The same buy signal in copytrading can result in a position size of 5% of capital on one account and 40% on another. The direction and entry price will match, but the load on the accounts will not.
This happens when a trade is copied but the calculation is skipped: how much money can be lost, what nominal withstands this limit, and how much space remains before liquidation.
How to calculate position size before choosing leverage
Leverage is often perceived as a lever for position size: set 10× instead of 5× and get a bigger trade. This approach is not suitable for risk control.
Suppose the account has 10,000 USDT. For one trading idea, 100 USDT of risk is allocated, and the planned exit is 2% from the entry. For a simple linear USDT-margined position, a rough nominal calculation before fees and slippage looks like this:
100 USDT / 0.02 = 5,000 USDT
With 5× leverage, this position requires about 1,000 USDT initial margin. With 10× — about 500 USDT. But a 2% price move with the same nominal still results in roughly 100 USDT change in the outcome. Leverage changed the margin requirements, not the chosen monetary risk.
Therefore, the working sequence is simple: first set the monetary limit and exit point, then the nominal size, and only then the leverage. When calculating, a margin for commissions, slippage, rounding of quantity, and possible price gaps is needed.
| Step | What is determined |
|---|
| 1. Risk limit | How many USDT can be lost on one trading idea |
| 2. Exit point | At what price move the scenario stops working |
| 3. Position size | Which nominal fits into the given monetary risk |
| 4. Leverage | How much initial margin is needed for this nominal |
Why copying coefficient is not enough
The trader and subscriber almost never have matching account conditions. Capital, free margin, already open positions, maximum instrument leverage, and even minimum quantity steps differ.
There is also a less obvious problem: several small trades can amount to a single large bet. For example, three strategies simultaneously hold longs on assets that move almost identically. Separately the positions look moderate, but together they take too large a portion of risk.
Before launching copying, several down-to-earth questions should be answered:
- what total amount is allocated for copying;
- how much loss is acceptable on one idea;
- what is the overall limit for all open positions;
- how will trades in one direction and related markets be accounted for.
A trader's past profitability does not provide these answers. It also does not guarantee that the subscriber will receive the same result: entry prices, liquidity, commissions, and account states vary.
Liquidation is an emergency boundary
Liquidation is better not used as a planned exit. The criterion depends on the margin mode and exchange rules. With isolated margin, it usually triggers when the mark price reaches the calculated liquidation price. With cross or portfolio margin, the platform may assess the maintenance margin indicator of the whole account and start liquidation upon reaching a set threshold; the mark price participates in position evaluation. The boundary is also influenced by position size, balance, and contract conditions. When nominal increases, the position may move to another risk category where maintenance margin requirements are higher.
In isolated margin mode, separate margin is allocated for the position, although automatic replenishment can change this boundary. In cross margin mode, positions use the total available balance. Loss on one reduces buffer on others, so the displayed liquidation price can change even without position changes.
The popular estimate 1 / leverage does not give an accurate liquidation price. It does not consider commissions, maintenance margin, risk categories, mark price, and exchange rules. The higher the effective leverage, the less room remains for error.
After execution, the calculation must be verified
Even a good plan remains only a plan until the order is executed. After entry, compare the calculated and actual nominal, average price, unfilled volume on open orders, margin mode, and current buffer before liquidation.
After timeout, partial fill, cancellation, or resubmission of an order, real account status is restored first. This is covered in the material on order and position reconciliation.
Order size also affects the result. A separate measurement analysis shows how nominal changes the model VWAP based on order book snapshots. This is a model, not actual CopyTrader executions, but it well illustrates why a reserve is needed in the calculation.
Finally, it is worth checking leverage, position mode, and margin type on linked accounts. The reconciliation mechanism is described in the article on synchronizing settings before copying.
Leverage should be the last number in the calculation, not the first. First decide how much money can be lost and where to exit. Then calculate the position and check if it has enough buffer before the emergency boundary.
This material is educational and is not investment advice. Trading derivatives with leverage can lead to rapid loss of funds. Formulas and interfaces vary by exchange and contract types; check your platform’s current rules before trading.
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