Tools
Free family investing calculators
Run the numbers for yourself. No sign-up needed.
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Junior ISA calculator
See how much your child's Junior ISA could be worth at 18 — and what it could grow to if they keep it invested afterwards.
Compound growthTheirs at 18Charts
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Junior SIPP calculator
Project a child's pension to retirement — including how the government's 25% top-up grows over a lifetime, and what waiting costs.
25% government top-upRetirement valueCost of waiting
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One-off gift calculator
Birthday money or a grandparent's lump sum — see what a single gift could become by 18, 21, 30 and retirement.
Birthday moneyGrandparent giftsMilestones
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Account comparison
Junior ISA, Junior SIPP, savings accounts and Premium Bonds side by side — limits, access ages, tax treatment, pros and cons.
ISA vs SIPPPremium BondsAt a glance
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