Savings Interest Calculator
Project the future value of your savings with compound interest in any major currency.
Your projected savings balance
Tell us your plan and we'll show how it grows over time.
How it works
What this calculator does. It estimates how much your savings could grow over time when you combine a starting deposit, regular monthly contributions and an annual interest rate. It's designed to give you a realistic picture of long-term growth, not a guaranteed forecast.
How the calculation works. Your annual interest rate is divided into twelve monthly periods. Each month, interest is added to your running balance and your next monthly deposit is added on top. Because the following month earns interest on the new, larger balance, your money compounds — small amounts steadily build into much larger sums over years. The longer the timeframe, the more dramatic the effect.
A worked example. Suppose you start with £1,000, add £200 every month and earn 4% interest a year for 10 years. You'd pay in £25,000 of your own money (£1,000 plus £200 × 120 months) and end up with roughly £30,800. The extra £5,800 or so is compound interest doing the work for you. Stretch the same plan to 20 years and the balance grows to around £75,000, even though you've only paid in £49,000.
How to read the results. "Final balance" is the projected total. "Paid in" is your own contributions, and "Interest earned" is everything above what you put in — a useful measure of how hard your money is working. Try nudging the rate or the term to see how sensitive the outcome is; a 1% difference over 20 years can be worth thousands.
Rates shown are illustrative and before tax. Real account rates can change, and savings interest may be taxable depending on where you live.
Frequently asked
Complete Guide
Emergency Fund Basics: How Much Should You Save?
An emergency fund is the cash buffer that stops a broken boiler, a redundancy or a surprise vet bill from turning into a debt spiral. It's the foundation of every other financial plan.
How many months should you cover?
A common starting point is 3–6 months of essential expenses (rent or mortgage, bills, food, transport, minimum debt payments). Closer to 3 months if you're in a stable employed role; closer to 6 months — or more — if you're self-employed, have dependants, or your income is variable.
Essentials, not lifestyle
Size your fund against the bills you can't avoid, not your full monthly spending. In a true emergency you'd cut takeaways, subscriptions and discretionary spending — so you don't need to fund them.
Where to keep it
An easy-access savings account paying competitive interest is the sweet spot. You want the money safe, instantly available, and ideally earning at least something to keep up with inflation.
Avoid tying it up in fixed-term bonds, stocks, or anything with notice periods.
How to build it
Set a monthly transfer on payday and treat it like a bill. Use our savings goal calculator to work out how long it'll take to hit your target at different monthly amounts.
Once it's full, you can redirect that monthly transfer towards a house deposit, pension top-ups, or mortgage overpayments — whatever comes next in your plan.