DCA Calculator Guide
Reference for estimating dollar-cost averaging scenarios with recurring contributions, return assumptions, fees, and time horizons.
Quick answer
Use the DCA Calculator to estimate how an initial amount plus recurring monthly contributions could grow under fixed return, fee, and time assumptions. The result is an educational estimate, not a prediction or financial recommendation.
What this tool does
The calculator models a dollar-cost averaging plan by adding regular contributions over time and applying an assumed return after fees. It helps compare contribution habits, time horizons, and fee assumptions before a more serious review.
Supported input
- Initial investment amount
- Monthly contribution
- Time horizon
- Annual return assumption
- Annual fee or expense-ratio assumption
Output
- Total invested principal
- Estimated final balance
- Estimated growth
- Year-by-year projection table
Data handling and processing behavior
Processing is handled in the browser for this tool based on the current public implementation. Avoid entering sensitive financial details unless you have reviewed the implementation and your own requirements.
Step-by-step use
- Enter your starting balance or set it to zero.
- Add a monthly contribution amount.
- Choose a time horizon.
- Set a conservative return assumption and any annual fee.
- Compare the projection with lower-return and higher-fee scenarios.
Examples
Monthly ETF contribution
Model a fixed monthly contribution with an assumed annual return and expense ratio to see how contribution size affects the long-term estimate.
Fee sensitivity
Compare the same contribution plan with 0.10%, 0.50%, and 1.00% annual fees to see how recurring costs can compound.
Assumptions and limits
- Returns are modeled as a fixed assumption.
- Real markets can be volatile and negative.
- Taxes, dividends, currency changes, trading costs, and withdrawal rules are not included.
- Contributions are modeled on a regular schedule, not exact market dates.
Common errors
Using one optimistic return
Run lower-return scenarios as well. A single optimistic input can make the plan look more certain than it is.
Forgetting fees
Small annual fees can create large differences over long horizons.
Treating DCA as risk removal
DCA changes purchase timing. It does not remove market risk.
Next steps
- DCA Calculator — estimate recurring contribution scenarios
- Compound Interest Calculator — compare lump-sum and compounding assumptions
- APY/APR Calculator — normalize rate framing before modeling growth
- Percentage Calculator — compare contribution, fee, and return changes