Kids Allowance Investing Calculator
See what a portion of a child's weekly allowance could grow to if it were invested instead of spent.
How it works
Monthly invested = weekly × share% × 52 ÷ 12 · FV = monthly × ((1+r)^n − 1) ÷ r · r = annual return ÷ 12
This turns a familiar habit into a lesson in compounding: instead of asking a child to save cash in a jar, it shows what happens if part of the allowance is invested and left to grow. The weekly figure is annualised (52 weeks) and spread across 12 months so the compounding math lines up. Even small, regular amounts become surprisingly large over a childhood because every deposit keeps earning for years.
Worked example
Investing half of a $10 weekly allowance is about $21.67 a month. Over 10 years at 7%, that grows to roughly $3,750 — of which about $2,600 was the allowance and the rest is growth.
Frequently asked questions
How can a child actually invest an allowance?
A parent typically opens a custodial brokerage account (UTMA/UGMA) and buys a low-cost index fund. The child chooses how much of each allowance to route into it, which makes the trade-off between spending and investing concrete.
Why teach investing with an allowance?
It makes compounding visible on a scale a child can grasp. Watching a few dollars a week become hundreds and then thousands teaches patience and the power of starting early far better than a lecture.
Is investing an allowance worth it if the amounts are tiny?
The dollar amounts are small, but the habit and the time horizon are what matter. The lesson — pay your future self first — is the real return, and the balance itself compounds for decades if left alone.
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Educational estimate, not financial advice. Investment returns are not guaranteed.