Investing / Planning Hub

UK Savings & Investing Tools

Explore compounding, regular contributions, ISA wrappers, investment growth and inflation with planning tools built around transparent assumptions rather than return promises.

Open Compound CalculatorView all investing tools
FocusGrowth over time
ApproachScenario-based
Assumptions shownRates, fees and time horizons remain visible.
Inflation awareReal-value context is available where supported.
UK wrappersISA rules are separated from pure growth maths.
No return promiseInvestment results are hypothetical estimates.

Growth & investing tools

Compounding, contributions and long-term outcomes

Growth tool

Compound Interest Calculator

See how time, rates and regular contributions change a future balance under different compounding frequencies.

Open tool →Planning tool

Investment Return Calculator

Project a future value or work backwards from a target with optional fees and inflation.

Open tool →Calculator

UK Savings Calculator

Model regular deposits and savings interest with AER context and a yearly breakdown.

Open tool →Calculator

UK ISA Calculator

Model contributions, allowance usage and tax-free growth, including Lifetime ISA assumptions.

Open tool →Research tool

UK Inflation Calculator

Compare nominal values with purchasing power and understand the real effect of inflation.

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Investing insights

UK wrappers, compounding and long-term trade-offs

Insight

Are ISAs tax-free?

Understand how interest, dividends and capital gains are treated inside an ISA wrapper.

Read insight →Insight

How does the LISA bonus work?

Review eligibility, contribution limits and how the Lifetime ISA government bonus is applied.

Read insight →Insight

Cash ISA vs Stocks & Shares ISA

Compare risk, access and return characteristics between the two common ISA routes.

Read insight →Insight

What can £500 a month become?

A worked example of regular contributions and compound growth over a long time horizon.

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Important: Assumed savings and investment returns are illustrative. Actual investment values can fall as well as rise, fees matter and past performance does not guarantee future results. Casvia provides educational planning tools, not investment advice.