Portfolio Return Frequency Backtester

Find every historical period where an equally-weighted portfolio returned within your target range — checked daily since the youngest ticker's inception.

⚙️ One-time setup: Financial Modeling Prep API key This tool fetches historical price data from financialmodelingprep.com (free account → 250 requests/day). Enter your API key once and it will be remembered in your browser.

Backtest Parameters

Ticker Symbols — comma-separated (stocks, ETFs, mutual funds)

Window Duration — in years, decimals allowed (e.g. 2.5 = 2 years 6 months)

Target Return Range (%) — leave a field blank to mean "no limit" in that direction

Minimum return %

Maximum return %

Portfolio Return Frequency Backtester

Backtest Parameters

Fetching Data

Matching Periods