Dollar Cost Averaging Calculator for the S&P 500
Model a dollar-cost averaging strategy in an S&P 500 index fund. The long-term nominal average is roughly 10% per year; this calculator pre-loads that rate so you can see how monthly contributions accumulate.
Your Inputs
$
Final value (DCA)
Invested
Lump sum (same total)
How to Use
1. Enter how much you invest each month.
2. Set your expected annual return and time horizon.
The chart compares dollar-cost averaging against investing the same total as a single lump sum.
2. Set your expected annual return and time horizon.
The chart compares dollar-cost averaging against investing the same total as a single lump sum.
Calculation Method
DCA future value = PMT × [((1 + rm)^m − 1) / rm], where rm = annual rate / 12 and m = months.
Lump-sum comparison invests the same total (PMT × m) upfront, growing at the same monthly rate. Returns are assumptions, not guarantees.
Lump-sum comparison invests the same total (PMT × m) upfront, growing at the same monthly rate. Returns are assumptions, not guarantees.
Source: Annuity future-value formula; lump-sum comparison.
Frequently Asked Questions
What return should I assume for the S&P 500?
The long-term US large-cap average is about 10% nominal (roughly 7% after inflation). Both numbers are useful — model in real terms for purchasing-power projections.
Is DCA the best way to invest in the S&P 500?
It is the most realistic way for most people who invest from a paycheck. Lump-sum investing has historically beaten DCA on average, but DCA reduces timing risk and is what virtually every 401(k) participant already does.
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Investment Disclaimer: Calculations are estimates based on assumptions. Past performance does not guarantee future results. Investments involve risk, including potential loss of principal. SmartStockCalcs is not a registered investment advisor. For educational purposes only — consult a licensed financial advisor before making investment decisions.
Last updated: June 6, 2026