Savings & Pension Calculators UK
Reviewed against official UK sources by the FreeCalculator editorial team Methodology Editorial policy
Time is the most powerful ingredient in building wealth. These tools show how regular saving and compound growth add up over the years, and help you picture the pension pot you’re on track for.
Projections use a steady assumed growth rate to illustrate compounding — real returns vary year to year.
Growing your savings
Compound interest means you earn returns on your returns, so money grows faster the longer it’s invested. The Compound Interest Calculator shows how a lump sum plus regular monthly contributions build over time, and why starting a few years earlier makes such a large difference. Remember that a cash ISA shelters the interest from tax.
Planning for retirement
Your pension is usually your biggest long-term saving, boosted by tax relief on contributions. The Pension Calculator projects the pot you might have at retirement from your current savings and monthly contributions — a useful sense-check alongside the State Pension, which tops up most people’s retirement income.
Guides
In-depth, plain-English guides that go deeper than the calculators.
Compound interest explained
The formula, why £200 a month becomes £166,000 over 30 years, and why a ten-year head start is worth more than £138,000.
Read guide →How much do I need to retire?
Target pot sizes, what the State Pension actually covers, how tax relief supercharges contributions — and a worked example from age 30.
Read guide →Frequently asked questions
- Which calculator should I use?
- To see how savings or investments grow over time, use the Compound Interest Calculator. To estimate your retirement pot from pension contributions, use the Pension Calculator.
- How does compound interest work?
- You earn interest not just on your original savings but on the interest already added, so growth accelerates over time. The Compound Interest Calculator shows the effect of the rate, the contributions and, crucially, the number of years.
- Does the pension calculator include tax relief?
- The Pension Calculator projects your pot from the contributions you enter. Each page explains its assumptions — including how contributions and growth are treated — so you can judge whether they fit your situation.
- Are the projections guaranteed?
- No. They assume a steady growth rate to illustrate compounding, but real investment returns rise and fall. Treat the figures as a guide, not a promise.
Results are estimates for guidance only and are not financial advice. See each calculator page for its worked example, sources and the date its rates were last verified.