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Linear perpetual P&L: calculate the money, not the excitement
A platform shows a large percentage. How many quote units did you actually make or lose?
Calculate a linear perpetual result and separate it from margin-based ROI.
A linear contract's payoff changes proportionally with the underlying price under its contract specification. For a long, gross P&L is base-equivalent quantity multiplied by exit minus entry; reverse the difference for a short.
Check whether the order size is tokens, contracts or quote value. A contract multiplier may be needed before using the formula. Do not apply this simple calculation to inverse contracts or products with different settlement rules.
Subtract actual trading fees and funding paid, and add funding received where applicable. Unrealized P&L based on a displayed price is a valuation, not a guaranteed amount obtainable by closing.
Leverage changes the collateral supporting the exposure. For the same quantity and prices it does not add another multiplication to P&L. A high margin-based ROI can coexist with a modest price move and substantial liquidation risk.
Let’s work through it
- Convert contracts into base-equivalent quantity.
- Calculate gross P&L with the correct long/short sign.
- Apply costs and label both P&L currency and ROI denominator.
Let’s use numbers · hypothetical example
Paper long: 0.2 coin at 2,000, closed 2,050. Gross P&L=0.2×50=10 quote units. Total trading fees 1.20 and funding paid 0.30 leave 8.50. At 10:1, simplified opening margin on 400 notional is 40; gross ROI 25% is not a 25% coin-price gain.
Easy mistakes to watch for
- Multiplying P&L by leverage again.
- Confusing contracts with token quantity.
- Reporting gross ROI while hiding fees and funding.
Keep in mind
Real margin, fees and settlement vary. This is a linear paper example, not an instruction to open leverage.
Your turn
Recalculate the same position exiting at 1,950 with the same costs, then compare the cash result and margin percentage.
A quick check before we move on
What is net P&L in the worked long example?
- 8.50 quote units
- 100 quote units
- 25 coin units
Check answer
8.50 quote units Gross 10 minus 1.20 fees and 0.30 funding equals 8.50; leverage is not an additional P&L multiplier.
Sources and further reading
- www.bybit.com/en/help-center/article/Bybit-Calculator
- www.bybit.com/en/help-center/article/Profit-Loss-calculations-USDT-Contract
Content reviewed: 29 October 2026
Educational material with hypothetical examples. Trading can cause substantial losses. A course, pattern, stop order or past result cannot guarantee a profit or limit every loss. Practise in simulation and check current rules and product terms in your jurisdiction.