Trading Fee Impact Calculator
Add up commission and spread across a period of trading to see the cost per round trip, the annual drag and the break-even move.
Last reviewed
·Free · No sign-up · Runs in your browser
Costs are the only part of a trading result that is certain in advance. Returns are not. That asymmetry means costs deserve more attention than they usually get, and frequent strategies can pay more in fees across a year than they produce in gross profit.
This adds them up. Commission on both sides, the spread crossed once per round trip, multiplied by your trade frequency across whatever period you choose - along with the break-even move each round trip has to cover before anything is profit.
Result
Annual cost of trading
$14,400
- Cost per round trip
- $20
- Commission per round trip
- $16
- Spread per round trip
- $4
- Cost per month
- $1,200
- Cost over the period
- $14,400
- Volume traded
- $5,760,000
- Cost as a share of volume
- 0.25%
- Cost as a share of the account
- 36%
- Break-even move per trade
- 0.25%
This tool is for informational and educational purposes only. It is not financial or investment advice, and past performance does not guarantee future results.
Costs are certain and returns are not, which is why they deserve more attention than they usually get. A strategy trading frequently can pay more in costs over a year than it makes in gross profit.
The break-even move is how far price must travel just to cover the round trip. Strategies with small targets are far more sensitive to it than strategies with large ones.
Spread is treated as a single crossing per round trip. Slippage, financing charges and overnight funding are not included and can exceed commission on leveraged positions.
How to use the trading fee impact calculator
- Enter your trades per month and your average position size.
- Enter commission as a percentage, a flat amount, or both.
- Enter the spread as a percentage of the position.
- Read the break-even move and compare it against your typical target.
What people use this for
- Finding what a year of trading actually costs.
- Comparing a percentage fee schedule against a flat one for your position sizes.
- Checking whether a strategy with small targets survives its own costs.
- Sizing the benefit of reducing trade frequency.
Worked examples
Every figure below is produced by running this calculator against the example inputs, so the numbers always match the tool.
An active strategy on a percentage fee schedule
60 trades a month at $8,000 average size, 0.1% commission, 0.05% spread.
- Annual cost of trading
- $14,400
- Cost per round trip
- $20
- Break-even move per trade
- 0.25%
A flat-fee schedule on smaller positions
30 trades a month at $2,500 average size, $4.95 flat each way.
- Annual cost of trading
- $3,834
- Cost as a share of the account
- 19.17%
- Break-even move per trade
- 0.43%
Fee structures suit different position sizes
A flat fee is a heavy cost on a small position and negligible on a large one. A percentage fee is the reverse. Which schedule is cheaper depends entirely on your typical size, and the crossover point is easy to calculate and rarely calculated.
Running both structures through this tool with your own numbers answers the question in a minute.
The break-even move is the sharpest figure here
It is how far price has to travel just to cover the round trip. A strategy targeting a half-percent move with costs of a fifth of a percent is giving away forty percent of its gross result before it starts.
Strategies with small targets need low costs to survive at all, and this is the number that decides whether that condition holds.
What is not included
Slippage, financing and funding rates, currency conversion, withdrawal fees and market impact are all absent. On leveraged positions held for weeks, financing alone can exceed everything counted here.
The figure produced is therefore a floor on the true cost of trading, not a complete accounting of it.
Methodology and assumptions
What this calculator does, and what it deliberately does not do.
- Results are arithmetic on the numbers you enter. Nothing here predicts prices or connects to an exchange, broker or market data feed.
- Nothing you type is transmitted or stored - the calculation runs entirely inside your browser.
This tool is for informational and educational purposes only and does not constitute financial or investment advice. Past performance does not guarantee future results.
Nothing on this website is a recommendation to buy, sell or hold any security, currency, derivative or digital asset. No price is predicted and no return is promised or implied.
Trading and investing carry the risk of substantial loss, including the loss of your entire capital. Leveraged products can produce losses that exceed your deposit. Tax treatment depends on your jurisdiction and your circumstances.
Frequently asked questions
Why is commission counted twice per trade?
Because a round trip is two transactions. Entering and exiting are both charged on most schedules.
Should I include the spread?
Yes. Crossing the spread is a real cost even where no commission is charged, and on zero-commission venues it is usually the entire cost.
Does this include overnight financing?
No. Swap, funding and borrow costs are separate and can exceed commission on positions held for more than a few days.
How do I reduce these costs?
Fewer trades, larger positions relative to flat fees, tighter-spread instruments, and a fee schedule matched to your size. This tool quantifies each of those; it does not recommend a venue.
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