WorkingFigures

Investing calculators

Dollar-cost averaging calculator

Put the same amount in every month and time in the market does the rest. This projects it honestly: invested and growth shown separately, at a constant assumed return that reality will not match year to year.

Your plan

Whatever goes in on day one; zero is fine.

Added at the end of each month.

%

Nominal, before inflation. Long-run diversified equity averages sit near 5-8%.

How long the monthly contributions keep running. Time does most of the work.

The projection

Projected value$60,618after 15 years

You put in
$37,000
Growth
$23,618
Value at year 5
$15,303
Value at year 10
$34,595
Value at year 15
$60,618

Estimate

Worked example: 200 a month at 6% for 15 years
$0k $15k $30k $45k $60k 1 4 7 10 13 15 Value Value · 1: $4k Value · 2: $6k Value · 3: $9k Value · 4: $12k Value · 5: $15k Value · 6: $19k Value · 7: $22k Value · 8: $26k Value · 9: $30k Value · 10: $35k Value · 11: $39k Value · 12: $44k Value · 13: $49k Value · 14: $55k Value · 15: $61k Invested · 1: $3k Invested · 2: $6k Invested · 3: $8k Invested · 4: $11k Invested · 5: $13k Invested · 6: $15k Invested · 7: $18k Invested · 8: $20k Invested · 9: $23k Invested · 10: $25k Invested · 11: $27k Invested · 12: $30k Invested · 13: $32k Invested · 14: $35k Invested · 15: $37k Value Invested

Formula

value(m) = value(m−1) × (1 + r/12) + monthly, iterated month by month; invested = initial + monthly × months; growth = value − invested.

Assumptions

A CONSTANT return, compounded monthly, contributions at month end, no fees, no taxes, no inflation adjustment. Real markets deliver the average through violent detours; the projection is a planning anchor, not a promise, and this is general information, not investment advice.

FAQ

What return should I assume?
Long-run diversified stock-index returns have averaged around 7% nominal before fees, but any single decade can sit far from that. Running 4%, 6% and 8% and planning around the low case is saner than betting on one number.
Is dollar-cost averaging better than investing a lump sum?
Statistically a lump sum invested immediately wins about two times in three, because markets rise more often than not. DCA wins psychologically: it removes the timing decision and keeps people invested through drops, and for money that arrives monthly (a salary, freelance income) it is simply the only option.
Does this include fees and taxes?
No. Fund fees compound against you the same way returns compound for you: at 30 years, a 1% yearly fee eats roughly a quarter of the final pot versus a 0.2% index fund. Model fees by lowering the assumed return by their amount.

Related guides