Trade journal · plain language
What is a trading journal
A trading journal is a record you keep of trades after they are finished. It holds what you bought or sold, at what price, in what size, and what the result was. It is a logbook, not a plan and not a signal.
The point of keeping one is that memory is unreliable in a specific direction. Traders remember the wins in more detail than the losses, and they remember the reasons they had at the time as better than they were. A journal is the version of events that does not change.
It is a post-trade record, not a plan
A journal entry is written after the position is closed. It describes what happened, not what you intend to happen. A trade plan is written before you open; a journal is written after you close. They are different documents and they answer different questions.
The reason this matters is that a journal is only useful if it is honest, and the only way to be honest is to write down the result before you have a story about it. Once you have explained a loss to yourself, the explanation is what you remember.
What actually goes in an entry
At minimum: the ticker, the date, whether you were long or short, the entry price, the exit price, the size, the fees, and the profit or loss. That is the arithmetic layer, and without it nothing else can be checked.
On top of that: the setup you thought you were trading, the reason you exited, and one line on what you would do differently. The setup name matters because it lets you group trades later. The exit reason matters because most trades are decided at the exit, not the entry.
R is the number that makes trades comparable
Dollar profit tells you what happened to your account. R tells you whether the trade was a good decision. R is the profit or loss divided by what you risked when you opened, so a trade that risked $100 and made $250 is +2.5R, and one that risked $100 and lost $100 is -1R.
R is what lets you compare a $40 trade and a $400 trade on the same scale. It also exposes the pattern most traders never see: a handful of large winners carrying a long list of small losses, or the reverse.
What a journal reveals, and what it does not
It reveals your actual win rate, your average win against your average loss, which setups lose money, which days of the week you trade worst, and whether your exits are consistently early. None of those are visible from memory.
It does not make money on its own. A journal is a measurement. What you do with the measurement is a separate decision, and the journal will just as often show you that a setup you liked does not work.
A filled-in sample trade
| Ticker and date | AAPL, March 14 |
|---|---|
| Direction | Long, one call contract |
| Entry | $3.20 premium, $320 total |
| Exit | $4.85 premium, $485 total |
| Size | 1 contract, 100 shares |
| Fees | $1.30 in, $1.30 out, $2.60 total |
| Gross P&L | +$165.00 |
| Net P&L | +$162.40 |
| Risk at entry | $320 plus $2.60 fees, $322.60 |
| R multiple | +0.50R |
| Setup | Breakout above prior day high |
| Exit reason | Sold into strength before the close |
The arithmetic: 485 minus 320 is 165 gross, minus 2.60 fees is 162.40 net. Divide 162.40 by the 322.60 risked and the trade is +0.50R. A winner that returned half of what was risked is a small edge, and the journal is what makes that visible.
Run the numbers in the position size calculator, free and with no sign-up.
Where this goes wrong
Only recording the winners
A journal of wins tells you nothing about your edge, because the losses are where the information is. The trades you least want to write down are the ones worth the most later.
Recording dollars but not R
Dollar amounts scale with account size and position size, so they cannot be compared across trades. R normalises every trade to the same unit and makes the pattern readable.
Writing the entry but never reviewing it
A journal that is never read is a diary. The value comes from grouping twenty or thirty entries and looking for what repeats, which takes an hour and is uncomfortable.
Common questions
What is a trading journal in one sentence?
It is a written record of your closed trades, holding the prices, size, fees, result, and the reason you took and exited each one.
Do I need software or is a spreadsheet enough?
A spreadsheet is enough to start, and it is better than nothing. The columns that matter are ticker, date, entry, exit, size, fees, net P&L, R, setup, and exit reason.
How many trades before a journal is useful?
Around twenty to thirty closed trades is where patterns start to show. Below that, one large winner or loser distorts every average you calculate.
Does keeping a journal improve results?
It does not change any individual trade. It shows you which setups lose money and where your exits are consistently early, and what you do with that is up to you.
Write the trade down before you forget why
Reading about options is the easy half. Knowing which of your setups actually pays takes a record of what you did and what happened. TickerReplay rebuilds every trade from your broker's fills, keeps spreads, rolls, and assignments whole, and turns them into win rate, expectancy, and R.
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This is education, not advice, and nothing here predicts an outcome. Options carry risk of total loss on the premium paid and larger losses when sold. SES Technology Ventures LLC.