Child Wealth Calculator Simple investing for parents

CALCULATOR METHODOLOGY

How Child Wealth Calculator Projections Work

Our calculators are educational planning tools. This page explains what the projections mean, which assumptions matter most, and why the result is not a prediction.

The basic idea

A projection combines money already invested, future contributions, an assumed rate of return and time. When contributions are repeated, each contribution has a different amount of time to potentially grow. That is why starting age and contribution frequency can materially change a hypothetical result.

The assumptions you control

Starting amount

This is money assumed to be invested at the beginning of the projection. It has the longest time to compound.

Recurring contribution

This represents the amount added on a regular schedule. The calculator assumes the contribution continues consistently for the period selected.

Expected annual return

This is an assumption, not a guaranteed rate. Real investments fluctuate, may lose value, and do not earn an identical return every year. Running several return assumptions is more informative than relying on one optimistic number.

Time horizon

Time is one of the most powerful inputs because growth can build on prior growth. A longer horizon also means more uncertainty, so a long-range projection should be viewed as a scenario rather than a forecast.

What may not be included

Unless a specific calculator states otherwise, projections may not account for taxes, inflation, trading costs, account fees, changes in contribution amounts, changes in law, or the sequence of actual market returns. Those factors can materially affect real outcomes.

A better way to use the calculators

  1. Start with a contribution you could realistically maintain.
  2. Run a lower, middle and higher return assumption.
  3. Change one input at a time so you can see what drives the result.
  4. Compare starting now with starting later.
  5. Use the estimate to frame a decision—not to promise your child a future balance.

Why we show projections

The purpose is financial literacy. Seeing the relationship between time, consistency and hypothetical growth can make an abstract idea understandable. The most valuable output is often not the final dollar figure; it is understanding which choices are within a family's control.

Educational use only. Child Wealth Calculator does not provide individualized investment, tax or legal advice, and investment returns are not guaranteed.

How to interpret projections responsibly

Every calculator on Child Wealth Calculator is an educational model. It turns a small set of assumptions into an illustration so parents can compare choices. It does not forecast markets, select investments or account for every tax rule, fee, inflation change or life event.

When a calculator uses a constant annual return, that rate is a simplifying assumption. Real markets do not deliver the same return every year. A 7% illustration, for example, does not mean an account will earn 7% next year or over any particular period. The most useful approach is to test multiple return assumptions rather than relying on one result.

What the projections are good for

They are useful for comparing scenarios: starting now versus later, contributing $25 versus $100, adding a starting balance, or extending a goal date. They can help a parent understand the direction and magnitude of a decision.

What the projections leave out

Unless a specific calculator says otherwise, projections should be treated as nominal illustrations. Taxes, investment expenses, account-specific rules and inflation can reduce purchasing power or change the outcome. Eligibility rules for accounts such as 529 plans, custodial accounts and Roth IRAs should be verified with current official guidance before acting.

Our calculation philosophy

We prefer transparent assumptions over false precision. Results are rounded for readability, and the site avoids presenting an illustrative ending balance as guaranteed. Parents should use the tools to ask better questions and compare choices—not to predict an exact future.

Best practice: run a conservative case, a middle case and a more optimistic case. If your plan only works in the optimistic case, consider adjusting the contribution, timeline or goal.