Step 1
Enter Your ISA Details
Add your monthly or lump-sum contributions, expected return, and how much of your ISA allowance you plan to use. No personal details required.
Step 2
See Your Projected Outcome
Instantly view how your ISA could grow over time, including estimated returns and remaining allowance, using UK tax-year assumptions.
Step 3
Explore Your Options
Adjust contributions, time horizon, or returns to compare scenarios and understand what works best for your goals.
Free to use. UK-focused. Results are estimates only.
Choose a calculator above to get started.
How people use their ISA results
Once you've calculated your ISA outcome, there are a few common next steps people explore.
Review & adjust
Many users adjust their contributions, time horizon, or expected returns to see how small changes can affect long-term outcomes.
Consider how to invest or save
After modelling their ISA, some users look at investment platforms or savings providers that support regular contributions, low fees, and flexible access within an ISA.
Explore more advanced planning
Others can choose to explore more detailed planning. such as combining different ISA types or modelling multiple tax years.
Advanced planning
Advanced ISA Planner
For those who want a deeper view, the Advanced ISA Planner helps you explore longer-term scenarios, combine different ISA types, and model multiple tax years in one place.
It's designed for users who want more flexibility and insight than a basic calculator can provide.
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Combine Cash and Stocks & Shares ISAs
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Model multiple tax years and allowances
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Adjust returns, contributions, and time horizons
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Compare scenarios side by side
Free calculators remain avaliable. No subscription required to get started.
