Crypto Position Size Calculator
Enter your account balance, risk per trade, entry price and stop-loss to get the exact position size that keeps your loss on plan if the trade fails — in coins, in dollars, and as required margin if you're using leverage. Works for long or short setups, and solves backwards to find a stop-loss or check the risk on a position you've already sized.
Key takeaways
- Position size = risk amount ÷ distance between entry and stop-loss. The stop distance decides the size, not the other way around.
- Leverage changes the margin you need to post, not your dollar risk — your loss at the stop is set by position size and stop distance alone.
- A fixed dollar position size makes your real risk swing wildly between a tight stop and a wide stop; risk-based sizing keeps it constant.
- This tool also works backwards: find the stop-loss a target position size implies, or check the risk % on a trade you've already sized.
Trade risk map
Key numbers
Risk intensity
How stop-loss distance changes your position size
Using your current account balance and risk amount, here's how the position size shifts as the stop-loss gets closer to or further from entry — the same dollar risk, sized differently.
| Stop distance | Stop-loss price | Position size | Position value |
|---|
Common risk-per-trade presets
Using your current account balance, entry and stop-loss, here's the position size and dollar risk at a few commonly cited risk percentages. These are general guidance, not a rule for your specific situation — your own risk tolerance and strategy matter more than any single number.
| Risk profile | Risk % | Position size | Risk amount | Action |
|---|
Understanding position sizing
Position sizing answers one question: given how much you're willing to lose on this trade, how many coins or tokens should you actually buy or sell? It's the step traders skip most often, and the one that determines whether a string of losing trades is a normal drawdown or an account-ending event. Two traders can take the exact same entry and stop-loss and end up with completely different outcomes purely because one sized the trade correctly and the other guessed.
The risk amount — account balance multiplied by your chosen risk percentage — is fixed first. The distance between your entry and stop-loss then determines how many units that risk amount buys. A tight stop lets you size up; a wide stop forces you to size down. This calculator runs that formula on the main tab, and rearranges it to solve for a required stop-loss or to check the risk on a position you've already sized.
Why leverage doesn't increase your dollar risk
This is the most commonly misunderstood part of leveraged trading. Leverage determines how much margin — your own capital posted as collateral — is needed to open a given position size. It does not change how much you lose if your stop-loss is hit; that loss is set entirely by position size and stop distance, exactly as in the formula above. A $2,700 position needs $2,700 of your own money at 1x (spot), or roughly $270 of margin at 10x leverage — but if the stop-loss is hit either way, the dollar loss is the same. What leverage does change is your liquidation price, which moves closer to your entry as leverage increases. Your stop-loss needs to sit comfortably before that liquidation level, or the exchange will close the position for you before your own stop has a chance to.
Fixed dollar size vs. risk-based sizing
Trading the same dollar amount on every position — say, always buying $1,000 worth — feels simple, but it lets your actual risk swing wildly. A $1,000 position with a 2% stop risks $20; the same $1,000 position with an 8% stop risks $80, four times as much, purely because the setups had different stop distances. Risk-based sizing fixes the dollar risk instead and lets the position size move: targeting $100 of risk, a 2% stop allows a $5,000 position while an 8% stop allows only $1,250 — a quarter of the size, for the same $100 on the line either way. The "Stop-loss distance" table further down this page shows this relationship using your own numbers.
Position sizing for volatile altcoins
Bitcoin and Ethereum still move several percent in a normal day; smaller-cap altcoins routinely move far more. A stop-loss set too close to entry on a volatile coin is likely to be hit by ordinary noise rather than a genuine change in trend, which is why volatile assets typically need a proportionally wider stop. Because position size is risk amount divided by stop distance, a wider stop on a volatile coin automatically produces a smaller position for the same dollar risk — the formula adjusts for volatility on its own once you set the stop where the chart actually calls for it, rather than picking a fixed percentage out of habit.
A worked example
Account balance $10,000, risking 1% ($100) on a long entry at $67,500 with a stop-loss at $65,000. The stop is $2,500 away from entry (about 3.7%), so the position size is $100 ÷ $2,500 = 0.04 BTC, worth $2,700 at entry. Add a take-profit at $72,000 and the reward is $4,500 per unit against $2,500 of risk — a risk:reward ratio of about 1:1.8. On 10x leverage, that $2,700 position needs roughly $270 of margin; the $100 risk if the stop is hit doesn't change.
Trading fees eat into your risk budget
Exchange fees on both the entry and the exit are a cost on top of your intended risk, not included in the basic formula. A 0.05% taker fee on each side of a $2,700 position adds roughly $2.70 in total fees — small on its own, but it compounds across dozens of trades and matters more on tight-stop, high-frequency strategies. The advanced settings on this calculator let you add a fee percentage that's factored into a separate fee-adjusted risk figure, so the number you see is closer to your real worst case.
How much should you risk per trade?
There's no universally "correct" number, but commonly cited guidance clusters around 0.5-1% per trade for conservative accounts, 1-2% for active traders, and rarely more than 2-3% even on high-conviction setups. The reason comes down to survivability: at a steady 1% risk per trade, it takes roughly 69 consecutive losses to cut an account in half. At 5% risk per trade, only around 13-14 consecutive losses do the same damage. No strategy has a 100% win rate, so the risk percentage you choose is really a decision about how many losing trades in a row your account — and your discipline — can absorb.
