UK Savings Calculators
Simple calculators for understanding how your savings can grow, how inflation affects your money, and how regular contributions add up over time. All calculations run in your browser.
Savings & growth tools
UK Savings Calculator
How regular deposits and interest grow — with AER explained and yearly breakdown.
Open →Compound Interest Calculator
The power of compounding with daily, monthly or annual compounding frequencies.
Open →UK ISA Calculator
ISA allowance, contributions and tax-free growth — including the Lifetime ISA 25% bonus. 2026/27.
Open →Investment Return Calculator
Project growth from lump sum and monthly contributions, or work out what you need to hit a target.
Open →UK Inflation Calculator
What money is worth over time, using CPI inflation — see the real purchasing power of your savings.
Open →Savings guides
Are ISAs tax-free?
How UK ISA tax works — interest, dividends and capital gains inside an ISA wrapper.
Read →How does the LISA 25% bonus work?
The Lifetime ISA government bonus — who qualifies, how it's paid and the £4,000 annual limit.
Read →Cash ISA vs Stocks & Shares ISA
Compare the two main ISA types — risk, return, accessibility and which might suit you.
Read →How much will £500 a month grow in 20 years?
A worked example of regular saving and compound growth over two decades.
Read →Important: Casvia savings and investment calculators are educational tools. Assumed returns are illustrative only — actual investment returns can go down as well as up. Past performance is not a guide to future results. Always consider your own circumstances and seek professional advice if needed.