Junior ISA Calculator
What Could Your Child’s Junior ISA Be Worth?
Enter your monthly contribution and your child’s age to see an illustration of how their Junior ISA could grow by age 18.
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⚠ The Junior ISA allowance is £9,000/year — maximum £750/month. Contributions above this are not permitted.
I understand: This calculator provides an illustration only and does not predict actual returns. Investment values can go down as well as up — your child could get back less than you put in. This is not financial advice.
Please tick the box above before calculating.
Illustrative Pot at Age 18
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Pot at 18 · Illustrative only — not a forecast
You Invest
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Illustrative Growth
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Years to 18
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Now Find the Best Junior ISA Provider
Fees vary widely between Junior ISA providers — the wrong choice could quietly erode thousands from your child’s pot over time. See our independent comparison of the best Junior ISAs.
Compare Junior ISA Providers →Independent comparison · Updated regularly
Important: These figures are for illustrative purposes only and do not constitute financial advice. Actual returns will vary depending on market performance, fund selection, platform fees, and fee changes over time. Past performance is not a guide to future performance. The value of investments can go down as well as up — your child could get back less than you invest. Capital at risk. If you are unsure whether an investment is right for you, please seek advice from an FCA-authorised financial adviser.