Basics · Reading your account
Reading your P&L: average cost, paper gains, realized
A lot of beginners start trading before they even understand what those numbers in their account mean. This piece clears up average cost, unrealized P&L, realized P&L, and fees all at once, so you're not led around by the numbers on screen.
Here's a scene I've watched too many times. Someone tells me, all fired up, "I'm up 30% on this," and a couple of weeks later we talk again and they've deflated, "ugh, it fell back, false alarm." The thing is, they never received a cent the whole way through. That 30% they "made" was only a number on screen, it never actually belonged to them. The problem wasn't the market, it was that they hadn't separated what those P&L numbers in the account actually mean. This piece breaks down these most basic, yet most confusing, concepts.
These are the basics of the basics, but precisely because they're so basic, many people skip them, and then get jerked around by a number they never understood at the very moments they need to stay calm. As usual, the backdrop first: crypto is extremely volatile, losing all of your capital is possible, only spare money, your own decisions, and this isn't investment advice.
Average cost: what you actually bought in at
Start from the most basic thing: your cost is the average amount you paid per unit for this thing. If you only bought once, it's simple, the cost is that trade's fill price. But the moment you buy over two or more trades at different prices, it needs a calculation, and what your account shows you then is the average cost.
The calculation isn't complicated. Remember one line: average cost = total money spent ÷ total quantity bought. Note, it's not the "average" of simply adding the prices and dividing by the number of trades. It's weighted by amount, so whichever trade you bought more in has the bigger effect on the final average cost. Beginners get this wrong easily.
Term Average cost: the total money you paid for all the quantity you hold, divided by the total quantity. It's "amount-weighted," not a "simple average of prices," so a large buy sways this number more than a small one.
Why bother understanding this number? Because it's the baseline you judge whether you're up or down against. Price above it, you're up on paper; below it, down on paper. If you can't even say what you actually bought in at, then the most basic question, "am I up or down right now," you're answering by feel. Let me work this number out for you with a clearly labelled hypothetical example.
A small two-buy example
The numbers in the example below are all ones I'm assuming, purely to illustrate the calculation, not any price prediction or advice. Say you bought the same asset over two trades:
| Trade | Buy price | Quantity | Amount spent |
|---|---|---|---|
| First | $100 | 10 units | $1,000 |
| Second | $80 | 30 units | $2,400 |
| Total | — | 40 units | $3,400 |
A lot of people instinctively compute "($100 + $80) ÷ 2 = $90," and that's wrong. The correct method is total money divided by total quantity: $3,400 ÷ 40 = $85. Your average cost is $85, not $90. Why lower than $90? Because you bought more (30 units) at the $80 trade, and it drags the average down harder. That's what "amount-weighted" means: the price you bought more at has the bigger say.
Do the math You don't have to compute this average by hand. In the tools, put in each trade's price and quantity and you get the average cost straight away; to work out how much to buy this time and where to put the stop, use the position size calculator.
Once you know the average cost is $85, you have your baseline: current price above $85, up on paper; below $85, down on paper. But notice I keep saying "on paper," because the distinction coming next is the one a beginner most needs to burn into their mind.
Unrealized vs realized P&L
This is the pair of concepts I most want you to remember in the whole piece. That P&L number in your account is actually two kinds, and the difference is huge:
Unrealized P&L is the on-paper gain or loss while you haven't sold. It equals (current price − average cost) × the quantity you hold, and changes up and down with every tick of price. It's alive, uncashed, and can vanish at any time. Seeing "+30%" in your account feels great, but that's only the theoretical result of "if I sold right now"; you haven't sold, so it isn't yours yet.
Realized P&L is the gain or loss locked in after you actually sell. At the moment you sell, the unrealized P&L gets "frozen" into realized, the money truly lands in the account, or the loss truly becomes fact, and from then on it no longer moves with price. To sum up both in one line: before you sell it's just a number, only selling makes it count.
Careful Many people make decisions staring at unrealized P&L, even mentally spending the "paper profit" they haven't received and adding to their position on the strength of it. The moment the market turns, that profit evaporates in an instant, and you've already made a wrong decision based on it. However good a paper gain looks, it isn't yours until it's in hand.
Why does this distinction matter so much? Because it decides your mindset when you look at the account. Treat unrealized P&L as "money already made," and you'll be on edge, panicking over a small pullback, dragged by emotion behind a number that jumps around. Understand that it's only "temporary, uncashed," and you can hold steady and act on your plan rather than on the colour on screen. The greed and panic that come from paper gains and losses are themselves emotions to keep in check.
Don't forget the hand of fees
There's another hand reaching quietly into every trade of yours, the fee. It's inconspicuous, but it genuinely affects your real P&L, and it does so twice, round trip: once when you buy, again when you sell.
That means two things. First, your real cost is a little higher than the fill price shows, the buy fee should be counted into the total cost. Second, and more easily overlooked: when price merely climbs back to your buy price, you have not truly broken even, because you still have to cover the fees on both legs to actually be even. In other words, your "true cost line" is a touch higher still than the average cost the account shows.
Term Fee: the charge an exchange takes on each fill, once on the buy and once on the sell. It raises your real buy cost and reduces what you actually receive on the sell, and the more often you trade, the more obvious the cumulative erosion.
So saving on fees is risk control too
A single fee looks small, but if you trade often, the total over a year isn't small, and it siphons from your capital steadily and silently. Pick a low-fee platform, don't dart in and out pointlessly, and every cent of fees you save is essentially another layer of cushion under your capital.
A paper gain isn't money in hand
Put the pieces above together and you get the lesson behind that friend's story at the start: a paper gain isn't money in hand. The on-paper profit is unrealized P&L, it rises and falls with price, and uncashed it isn't realized; what truly belongs to you is the realized P&L you get after selling, deducting fees, and taking the money back. In between sits a decision process you can easily get wrong out of greed or panic.
This isn't telling you to rush to sell the moment you have a paper gain, that's the other extreme, and it'll make you miss big moves too. What I mean is: see this number for what it is, and don't let an uncashed number make the decision you should be making rationally. A paper gain makes you giddy, a paper loss makes you panic, and the root of both is treating what's on paper as reality. Tell them apart, and you can sit steady.
In the end, reading your P&L isn't some flashy skill, it's the basic language of your conversation with your account. If you can't even understand what the account is telling you, there's no talk of calm decisions. Get these few words, average cost, paper gain, realized, fees, genuinely understood, and you already have an edge in composure over a lot of people whose hearts race at red and green numbers. Take it slow, and learn not to lose first. Next, I'd suggest reading how much to put in first, then using the tools to work out your own holding's average cost and how much to buy by hand.
Risk note
This article is a personal account, used to explain basic concepts, not investment advice, and it recommends no specific asset or action. Crypto is extremely volatile, and losing all of your capital is possible. Whether to take part, how much to put in, when to enter or exit, are all yours to judge and yours alone to bear. All prices, quantities, and amounts here (such as "buy price $100," "average cost $85") are hypothetical examples for illustrating the calculation, representing no prediction of any asset's price or return; the actual fee rate follows the rules of the platform you use.
Reading your P&L starts with an account with clear data and transparent fees
To tell paper from realized and compute average cost accurately, the platform has to lay out fill prices, fees, and holding P&L plainly. I use Binance myself: solid spot depth, with cost, unrealized P&L, and fees all clear at a glance. Registering with referral code BNB2301 gets you a fee discount, and as just said, the fees you save are that extra layer of cushion under your capital.