Spot Trading & Returns Guide: PnL, ROI and Annualizing

Spot PnL is simpler

Spot trading has no liquidation and no funding. PnL comes mainly from the difference between buy and sell price times quantity, minus fees: PnL = (sell price − buy price) × quantity − fees.

Even so, fees and slippage erode results, especially for small or frequent spot trades. Only judge “what did this trade really earn” after costs are included.

ROI: total capital as the denominator

ROI = (final value − capital invested) ÷ capital invested. For spot, invested capital is the total amount you spent to buy (fees included); the denominator is the full principal, unlike futures ROE which divides by margin only.

The two are easy to confuse: ROE looks naturally larger because its denominator is just margin. Confirm the convention before comparing any asset or strategy, and never rank ROE against ROI directly.

Annualizing across holding periods

Earning 3% in 30 days and 3% in a year are entirely different. Simple annualization = return × (365 ÷ holding days), putting different holding periods on the same yearly ruler.

Annualizing is a linear extrapolation for comparison, not a promise. The APR calculator takes principal, annual rate and holding days to work back to the due interest.

Hidden costs of spot trading

• Round-trip taker/maker fees as a percentage of the traded amount.
• Slippage on market orders when liquidity is thin.
• Fiat on/off-ramp and on-chain transfer fees — especially for arbitrage or cross-venue moves.

Putting spot returns in clear numbers

• Use the spot PnL calculator with buy/sell price and quantity to see gross vs net profit around fees.
• Use the ROI calculator with invested capital and current value to get the return on capital.
• Annualize returns of different holding periods with the APR calculator before comparing.
• Weigh the result against the opportunity cost of not buying, to judge whether the allocation was actually worth it.

This guide is for educational purposes only and is not investment advice. Always follow your exchange's actual margin, liquidation and fee rules, and keep a buffer for extreme market moves.