A fixed savings calculator estimates how much your deposit will grow by the
end of the term, based on the principal, annual interest rate, term length,
and how often interest compounds. It's a quick way to compare fixed-rate
savings offers before locking your money away.
Disclaimer : Enter numbers in your local currency — the calculation works the same regardless of currency. This estimate excludes tax on interest.
Formula
Maturity Value = P × (1 + r ÷ n)n × t
Where P = principal, r = annual interest rate (as a decimal), n = number of
compounding periods per year, and t = term in years.
Example
If Principal = 10,000, Rate = 4.5%, Term = 5 years, compounded annually:
Maturity Value ≈ 12,462.22
That's about 2,462.22 in interest earned over 5 years — with the exact figure
depending slightly on how often the interest compounds.
How Fixed Savings Connects to Your Other Calculators
A fixed savings account is one of several ways to grow a lump sum safely, so it's
worth comparing it against similar fixed-return options before deciding where to
put your money.
CD Calculator — the US equivalent of a fixed savings account; compare rates side by side if you're evaluating options across different banking systems.
FD / RD Calculator — Fixed Deposits work almost identically to fixed savings accounts; use it to compare returns across countries.
SI / CI Calculator — a fixed savings account earns compound interest, so understanding how compound interest differs from simple interest explains why compounding frequency matters.
Retirement Calculator — if you're using fixed savings as part of a low-risk portion of your retirement plan, plug the same rate in to see its long-term contribution to your goal.
Related Calculators
CD Calculator — compare against a US Certificate of Deposit.
FD / RD Calculator — compare against a Fixed Deposit or Recurring Deposit.
A fixed savings account, also called a fixed-rate bond, lets you deposit a lump sum for a set term in exchange for a guaranteed interest rate. The rate stays the same for the whole term, regardless of what happens to interest rates elsewhere.
Interest is calculated using compound interest, based on the deposit amount, the annual rate, the term, and how often interest compounds. Most UK fixed-rate accounts compound annually, though some compound monthly or pay interest out rather than reinvesting it.
Generally no, fixed savings accounts restrict or prohibit withdrawals before the term ends, and some providers charge a penalty or close the account entirely if you try to withdraw early. This is the trade-off for the higher, guaranteed rate compared to an easy access account.
In the UK, deposits with banks and building societies authorised by the Financial Conduct Authority are protected up to £85,000 per person, per institution, under the Financial Services Compensation Scheme, making fixed savings a low-risk option.
More frequent compounding means you earn interest on previously earned interest more often, slightly increasing your total return. The difference between annual and monthly compounding is usually small but becomes more noticeable with larger deposits or longer terms.
Fixed savings accounts usually offer a higher guaranteed rate in exchange for locking your money away for a set term, while easy access accounts offer flexibility with typically lower, variable rates. Fixed savings suit money you won't need until a known date, while easy access suits an emergency fund or short-term needs.