Trade journaling · Beginner

Why Keep A Trading Journal

Memory is a highlight reel. A journal is the only record that shows what your trading actually did.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

In short

A trading journal turns your trading into a dataset you can study, which is the only reliable way to find out what your process actually does. Memory over-weights large wins and drops small losses, so recalled win rates are routinely several points off and blind to the gap between average win and average loss. Thirty honest entries is where a journal starts paying.

What to remember

Recall is weighted by emotional intensity rather than frequency, which is why remembered win rates run high.
A seven-pip gap between average win and average loss is invisible from memory and obvious in a column of numbers.
Record every result in R, multiples of the amount risked, so trades of different sizes can be averaged together.
Twenty trades is noise. A journal answers questions about your process only once it holds dozens of entries.

Step 8 of 10 on Build Your Trading Plan

PreviousRisk Management Rules At The Portfolio Level NextCalculating Win Rate Versus Risk-Reward

What a journal actually buys you

A trading journal is a written record of every trade you take together with the reasoning behind it, and its value is that it converts trading from a blur of decisions into a dataset you can study. Without one, the only record of your trading is memory, and memory is not neutral. It keeps the trades that felt significant and quietly drops the rest.

That matters because almost every decision about how to improve depends on knowing what actually happened. Which setup is carrying the account. Whether your losses are bigger than your wins. Whether the bad months share a cause. None of those questions can be answered from impression, and all of them can be answered from forty rows in a spreadsheet.

The 40-trade arithmetic memory gets wrong

Take a trader who is convinced their breakout entries are working. Forty trades in, asked from memory, they put the win rate at about 60% and describe the run as break-even to slightly up.

The log says something else. 40 trades, 22 wins and 18 losses, so a 55% win rate. Average win 34 pips, average loss 41 pips. Expectancy per trade is (0.55 x 34) minus (0.45 x 41), which is 18.7 minus 18.45, or 0.25 pips. That is before costs. At an average 1.2 pip round-trip spread, the same forty trades finish about 38 pips down.

Nothing about the impression was wild. The win rate was five points off, and the average loss was seven pips larger than the average win. Those two small errors are the whole difference between a method that works and one that pays the broker. You cannot see a seven pip asymmetry from memory. You can see it in about ten seconds in a column of numbers.

Why the highlight reel is the default

Recall is weighted by emotional intensity, not by frequency. The trade that ran 80 pips in your favour on a Friday afternoon is stored with the pair, the time and the feeling. The eleven small losses from the fortnight before are stored as a slow patch. Both are true events, and only one of them is available when you sit down to judge the strategy.

A journal also changes behaviour before the fact, not only after it. Writing entered because price held the 4H level and London had opened takes fifteen seconds, and it is uncomfortable to write when the real reason is that the pair was moving and you did not want to miss it. The requirement to state a reason is itself a filter, and it is the only part of journaling that pays you on the same day.

8 more sections in MarketPro

What a journal will not tell you

It will not settle whether a strategy has an edge from a small sample. Twenty trades is noise. A method with a genuine 55% win rate still produces plenty of twenty-trade stretches that finish negative, so a bad month proves nothing on its own, and a good month proves nothing either.

It will not tell you what to do about a finding. Knowing that your Tuesday trades are worse than your Thursday trades is not a rule, it is a candidate for one, and it needs a mechanism that makes sense plus a further stretch of trades before it earns a place in the plan.

And it cannot defend you against a dishonest entry. A log missing its worst trades is more damaging than no log at all, because it produces a number you trust and should not. The discipline that makes the log worth keeping is the same one described in the risk rules: write down what you did, not what you meant to do.

Twelve columns, starting tonight

Mechanics. Date, instrument, direction, entry, stop, target, position size, and the percentage of the account risked.
Reason. One sentence written before the entry, naming the setup and the level that triggered it.
Outcome. Exit price, result in R (multiples of the amount risked), and a yes or no on whether the plan was followed.

R is the column people leave out and the one that makes everything else comparable. A trade risking 0.8% that returns 1.6% is +2R, exactly like a trade risking 0.5% that returns 1.0%, which lets you average results across positions of different sizes without the arithmetic quietly misleading you. The position size calculator gives you the lot size for a chosen risk, and the journal records what that risk returned.

Fill it in the same day, for every trade, including the ones you would rather forget. Thirty entries is where it starts paying. A hundred is where it starts changing what you trade, because at that point the differences between your setups are larger than the noise around them.

Finish this lesson in MarketPro

The rest of Why Keep A Trading Journal, a quiz that checks it landed, and your place kept in the curriculum.

8 more sections of this lesson
All 320 lessons, with no cap and no paywall
Free on any account, including a free one

In your browserContinue on webor continue on web

Same account as the app · No install · Free to start

Or scan with your phone camera to get the MarketPro app.

Download on theApp Store Get it onGoogle Play

Free account, no card needed.

Not investment advice. Past performance is not indicative of future results.

Run the numbers while this is fresh

Work it through on your own position size. Nothing leaves your browser and there is no sign-up: Drawdown calculator, Risk of ruin calculator.

Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

FAQ

Why Keep A Trading Journal: questions

How many trades before a trading journal tells you anything?

Around 30 entries is where basic questions become answerable, such as whether your average loss is larger than your average win. A hundred entries is where you can compare setups against each other with reasonable confidence. Below about 20 trades, a run of good or bad luck moves the numbers more than your actual edge does.

What should I write in a trading journal?

The mechanics (date, instrument, direction, entry, stop, target, size and risk percentage), the reason you took the trade written before entry, and the outcome in R alongside a yes or no on whether you followed your plan. Ten to twelve fields is enough. Anything that takes longer than about ninety seconds will be skipped on the days it matters most.

Is a spreadsheet good enough for a trading journal?

Yes. One row per trade with consistent columns does everything the numeric side of journaling needs, including sorting by setup and filtering by session. Dedicated software adds chart attachment and automatic statistics, but the habit of filling it in honestly matters far more than the tool you fill in.

Trade · Learn · Earn

The whole academy is free in MarketPro

All 320 lessons, 12 guided paths, quizzes and a daily streak. Free on every account, in the app or your browser, with vetted free signals alongside it.

In your browserContinue on webor continue on web Download on theApp Store Get it onGoogle Play

Same account as the app · No install · Free to start

Not investment advice. Past performance is not indicative of future results.