The Position Sizing Formula Every Spot Crypto Trader Needs (Crypto School Live Training)
Most traders decide how much to buy before they decide where they're wrong. That's backwards. In this Thursday investing session, we worked through a single formula that flips the order: figure out your stop first, then let the math tell you your position size.
No leverage in this example. Pure spot buying and selling, a $10,000 account, and a rule that we never lose more than 1% — $100 — on any single trade.
Two Trades That Look Different but Risk the Same
Trade A: the coin is trading at $2. The chart shows support around $1.93, so the stop goes just below it at $1.90. That's 10 cents of distance on a $2 entry — a 5% stop. The position size comes out to $2,000.
Trade B: same $2 entry, but the stop sits at $1.96. Four cents of distance, a 2% stop. The position size comes out to $5,000.
Which trade is riskier? Neither. They're identical.
5% of $2,000 is $100. 2% of $5,000 is $100. Both trades put exactly 1% of the account on the line. The tighter stop simply allows a bigger position because there's less room between entry and exit.
This is the point most people miss. A $5,000 position is not automatically riskier than a $2,000 position. Risk is defined by the distance to your stop, not by how much capital you deploy. If you want to go deeper on how stops and sizing interact, our walkthrough on how to cap losses with stop-loss placement and sizing covers the same logic with more examples.
The Formula
Here it is:
Position size = (Account size × Risk %) ÷ Distance to stop
Plug in the numbers from the session:
- Account: $10,000
- Risk: 1% = $100
- Trade A distance: 5% → $100 ÷ 0.05 = $2,000
- Trade B distance: 2% → $100 ÷ 0.02 = $5,000
- A 1% stop → $100 ÷ 0.01 = $10,000
The first two inputs are fixed. Your account is your account. Your risk tolerance is a decision you make once, not per trade. If your account is $20,000 and you risk 2%, the numerator becomes $400 and stays there. The only variable that changes trade to trade is the distance to your stop, which comes off the chart.
That's what makes this usable in real time. You read support, you place your stop, you measure the percentage gap, you divide. Done.
Why You Back Into Position Size
Plenty of traders open a chart and ask, "Do I want to buy $1,000 or $2,000 of this?" That's an arbitrary number with no relationship to where the trade actually fails.
Backing in reverses the process. You start with the loss you're willing to accept, then let the chart's structure dictate how much you deploy. Wide stop, smaller position. Tight stop, larger position. Same dollar risk either way. This is the foundation of everything else covered in our crypto risk management framework for traders.
One practical note: your position sizing math only works if your entry and stop actually execute at the levels you planned. Thin order books and wide spreads on illiquid pairs can turn a 2% stop into a 4% loss. If you're trading smaller-cap tokens on spot, it's worth buying altcoins on MEXC with deep spot liquidity rather than venues where slippage quietly breaks your risk model. MEXC's spot pairs cover most of the mid-cap market, which matters when your stop is only four cents wide.
Build the Calculator Once
Drop the formula into a spreadsheet. Lock your account size and risk percentage as static cells. Leave one input open — distance to stop. Now every trade takes five seconds instead of five minutes of mental math, and you'll never guess your size again. The position sizing rules behind consistent risk control explain how to adjust the risk percentage as your account grows.
We run live training five days a week covering DeFi, investing, and trading, and every session gets archived in the classroom so you can revisit the math whenever you need it. If you want the spreadsheet template and the recorded walkthroughs, join the Crypto Profit community on Skool and bring your questions — they get answered.
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