Setting a stop-loss from ATR instead of a round percentage
Picking a stop at a flat "5% below entry" ignores how much the asset actually moves day to day — a stop that's comfortably wide on a calm asset can be far too tight on a volatile one, and vice versa. The Average True Range (ATR) measures an asset's typical price movement over a lookback period (14 days is standard), so a stop set as a multiple of ATR — commonly 1.5x to 3x — scales automatically with real volatility instead of a guess. For example, with a 14-day ATR of $1,200 on an entry at $67,500, a 2x-ATR stop sits $2,400 away at $65,100 (about 3.6%) — tighter or wider than that depends entirely on how the asset has actually been trading, not on a round number picked out of habit. Use the ATR helper above the stop-loss field to compute this automatically and load it straight into the calculator.
Isolated margin vs. cross margin
These two settings change what happens if a leveraged position moves against you, without changing the risk math itself. With isolated margin, only the margin allocated to that specific position can be lost — if it's liquidated, the damage is capped at the margin shown above, and the rest of your account balance is untouched. With cross margin, your entire account balance backs every open position, which can survive a larger adverse move before liquidation (more collateral is available), but a bad outcome can draw down your whole balance rather than just one position's margin. Neither setting changes your planned dollar risk from this calculator's main formula — it only changes what backs the position if the market gaps past your stop-loss or the stop isn't honored.
Glossary of terms
- Position size
- The number of coins or tokens you buy or sell on a trade — the output this calculator solves for on the main tab.
- Notional / position value
- The total dollar value of the position: position size multiplied by entry price.
- Risk amount
- The dollar amount you stand to lose if your stop-loss is hit — your account balance multiplied by your chosen risk percentage, or a fixed dollar figure you set directly.
- Risk per unit
- The dollar distance between your entry price and your stop-loss price for a single coin or token.
- Leverage
- A multiplier that reduces how much of your own capital (margin) is needed to control a given position size — it does not change your dollar risk at the stop-loss.
- Margin
- The collateral required to open a leveraged position, calculated as the position's notional value divided by the leverage used.
- Risk:Reward ratio
- The distance from entry to your take-profit divided by the distance from entry to your stop-loss — a 1:2 ratio means the potential gain is twice the potential loss.
- Long / Short
- Long means buying, profiting if price rises (stop-loss sits below entry). Short means selling first, profiting if price falls (stop-loss sits above entry).
- ATR (Average True Range)
- A volatility measure showing an asset's typical price movement over a lookback period, commonly 14 days — used to set a stop-loss that scales with real volatility instead of a fixed percentage.
- Isolated margin
- A margin mode where only the collateral allocated to one position can be lost if it's liquidated, leaving the rest of the account balance untouched.
- Cross margin
- A margin mode where the entire account balance backs every open position, giving more room before liquidation but exposing the whole balance if things go badly.
How to use this calculator
Enter your account balance
Type in the total capital in the account you're trading from.
Set your risk per trade
Choose a percentage of your account, or a fixed dollar amount, that you're willing to lose if the trade fails.
Pick a direction and enter entry and stop-loss
Choose Long or Short, then enter your planned entry price and stop-loss price.
Add leverage and a take-profit if relevant
Enter leverage to see required margin, and a take-profit price to see your risk:reward ratio.
Read your position size
Review the position size in coins and dollars, the risk amount, required margin and risk:reward ratio, then click Calculate to lock in the numbers or Clear to start a fresh trade.
Common mistakes & tips for sizing trades well
- Trading a fixed dollar size regardless of stop distance. The same position size can mean wildly different dollar risk depending on how far away the stop-loss is — size from the risk amount, not a habit.
- Confusing leverage with risk. Leverage sets your margin requirement; your stop-loss and position size set your actual dollar risk. Raising leverage without shrinking position size increases exposure, not just convenience.
- Ignoring fees. Entry and exit fees are a real cost on top of your planned risk, especially on tight-stop or high-frequency strategies.
- Moving the stop-loss after entering. Widening a stop because price is moving against you turns a planned, sized risk into an unplanned, unsized one.
- Using the same stop percentage on every asset. A 2% stop that works on Bitcoin may be far too tight for a volatile small-cap altcoin, and will get hit by normal noise.
- Sizing up on "high conviction" trades. Confidence in a setup doesn't reduce the chance it's wrong — treat every trade with the same risk discipline regardless of how sure it feels.
Example trades
A few realistic account, entry and stop-loss combinations — click one to load it into the Position Size tab above.
Your saved setups
Click "💾 Save setup" above to keep the trade you're currently sizing — it's stored privately in this browser, not sent anywhere, so it'll be here next time you visit on this device.
Fixed position size vs. risk-based sizing — a side-by-side example
Two trades, both taken with a fixed $1,000 position — the only difference is how far away the stop-loss sits. Compare that to sizing each trade to keep the dollar risk fixed at $100 instead.
| Approach | Trade A (2% stop) | Trade B (8% stop) |
|---|---|---|
| Fixed $1,000 position | Risk = $20 | Risk = $80 (4× more) |
| Risk-based ($100 target) | Position = $5,000 | Position = $1,250 (¼ the size) |
Fixed sizing let the same $1,000 position risk four times as much on the wider-stop trade, purely by accident of where the stop happened to land. Risk-based sizing holds the $100 risk steady on both trades and lets the position size do the adjusting instead — which is the entire point of calculating position size from risk rather than picking a dollar amount out of habit.
Frequently asked questions
Have feedback on this calculator, or spotted something that looks off? Use the feedback widget below or reach out via the About page — we periodically review these tools for accuracy.
- Tharp, V. K. (2007). Trade Your Way to Financial Freedom (2nd ed.). McGraw-Hill. — the core reference on position sizing as the deciding factor in trading outcomes, cited throughout this page's approach to risk-based sizing.
- Elder, A. (2014). The New Trading for a Living. John Wiley & Sons. — source of the widely used "2% Rule" for per-trade risk referenced in the risk-percentage guidance above.
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