Build wealth · UK
Savings Calculator
See what regular saving could grow into. Set a starting pot, a monthly amount, the interest rate and how long you save, and watch your balance build with compound interest.
Interest is added monthly. An estimate to help you plan, not financial advice. Savings rates can change and interest may be taxable.
- Final balance
- £31,039
- What you put in
- £25,000
- Interest earned
- £6,039
- Saving each month
- £200
How your savings grow
Two things build your balance: the money you put in, and the interest you earn on it. Early on, most of the growth is simply your own contributions. As the pot gets bigger, the interest each year grows too, because it is paid on a larger balance. That is compounding, and it is why starting sooner and keeping it regular tends to matter more than chasing the very best rate.
Common questions
How much could I save in 10 years?
It depends on what you start with, how much you add each month and the interest rate. Put your own figures in above and the calculator shows the balance year by year, splitting out what you paid in from the interest on top.
What interest rate should I use?
Use the rate your account actually pays (the AER). Easy-access savings rates move with the Bank of England base rate, so check your provider. For a cash estimate, a rate close to current easy-access or fixed-rate deals is sensible; do not assume stock-market style returns on savings.
Does regular saving really make that much difference?
Yes. Adding a set amount every month is usually what drives the balance, more than the interest in the early years. The interest then builds on a bigger and bigger pot, so the two work together over time.
Is the interest on my savings taxed?
Most people have a personal savings allowance of £1,000 of interest a year tax-free as a basic-rate taxpayer, or £500 at higher rate. Interest inside a cash ISA is tax-free. This calculator shows the gross figure before any tax.
Can I use this as an ISA calculator?
Yes. Interest in a cash ISA is tax-free, so the balance shown is what you actually keep, with no tax to take off. Outside an ISA, interest above your personal savings allowance is taxable, so your real return could be slightly lower. Set your rate and term either way to see how the balance builds.
What is the difference between this and a compound interest calculator?
They share the same maths. This one is framed around regular saving, what a monthly amount grows into. The compound interest calculator leans on how a lump sum snowballs and lets you change how often interest is added.
About this calculator
Uses standard compounding arithmetic, adding your contribution each month and interest each month at the rate you set. It shows the gross figure before any tax, and assumes the rate stays the same throughout, which real savings rates rarely do. Treat it as a guide to help you plan, not financial advice. Last updated June 2026.