Contributions and assumed return

Investment Calculator

Project an initial amount plus recurring contributions under an assumed return. The return is an assumption, not a guarantee.

Your numbers

Investment projection

Starting amount, recurring contributions, and an assumed return. Not a guarantee.

Starting amount$

Recurring contribution$

Assumed annual return%An assumption, not a forecast

Yearsyears

Compounding and contribution timing

Both default to monthly, which is what most accounts do.

Compounding

Contribution frequency

Estimated ending value

$54,713.58Under the return assumption you entered

Starting principal$10,000.00

Total contributions$24,000.00

Modeled growth$20,713.58

How we got this

Starting amount$10,000.00
Total contributions$24,000.00
Modeled growth7% assumed return$20,713.58

What we assumed

The return is an assumption you typed, not a forecast, guarantee, or market quote.
Contributions are added at the end of each contribution period.
Taxes, fees, and inflation are not included.
This is not investment advice.

Technical details

Method investment-v1.0.0Data Manual inputs / fixed rules

Guide

Investment growth under an assumed return

CostAnswer editorialIndependent calculator publisher

An initial amount plus recurring contributions grows at the annual return you type. That return is an assumption you supplied. It is not a forecast, not a historical average unless you chose one, and not a guarantee.

What “assumed return” hides

Real portfolios move year to year. Sequence of returns, fees, taxes, and contributions that stop in a recession are not in a smooth compounding line. Use the result to see sensitivity: 5% versus 8% is more honest than treating 8% as a plan.

Questions about this calculator

What return should I type?

There is no CostAnswer default that is “the market.” Pick an assumption you can defend, then try a lower one. This is not advice to expect any particular return.

Terms used here

Assumed return: A constant annual rate you typed. Not a predicted market outcome.
Recurring contribution: An amount added on a schedule. Timing is a model simplification.

Practical tips

Run inflation beside this if the goal is future buying power.
Fees of 1% a year are a different assumed return; subtract them yourself.

Limits and caveats

Projection, not a forecast, and not investment advice.

Results are for information. They are not legal, tax, medical, or financial advice. How the math is maintained · Report a wrong figure.

Engine notes

Rounding, versioning, and omissions that sit beside the guide rather than repeating it.

Projection. Starting amount plus recurring contributions grow at a constant assumed return. Compounding frequency and contribution timing are explicit.
Zero-contribution fixture. Annual compounding of $10,000 at 7% for 10 years with no contributions is $10,000 × 1.07^10 ≈ $19,671.51.
Not Compound Interest. The Compound Interest Calculator is the pure compounding surface. This page is the contribution-aware investment projection.

Calculation receipt

What each number here is

This answer is arithmetic on what you enter. No outside dataset is involved, so nothing here can go out of date.

Growth is your contributions at a rate of return you choose. No published figure decides what markets will do.