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Fixed Deposit Compound Balance & Interest Calculator

Estimate a fixed deposit or CD balance and interest from a constant rate, term and compounding frequency.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

A 1,000 deposit at 10% compounded annually for two years grows to 1,210, including 210 of interest before fees and taxes.

Balance = deposit × (1 + r/n)^(n × years); interest earned = balance − deposit

Worked example

Enter these known values and leave the other values blank.

Initial deposit
1000 USD
Nominal annual interest rate
10 %
Deposit term
2:0 yrs / mos
Compounding frequency
Yearly
Modeled final balance
1210 USD
Modeled interest earned
210 USD

Assumptions and limitations

  • Assumes all interest remains invested at one fixed rate. Fees, taxes, early-withdrawal penalties, extra deposits and changing contract rates are excluded.
  • Weekly and daily options use 52.1775 and 365.242 periods per year in this model. These average-year conventions are not a dated account accrual schedule; match the product’s actual compounding terms before comparing it.
  • The years/months input uses a colon: 2:0 means two years and zero months. Deposits and terms must be positive, with a positive periodic growth factor.

Common questions

Is this a quoted CD return?

No. It models the rate and terms you supply. Actual deposit agreements determine compounding, day counts, withdrawals and charges.

Can the rate be zero?

Yes. With no fees or other cash flows, a zero rate leaves the balance equal to the initial deposit and produces zero interest.

References

Bookify adds explicit model-domain checks: The periodic growth factor must be positive.

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