Position Sizing: How Much to Risk on Each Trade

By VoxTradePro Editorial Team · Published 2026-11-06 · Updated 2026-11-08 · 10 min read

Most beginners ask "where should I enter?" Experienced traders ask a different question first: "how much do I lose if I am wrong?" Position sizing is the answer. It decides how many units of gold, oil, silver or Bitcoin you trade so that one bad trade stays a small, planned loss instead of a damaging one.

This guide explains the fixed-risk method step by step with hypothetical numbers, shows how stop distance, leverage and volatility fit in, and lists common mistakes. It is educational material, not a trading system or financial advice. For the wider picture read our risk management basics guide first, and practise any idea risk-free in the paper trading simulator.

Why position size matters more than the entry

Two traders can take the identical entry and stop. If one trades twice the size, her profit and her loss are both twice as large. Over many trades, results are driven by how large the losers are compared with the winners, and size is the one variable you fully control before the trade starts. Price direction is not.

Losses also hurt more than they look. A 10% drawdown needs an 11.1% gain to recover; a 50% drawdown needs a 100% gain. Keeping each loss small is how traders stay in the game long enough for any edge to show.

The fixed-risk formula

The method has three inputs:

Account size — the capital you are trading with.
Risk per trade — a percentage of the account you accept losing if the stop is hit (for example 1%).
Stop distance — the difference between your entry price and your stop-loss price, in price units.

Amount at risk = account size × risk percentage.
Position size = amount at risk ÷ stop distance.

Worked example (hypothetical numbers)

These figures are made up to show the arithmetic, not forecasts or levels to trade.

Account: $10,000. Risk per trade: 1% → amount at risk = $100.
A long idea on a commodity with entry at 2,000 and a stop at 1,980 → stop distance = 20 price units.
Position size = $100 ÷ 20 = 5 units (each worth $1 per price unit).

If the stop is hit, the loss is about $100, or 1% of the account. If you widen the stop to 40 because the market is more volatile, the same formula gives 2.5 units. The wider stop did not raise your risk; it lowered your size.

Real contracts have their own units: a gold futures contract, a CFD lot and a Bitcoin coin each have different value per price point. Check the contract specification and convert before you place an order. Slippage and gaps can make the real loss larger than planned, especially in fast markets.

Choosing the stop first

The order matters. Pick the stop where your idea is proven wrong — beyond a swing low, below support, or past the extreme of a pin bar or engulfing candle — and only then calculate size. A common error is to choose the size you like and squeeze the stop to fit, which places it inside normal market noise.

Some traders base the stop on volatility, for example a multiple of the Average True Range (ATR), one of the tools covered in technical indicators explained. Calm markets then allow larger size and wild markets smaller size, keeping risk per trade roughly constant.

Leverage is not position size

Futures, CFDs and crypto perpetuals let you control a large position with a small deposit. That deposit (margin) is a requirement, not a risk budget. A trader using high leverage can still risk 1% per trade if size follows the formula; a trader using none can still risk far too much. What leverage does change is how close you are to forced liquidation, so keep enough free margin that a stop is hit well before the exchange or broker closes the trade for you. See futures, spot and CFDs for how each product works.

Other limits worth setting

Total open risk. Gold, silver and Bitcoin can move together on dollar or rate news, so three positions may behave like one large bet. Cap the sum of risk across open trades.
Daily or weekly loss limit. A fixed stop-trading level helps stop emotional revenge trading.
Reduce size after drawdown. Because the formula uses current account size, risk in dollars shrinks automatically after losses.

Common mistakes

Moving the stop further away after entry to avoid a loss, which breaks the risk plan.
Sizing by "feel" or by the margin available instead of by stop distance.
Ignoring fees and spreads, which add to the cost of tight stops.
Doubling up after a loss to win it back faster.
Skipping practice. Rehearse your sizing routine on paper before using real money.

A simple pre-trade checklist

Where is the idea invalidated (stop price)?
What is my risk limit in money for this trade?
Position size = risk ÷ stop distance — converted to contract or coin units.
Is the margin comfortable, and is my total open risk within my cap?
Where will I take profit or reassess? A target that is at least as far as the stop is a common guideline, not a guarantee.

Practise it

Open the gold, Bitcoin or Brent chart, mark a stop, calculate size on paper and log the result. The paper trading tool lets you do the same with virtual orders and no capital at risk.

Educational content only. Not financial advice. Trading leveraged products carries a high risk of loss, and all numbers above are hypothetical.

Free tools for this guide

Work the numbers with the position size calculator, then rehearse the same stop and size in the paper trading simulator.

Frequently asked questions

What is position sizing in trading?

Position sizing is deciding how many units, contracts or coins to trade so that, if your stop-loss is hit, the loss equals an amount you chose in advance. It links your account size, your risk limit and the distance to your exit.

What is the position size formula?

Position size = amount you are willing to lose ÷ (entry price − stop price). For a long trade the stop is below entry; for a short trade it is above. The result is in units of the asset, which you then convert to lots or contracts.

What percentage of my account should I risk per trade?

There is no universal answer. Many educators suggest keeping the risk on a single trade to a small single-digit share of the account, and often 1% or less, so a losing streak does not cause deep drawdowns. Choose a figure you can tolerate and write it down.

Does higher leverage mean a bigger position size?

Leverage only changes how much margin the broker requires. It does not change how much you should risk. Size from the stop distance and your risk limit, then check that the margin needed is comfortably available.

Should position size change with volatility?

Often yes. When price swings are wide, a sensible stop is further away, so the same risk budget buys fewer units. Some traders measure this with Average True Range (ATR) to set the stop distance.

Is position sizing financial advice?

No. This guide is educational and uses hypothetical numbers. Not financial advice: trading leveraged products can lose more than you expect, and you should consider your own circumstances.