Long vs short positions explained, with P&L examples

Going long means you gain if the price rises and lose if it falls. Going short is the mirror image: you gain if the price falls and lose if it rises. The two look symmetrical, but they are not. A long’s loss has a floor at zero. On a linear contract, a short’s loss has no ceiling.

This guide covers how each works in spot and derivatives markets, with P&L worked in both directions. Examples use illustrative prices.

What “long” means

A long position is exposure that benefits from a rising price.

• On spot, going long is simply buying the asset. If you buy 0.1 BTC, you own 0.1 BTC.
• On derivatives, such as futures and perpetual futures, going long means buying contracts. You do not own the coin. You hold a contract whose value tracks it.

Either way, the arithmetic is the same:

Long P&L = quantity × (exit price − entry price)

What “short” means

A short position is exposure that benefits from a falling price.

• On derivatives, shorting is direct. You sell contracts you do not hold, and the position profits if the price drops.
• On spot, there is nothing to sell unless you already own the asset. Shorting on spot usually means borrowing it through a margin account, selling it, then buying it back later to repay the loan. Borrowing carries interest, which varies by venue.

The arithmetic flips:

Short P&L = quantity × (entry price − exit price)

Worked example: a long, both directions

• Position: long 0.1 BTC
• Entry price: $60,000.00
• Position value: 0.1 × $60,000.00 = $6,000.00

Price rises to $63,000.00. P&L = 0.1 × ($63,000.00 − $60,000.00) = 0.1 × $3,000.00 = +$300.00, a gain of 5% on position value.

Price falls to $57,000.00. P&L = 0.1 × ($57,000.00 − $60,000.00) = 0.1 × −$3,000.00 = −$300.00, a loss of 5%.

This works the same for 0.1 BTC bought on spot or a 0.1 BTC long on a linear perpetual, before fees and funding.

Worked example: a short, both directions

• Position: short 0.1 BTC perpetual
• Entry price: $60,000.00
• Notional value: $6,000.00

Price falls to $57,000.00. P&L = 0.1 × ($60,000.00 − $57,000.00) = 0.1 × $3,000.00 = +$300.00.

Price rises to $66,000.00. P&L = 0.1 × ($60,000.00 − $66,000.00) = 0.1 × −$6,000.00 = −$600.00.

The short gains when the price drops and loses when it climbs. Same formula shape, opposite sign.

Why short losses have no ceiling

The asymmetry comes from where price can go.

A price can fall to zero and no further. So the worst case for the 0.1 BTC long is BTC going to $0.00:

0.1 × ($0.00 − $60,000.00) = −$6,000.00, the full amount paid.

A price has no upper limit. Here is the same 0.1 BTC short as the price keeps rising:

Price	Short P&L	Arithmetic
$66,000.00	−$600.00	0.1 × (60,000 − 66,000)
$90,000.00	−$3,000.00	0.1 × (60,000 − 90,000)
$120,000.00	−$6,000.00	0.1 × (60,000 − 120,000)
$180,000.00	−$12,000.00	0.1 × (60,000 − 180,000)

At $120,000.00 the short has lost as much as the long could ever lose. At $180,000.00 it has lost twice that. The loss keeps growing for as long as the price does.

This applies to linear contracts, where P&L is settled in a stablecoin and moves one-for-one with price. Inverse contracts, settled in the coin itself, have different P&L curves. Check your venue’s contract specification.

What stops it in practice

On a leveraged derivatives position, the loss usually stops much sooner. When losses eat the margin down to the maintenance level, the venue liquidates the position. With isolated margin, the most a trader loses on that position is roughly the margin posted. See leverage, margin and liquidation for how that price is set.

Even so, in a fast move a position can close at a worse price than its liquidation price. Venues handle that shortfall in different ways, which varies by venue.

How leverage changes the picture

Leverage does not change the P&L formula. It changes how large that P&L is relative to the money you put up.

Take the 0.1 BTC short at $60,000.00, opened at 10x leverage:

• Margin: $6,000.00 ÷ 10 = $600.00
• Price rises to $63,000.00: P&L = 0.1 × ($60,000.00 − $63,000.00) = −$300.00
• As a share of margin: $300.00 ÷ $600.00 = 50%

A 5% move against the position has used up half the margin. The same move on an unleveraged spot long costs 5% of the position.

Long vs short at a glance

	Long	Short
Gains when	Price rises	Price falls
P&L formula	qty × (exit − entry)	qty × (entry − exit)
How to open on spot	Buy the asset	Borrow, then sell (margin account)
How to open on perps	Buy contracts	Sell contracts
Worst case, unleveraged	Price to zero; lose amount paid	No ceiling on linear contracts
Funding on perps	Pays when rate is positive	Pays when rate is negative

Costs that apply to both sides

The formulas above ignore costs, and costs are real.

• Trading fees on entry and exit. See maker vs taker fees.
• Funding payments on perpetuals, which flow between longs and shorts. See perpetual futures funding rates, explained.
• Borrow interest on spot shorts held through a margin account.
• Slippage on market orders, especially in thin books. See slippage explained.

Common mistakes

• Treating a short as a mirror of a long. The P&L formula mirrors. The risk profile does not.
• Confusing position value with margin. P&L is calculated on the full position, not the collateral.
• Selling to close and opening a short by accident. In one-way mode, a sell larger than the long opens a short with the remainder. A reduce-only flag prevents that.
• Forgetting funding on long holds. A small rate charged several times a day adds up over weeks.

Related

For how the instruments differ, read spot vs futures vs perpetuals. To set exits on either side, see take-profit and stop-loss orders on perpetuals. More guides are in trading concepts.