Calculate the complete round trip

A review needs the result after the costs included in its definition. For a simple long position, gross price result is exit price minus entry price, multiplied by quantity and any applicable multiplier. Subtract the relevant charges to calculate the example's net result. State the currency and exactly which charges are included.

Avoid counting the same friction twice. If entry and exit are actual fills, the price result already reflects the prices you received. You can separately measure those fills against a quote reference to study execution, but subtracting the same spread again would distort the net result. Fees charged outside the fill price still need their own treatment.

For multiple entries or exits, preserve each fill and its size before combining the position. A per-share average without quantity weighting can be misleading. This beginner exercise uses one entry and one exit to make the units easy to audit. Taxes, financing and other costs may require further records; do not label a calculation comprehensive if those items are relevant but missing.