SAVINGSCALCULATOR
Plan your savings goals and see how your money grows with compound interest and regular deposits over time.
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What Is a Savings Calculator?
A savings calculator estimates how your money will grow over time based on your initial deposit, regular contributions, interest rate, and compounding frequency. It accounts for the power of compound interest — where you earn interest on your interest — giving you a realistic projection of your savings trajectory. Unlike simple interest calculations, compound interest means your returns accelerate over time, making early and consistent saving particularly powerful.
How the Savings Calculator Works
Our calculator uses the compound interest formula to project your savings growth. It factors in your starting balance, monthly contributions, the annual interest rate, and how often interest compounds (daily, monthly, quarterly, or annually).
Enter Your Starting Balance
Input the amount you already have saved. Even starting with zero is fine — regular contributions matter most over time.
Set Monthly Contributions
Enter how much you plan to save each month. The 50/30/20 rule suggests putting 20% of take-home pay toward savings and debt repayment.
Choose Interest Rate & Term
Enter the annual interest rate (AER) for your savings account and how many years you plan to save. UK savings accounts currently offer 3-5% AER for easy access and up to 5.5% for fixed-rate bonds.
Review Your Projection
See your projected final balance, total deposits made, and total interest earned. Compare different scenarios by adjusting the rate or contribution amount.
Savings Growth Formula
Where FV is future value, P is the initial principal, r is the annual interest rate (as a decimal), n is the number of times interest compounds per year, t is time in years, and PMT is the regular monthly payment. This formula combines the growth of a lump sum with the growth of a regular payment stream, both compounded at the same frequency.
Tips & Best Practices
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Set up a standing order on payday so savings happen automatically before you spend
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Use a Cash ISA to shelter interest from tax — you get £20,000 per tax year
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Keep 3-6 months of expenses in an easy access account as an emergency fund
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For longer-term goals (5+ years), consider investing rather than saving — historically, investments have outpaced savings rates
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Review your savings rate annually and switch accounts if a better AER is available
Frequently Asked Questions
What Is a Savings Calculator?
A savings calculator shows how your money grows over time when you combine an initial deposit, regular contributions, and compound interest. It uses the future value formula to project your balance — helping you set realistic savings goals and compare account types before committing.
Most UK savings accounts quote an AER (Annual Equivalent Rate), which accounts for compounding. The UK Personal Savings Allowance lets basic rate taxpayers earn £1,000/year in interest tax-free (£500 for higher rate). Cash ISAs shelter all interest — no limit.
The Savings Formula
Worked Example
Cash ISA: £2,000 initial, £200/month contributions, 4.5% AER compounding monthly, over 5 years.
Over 10 years the same plan grows to ~£33,700 — more than doubling your £26,000 total contributions.
UK Savings Account Rates at a Glance (2026)
| Account Type | Typical AER | Interest Taxed? |
|---|---|---|
| Easy Access | 3.5–5.0% | Yes (PSA applies) |
| Fixed Rate Bond (1-yr) | 4.0–5.2% | Yes (PSA applies) |
| Cash ISA | 3.5–5.0% | No — fully sheltered |
| Lifetime ISA | up to 6.25% incl. bonus | No |
| Premium Bonds | ~4.4% prize equivalent | No |
Frequently Asked Questions
What is a good savings rate in the UK?
In 2026, competitive easy-access rates sit around 4–5% AER. Fixed-rate bonds and Cash ISAs can offer similar rates. Premium Bonds offer a prize-equivalent rate of around 4.4% — tax-free — though returns are variable.
What's the difference between AER and APR?
AER (Annual Equivalent Rate) shows the actual return on savings accounting for compounding — always use this to compare savings accounts. APR (Annual Percentage Rate) is used for borrowing costs. Don't compare them directly.
Should I use a Cash ISA or a regular savings account?
If you'll exceed your Personal Savings Allowance (£1,000 basic rate, £500 higher rate), a Cash ISA is usually better because interest is completely tax-free. If you're well within the allowance, the headline rate matters more than the wrapper.
How does inflation affect my savings?
If your savings account pays 4% AER and inflation is 3%, your money is only growing in real terms by about 1%. Over long periods this erosion is significant — it's why long-term goals often require investing in assets with higher return potential.
What happens if I miss a monthly contribution?
Missing one month has a small but compounding effect over time. Use the calculator above to see the impact of consistency — even adding £50/month makes a material difference over 10+ years.
Sources & Further Reading
- MoneyHelper — Compare savings accounts
- Vanguard UK — The power of compounding
- NerdWallet UK — Savings calculator guide
Related Calculators
Mandeep Singh · 25+ Years UK Financial Services
Important Information
This calculator is for informational purposes only and does not constitute financial advice, a personal recommendation, or an offer to buy or sell any investment or asset class.
Projected figures are illustrative estimates based solely on the inputs you provide. Returns are not guaranteed and actual outcomes will differ.
Past performance is not a guide to future performance, nor a reliable indicator of future results.
If you are unsure about the suitability of any investment or savings strategy for your circumstances, you should seek independent advice from a qualified financial adviser.