published Sharpe ratios are annualised, which multiplies the value by a factor based on how many periods fit in a year, so a per-trade 0.27 and an annualised 1.5 are not comparable. This is the second reason to be careful.

Using the whole-set standard deviation instead of the sample version would give about 0.29, a small difference here and a bigger one with few trades. That is a third reason: even the choice of divisor changes the answer.

Why numbers from different tools do not match

• Different return series. One tool uses per-trade results, another uses daily balance changes, another uses monthly returns.
• Different treatment of the risk-free rate. Some subtract it, some use zero.
• Annualised or not. A per-period ratio and an annual ratio differ by a scaling factor.
• Different handling of costs and open positions.
• Different sample versus population standard deviation.

For all these reasons, the sensible use is internal consistency. Compare this month's ratio from your MT5 report with last month's ratio from the same report type, not with a figure someone posted from a different tool.

How to read it, carefully

• A positive value means the average result was above zero. A negative value means it was below.
• A higher value, compared on the same basis, means returns were steadier for their size.
• A short or tiny sample makes the ratio unreliable. Eight trades, as above, prove nothing.
• Strategies with rare big losses can show a flattering ratio for a long time, because the standard deviation understates tail risk. The ratio treats upside swings and downside swings the same, even though you care more about the downside.

For a view that focuses on the downside, look at drawdown and the recovery factor instead. They answer a more direct question: how bad did it get, and how fast did it recover? The MT5 recovery factor page and how to track drawdown in MT5 cover that.

Sharpe ratio compared with other numbers

No single figure is enough. A page about the full set, with worked examples, is win rate, profit factor and expectancy explained, and you can try your own numbers on the profit factor calculator.

Using it in a journal

If you want a Sharpe-like view of your own trading, compute it the same way every time. Pick a series, for example the net result of each closed trade or each day, pick the formula, and record the value with the date range in your journal. Then write what changed: a new setup, a smaller size, a different session. The point is to see whether your results are getting steadier, not to chase a headline number.

AI Trading Journal does not calculate a Sharpe ratio. It reads closed positions from MetaTrader 5 and shows net results, a P&L calendar, a growth curve and months tables, and the Excel export has live formulas, so you can add your own Sharpe-style formula on the Daily or Trades tab if you want one.

Limits of this page

• The exact way MT5 computes its Sharpe ratio, including the series and divisor, depends on the report type and build. Check your terminal's documentation and report.
• The worked example is hypothetical and tiny on purpose.
• This page explains a statistic. It is not advice, and a high ratio does not mean a strategy is safe.

Frequently asked questions

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