Total Interest Calculator UK
This total interest calculator UK helps you estimate how much interest you can earn on your savings over time. Whether you are starting with a lump sum, adding monthly deposits, or comparing different savings plans, it shows how compound interest can increase your final balance.
It is useful for UK savers who want to plan towards a target, compare account options, or understand how much of their future balance comes from contributions versus interest earned.
What this calculator includes
- Starting balance or initial deposit
- Monthly contributions or regular savings
- Annual interest rate or expected return
- Savings period in years and months
- Compound interest growth over time
- Total interest earned and projected final balance
- Multi-account support for broader comparison planning
How it works
The calculator applies interest to your balance over the selected period and adds the effect of compounding, so you earn interest not only on your original savings but also on interest already added. If you enter monthly contributions, each new deposit is added into the projection and starts earning interest from that point onward.
For broader planning, you can also compare multiple balances in one place to see your overall projected growth, but the core purpose is to show how savings interest builds over time.
Example calculation
If you start with £10,000, earn 5% annual interest and leave it invested for 5 years, your estimated results would be roughly:
- Total interest earned: about £2,760
- Final balance: about £12,760
If you also add monthly savings, your total interest can rise much faster because each contribution has more time to compound.
Why results vary
- Real savings accounts may compound daily, monthly or annually
- Interest rates can change, especially on variable-rate accounts
- Introductory bonus rates may not last for the full term
- Taxes, fees or account restrictions can affect your actual return
- Some providers cap how much balance earns the full advertised rate
Who it’s for
- UK savers planning short-term or long-term goals
- People comparing savings accounts or cash ISA options
- Anyone building an emergency fund
- Users wanting to understand compound interest in plain English
- Savers checking how regular monthly deposits affect total growth
Important note
This calculator provides estimates only and does not constitute financial, tax, savings or investment advice. Actual results may differ depending on account terms, compounding frequency, rate changes, fees and your personal tax position. Always check the provider’s terms before making financial decisions.
Use the calculator above to estimate your total interest, compare different savings scenarios and see how your balance could grow over time.