How to use this calculator
- Enter chronological positive portfolio values.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Use your own matching-period observations. These descriptive calculations are not forecasts, investment advice or a national dataset. Lists accept up to 100 comma-separated numbers; do not enter thousands separators. External deposits/withdrawals distort raw-value drawdown; use an adjusted value series.
Worked example
For the sample inputs shown above, maximum drawdown produces a first result of approximately 25. The assumptions below explain what this result represents.
What the result means
Inspect the deepest observed decline from an earlier portfolio peak and the current drawdown.
Common questions
How is the calculation performed?
Drawdownₜ = valueₜ / maximum(value₁…valueₜ)−1; maximum drawdown is the greatest peak-to-trough loss.
What does the model leave out?
Use your own matching-period observations. These descriptive calculations are not forecasts, investment advice or a national dataset. Lists accept up to 100 comma-separated numbers; do not enter thousands separators. External deposits/withdrawals distort raw-value drawdown; use an adjusted value series.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.