Position sizing is deciding how much capital or exposure to allocate to a single trade. It is an important risk-management tool because the size of a position affects how much you can gain or lose if the market moves.
Many traders set a maximum amount they are willing to risk on an individual trade, often expressed as a percentage of their trading capital. Smaller position sizes can help limit the impact of an individual losing trade.
How Do I Size a Position?
A common approach is to first determine the maximum amount you are willing to lose if the trade reaches your stop-loss. You can then choose a position size based on the distance between your entry price and stop-loss.
For example, if you decide that a particular trade should risk no more than 1% of your trading capital, the position size can be calculated so that a move from the entry price to the stop-loss would result in approximately that amount of loss, before fees and slippage.
The appropriate calculation depends on the asset, entry price, stop-loss, leverage, and trading strategy.
Why Does Position Sizing Matter?
Even a strategy that has been profitable historically can experience losing trades or losing streaks. Taking an oversized position can cause a single market move to have a disproportionately large impact on your capital.
This is particularly important in crypto markets, where prices can be highly volatile. Position sizing does not eliminate risk, but it can help manage how much capital is exposed to each trade.
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