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Trading ROI calculator
Simple ROI expresses net profit or loss as a percentage of starting capital. It is easy to compare but does not account for the timing of cash flows, compounding, changing exposure, or risk taken.
Updated August 31, 2026 · Educational information onlyTHE FORMULA
ROI = net profit or loss ÷ starting capital × 100
Use net P&L after the fees and costs you intend to measure. For deposits, withdrawals, or irregular cash flows, a time-weighted or money-weighted return may be more appropriate.
WORKED EXAMPLE
See how the number is produced.
Starting with $20,000 and recording $1,500 net profit gives ROI of 1,500 ÷ 20,000 = 7.5% and ending capital of $21,500 before external cash flows.
HOW TO READ IT
Interpret the result with context.
- Positive ROI means entered net P&L is positive relative to starting capital; negative ROI means it is negative.
- Two samples with the same ROI can have very different drawdown, variability, and duration.
- Do not average periodic ROI percentages to calculate a multi-period compounded return.
COMMON MISTAKES
Keep the inputs consistent.
- Using gross P&L while describing the result as net.
- Ignoring deposits and withdrawals during the measurement period.
- Averaging monthly percentages instead of compounding linked returns.
- Comparing periods of different length without making the duration clear.
COMMON QUESTIONS
Trading ROI calculator FAQ
Is ROI the same as annualized return?
No. This tool calculates simple period ROI and does not annualize it.
Can I enter a loss?
Yes. Enter net P&L as a negative number and the calculator will return a negative ROI and reduced ending capital.