Free calculator
What could a little each month become?
Slide the numbers around and see how money invested for a child could grow — by 18, and if it's simply left alone afterwards.
Your numbers
The current Junior ISA allowance is £9,000 a year (£750 a month).
10% is roughly the stock market's long-run historical average. Try 5% for a cautious view.
By age 18
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By age 70
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Total you paid in
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across all years
Growth did the rest
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Illustrative only. Ignores fees and tax, assumes a steady average return — real markets go up and down, and nothing is guaranteed. Not financial advice.
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The guide walks you through which account to open, what to put in it, and how to avoid the mistakes that quietly eat into these numbers.
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