The US DCA Backtest Calculator is a free web-based tool for simulating dollar-cost averaging (DCA) investment strategies using historical daily price data for major US stocks and ETFs.
What is the US DCA Backtest Calculator?
The US DCA Backtest Calculator lets you simulate a dollar-cost averaging strategy by setting a symbol, an initial lump sum (optional), a fixed periodic contribution, a contribution interval in days, and a date range. It then loads historical daily closing prices and computes your total invested, ending position value, DCA return, CAGR, total profit, number of buys, and shares accumulated—all displayed in an interactive results panel and an expandable transaction-level table.
Key Features
- Symbol selection – Choose from SPY, QQQ, VTI, AAPL, MSFT, TSLA, or TSM. The tool shows the selected symbol’s 1Y, 3Y, and 5Y annualized returns and last price.
- Flexible DCA parameters – Set an initial lump sum (optional), a fixed contribution per period, the interval in days, and any start/end date within the available data range.
- Comprehensive results summary – After running a backtest, you see DCA return (e.g., +79.27%), total profit, total invested, ending value, CAGR (e.g., +16.32%), number of buys, and total shares/units.
- Transaction details table – A sortable, expandable table listing every contribution: date, amount, closing price, units bought, cumulative units, position value, and period return.
- Market data synced – The tool loads the last 5 years of daily price data for the selected symbol; the example shows data from 2021-05-06 to 2026-07-10.
Who should use the US DCA Backtest Calculator?
- Individual investors – Backtest how a regular $100 weekly contribution into QQQ would have performed over the past five years to decide on a DCA plan.
- Financial planners – Compare the outcomes of lump-sum investing versus periodic contributions using real historical data for specific assets.
- Educators and students – Demonstrate the mechanics of dollar-cost averaging, showing how buying more shares at lower prices affects long-term returns.
What can you do with the US DCA Backtest Calculator?
- Simulate a specific DCA plan – For example, invest $100 every 7 days into QQQ from 2021-05-06 to 2026-07-10 and see a +79.27% DCA return with a CAGR of 16.32%, 269 buys, and 66.47 shares accumulated.
- Test different contribution intervals – Change the interval from 7 days to 14 or 30 days and compare how total profit and CAGR shift.
- Evaluate the effect of an initial lump sum – Add a one-time initial buy (e.g., $1,000) and see how it changes the ending value versus starting with $0.
How does the US DCA Backtest Calculator work?
Select a symbol from the dropdown (e.g., QQQ). Adjust the DCA settings: initial investment, contribution per period, interval in days, and the start/end dates. Click “Run backtest”. The tool loads historical daily closes for the chosen range, calculates each contribution based on the interval, and displays the results summary and a full transaction log.
Pricing
The calculator is free to use. No pricing tiers or limits are stated.
FAQ
Can I backtest any stock with this tool?
Only the seven symbols listed on the page are supported: SPY, QQQ, VTI, AAPL, MSFT, TSLA, and TSM. You cannot enter a custom ticker.
What date range is available?
The tool loads the last 5 years of daily price data for the selected symbol. In the example, data runs from 2021-05-06 to 2026-07-10. You can choose any start and end date within that loaded range.
How many contributions can I make?
The number of contributions depends on the interval and date range you set. The example with a 7-day interval over ~5.2 years produced 269 contributions. There is no explicit upper limit, but the tool uses the available daily data.
