Trading Fee Impact Calculator

Six-step workflow

1. Copy current values from the official account, platform, or journal.
2. Keep every unit consistent; do not mix ticks, points, pips, dollars, or percentages.
3. Enter the planning assumptions without changing them to force a preferred answer.
4. Calculate and read every output, including the warning below the headline number.
5. Verify instrument specifications and binding firm rules at the official source.
6. Save the result with its date and compare it with what actually happened.

Understand the output

Formula: Total costs = trades × (commission + other fees + spread/slippage estimate).

Worked example: 120 trades with $7.75 total cost each consume $930 of a $4,000 gross result, leaving $3,070.

Common mistakes: counting one-way commission as round trip, excluding losing trades, using zero slippage, and comparing gross backtests with net live results.