Not many people starting out in futures give leverage serious thought.
Most decide by gut feel whether 5x or 10x fits the moment, or whether it's fine to go past 20x like everyone else.
Of course, there's no single leverage number that's right for every situation. But there is a sensible leverage for each trade, and you can work it out.
Before you start: P&L and position size
Leverage lets you open a bigger position with less margin. Put up 500 USDT at 10x and you hold a 5,000 USDT position.
If the price then moves 1%, your P&L is 50 USDT, or 10% of your margin.
That 50 USDT comes from the 5,000 USDT position you hold. Open the same 5,000 USDT at 2x and a 1% move is still 50 USDT; the only thing that changes is the margin you need (2,500 USDT).
So before choosing leverage, you need to understand and calculate position size first.
Step 1. How much can you lose on this trade?
The first question isn't "how much leverage can I use?" but "if this trade is wrong, how much am I willing to lose?"
Set it as a share of your account, and the limit shrinks as the account shrinks, so a few losses in a row still leave money for the next trade.
For example, say you have a 10,000 USDT account and decide to lose no more than 1%, or 100 USDT, on a single trade.
1% isn't the right answer. What matters is fixing one clear number that fits your own account.
Now let's take that 100 USDT loss limit into the next step.
Step 2. Set your stop-loss
Next is the stop-loss, the price where you admit the idea was wrong. Find it from the chart, such as a recent low or a support level, and don't pull the stop closer just to fit your loss limit.
For example, you might set it 2% below your entry. For a volatile coin, you may need a wider stop of around 5%.
A wider stop only makes the position smaller in the next step; the money you can lose stays exactly what you set in Step 1.
Step 3. Calculate your position size
Once the loss limit and stop distance are set, you can calculate the position size. You work backwards to the size that loses exactly that amount when the stop is hit.
In the example, 100 ÷ 0.02 = 5,000 USDT. If you widened the stop to 5%, it shrinks to 100 ÷ 0.05 = 2,000 USDT.
You can also size the position in units of the asset. Assuming BTC is at 100,000 USDT, 5,000 USDT is 0.05 BTC. The leverage calculator does this math for you too.
Step 4. Choose your leverage
Only now does leverage come in. On the 5,000 USDT position, posting 1,000 USDT of margin is 5x; posting 500 USDT is 10x.
Changing the multiple doesn't change what you lose at the stop. What changes is the distance to liquidation.
The table below keeps the same position (5,000 USDT, stop 2% below) and changes only the leverage. Distance to liquidation uses the approximation from our earlier liquidation price article with an assumed maintenance margin rate of 0.5%, excluding fees.
| Leverage | Margin needed | Loss at stop | Distance to liquidation (approx.) |
|---|---|---|---|
| 2x | 2,500 USDT | 100 USDT | about 49.5% |
| 5x | 1,000 USDT | 100 USDT | about 19.5% |
| 10x | 500 USDT | 100 USDT | about 9.5% |
| 25x | 200 USDT | 100 USDT | about 3.5% |
| 50x | 100 USDT | 100 USDT | about 1.5% |
The key point is that the loss at the stop is 100 USDT on every row. The difference is that the position can be force-liquidated before the stop is hit.
At 50x, for example, liquidation is only about 1.5% away, so the position is liquidated before price even reaches the stop 2% below. At 25x, there are just 1.5 percentage points between the stop and liquidation, which can be dangerous if the stop order fills late in a sharp drop.
So choose the lowest leverage at which there's plenty of room between your stop and liquidation.
A wider stop also lowers the multiple you can use. Open the 2,000 USDT position with a 5% stop at 20x and liquidation is about 4.5% away, so it comes before the stop.
A handy rule: the closer leverage × stop distance (%) gets to 100%, the more likely liquidation comes before the stop.
Lower leverage does need more margin, but you don't have to post your whole account.
At 5x, only 1,000 USDT goes in as margin. The other 9,000 USDT stays in the account, so even after a stop-out you can carry on with the next trade.
Step 5. Place the order and set the stop-loss
An exchange order panel usually has a margin mode (cross or isolated), a leverage multiple, a quantity, and take-profit / stop-loss (TP/SL) fields.
Isolated margin is easier to calculate at first. With cross margin, your whole account balance is shared across positions, so a loss on one position can bring another closer to liquidation.
In practice, the order goes like this. Set leverage to the multiple from Step 4 and enter the quantity from Step 3 (5,000 USDT, or 0.05 BTC, in the example). Then put the Step 2 price in the stop-loss field and submit.
After entry, check once more that the stop order is actually in place and that the liquidation price on the position screen is further away than your stop. Actual liquidation prices vary by exchange and position, so the number on that screen matters more than the approximation.
High leverage also makes the P&L percentage on screen swing hard. When a 1% move shows something like -30%, you may be tempted to move the stop or size up to win it back.
But once you're in, the rule is not to adjust the stop. If you take a loss, go back to Step 1 and recalculate from the start.
Summary
To sum up: what you lose at the stop is position size × stop distance, and leverage isn't in that formula.
Leverage is the number that decides how much margin carries that position.
The bottom line: don't start with leverage. Decide how much you can lose, and leverage falls out of the math.