Deposit growth estimate

Term Deposit Calculator

Estimate monthly-compounded term-deposit growth, maturity value, and total interest from the deposit, annual rate, and term in months.

Deposit assumptions

Enter the deposit, rate, and term

Term deposit
Deposit summary

Maturity amount and interest

Your deposit estimate will appear here

Enter a positive deposit amount, annual interest rate, and whole-number term in months.

What is Term Deposit?

This term deposit calculator illustrates how a lump-sum deposit grows when a stated nominal annual rate is compounded monthly and all interest remains in the account. It shows the principal entering each month, that month’s maturity amount and cumulative interest. The page labels money in Malaysian ringgit (RM), though the arithmetic itself is currency-neutral.

Actual fixed or term deposits follow product terms. Banks may quote an effective rate, simple maturity interest, daily accrual, a different compounding frequency or no intra-term compounding. Taxes, fees, early-withdrawal adjustments and rate tiers are not included. Confirm the institution’s disclosure before comparing the estimate with an offer.

How to Use This Calculator

  1. Enter the opening deposit amount greater than zero.
  2. Enter the nominal annual interest rate as a percentage, such as 3.6 for 3.6%.
  3. Enter a whole number of months from 1 to 1,200.
  4. Select Calculate.
  5. Read each monthly row; the final row is the modeled balance at the chosen term.

The model assumes no deposits or withdrawals after opening and reinvests each month’s interest. If the product pays interest to another account, its future balance will be lower because interest does not compound within the deposit.

Formula Used

Monthly rate = nominal annual rate ÷ 12. For month m, balance = principal × (1 + monthly rate)m. Cumulative interest equals balance minus the original deposit.

Each row uses the preceding month’s maturity as the next month’s principal. The calculation retains more precision internally and formats money to two decimals for display. This is equivalent to monthly compound interest under a constant rate. It is not the formula for a quoted annual percentage yield unless the product’s disclosure matches these assumptions.

Variables Explained

Input or columnMeaning
Deposit amountOpening principal, shown as RM on this page.
Annual interest rateNominal percentage divided by 12 for this model.
Time periodPositive whole number of modeled months.
PrincipalBalance at the start of the displayed month.
Maturity amountBalance after adding that month’s interest.
Cumulative interestDisplayed maturity amount minus the original deposit.

Worked Example

Enter RM10,000, an annual rate of 3.6% and 3 months. The monthly rate is 3.6% ÷ 12 = 0.3%, or 0.003. Month 1 interest is RM30, so the balance becomes RM10,030. Month 2 interest is RM30.09, producing RM10,060.09.

Month 3 interest is RM30.18027, producing RM10,090.27 after display rounding. Cumulative interest is RM90.27. The unrounded formula 10,000 × 1.003³ gives 10,090.27027, matching the monthly sequence.

Why Use This Calculator?

The final value is a projection under a constant nominal rate and monthly compounding. A displayed monthly schedule does not prove the financial institution compounds monthly. Some term deposits calculate simple interest as principal × rate × time; others credit interest at maturity or at a chosen frequency.

When comparing products, use disclosed effective yield or annual percentage yield on the same assumptions, and check deposit-insurance limits, eligibility, renewal instructions and early-withdrawal conditions. A longer term can lock in a rate but can also reduce access to funds and expose the depositor to reinvestment or opportunity costs if market rates change.

Formatting to two decimals can make the sum of displayed monthly changes differ by a cent from a balance calculated with hidden precision. The final modeled balance is the better reference.

A nominal 3.6% rate compounded monthly produces an effective annual rate slightly above 3.6% if maintained for a full year, because earlier interest earns later interest. To compare with an advertised effective rate, do not simply feed that effective rate into this nominal monthly model. Translate rates using the disclosed convention or compare the institution’s own maturity values. Inflation also affects purchasing power: a positive currency gain can still represent little or no real growth after changes in prices.

Common Mistakes

  • Entering 0.036 instead of 3.6 for a 3.6% rate.
  • Assuming every advertised rate compounds monthly.
  • Entering years in the months field.
  • Reading cumulative interest as that month’s interest alone.
  • Adding rounded displayed rows instead of using the ending balance.
  • Ignoring early-withdrawal rules and automatic renewal.
  • Treating a projection as a guaranteed bank quotation.

Frequently Asked Questions

Does the calculator use simple interest?

No. It models monthly compounding with interest left in the deposit.

Should I enter 3.6 or 0.036?

Enter 3.6 for a 3.6% annual rate.

Why does each principal row increase?

The previous month’s interest remains in the balance and earns interest in later months.

Does RM mean the formula only works for ringgit?

The displayed label is RM, while the numerical formula works the same for any single consistent currency.

Are taxes or fees deducted?

No. The projection is before any applicable tax, fee or adjustment.

What if my bank pays interest only at maturity?

Use the product’s stated method; this monthly-compounding model may not match it.

Is the final amount guaranteed?

No. Only the institution’s contract and disclosure determine actual payment.

Sources & References