Calculators

Money Market Account Calculator

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Project money market account earnings from APY, initial deposit, term, and optional regular contributions. See future value, interest, nominal rate, and a monthly amortization-style schedule.

APY Calculator MMA Calculator
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Regular contributions (optional)

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Calculation results

Future investment value

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Total interest earned

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Initial balance

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Additional deposits

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Nominal rate → APY

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All-time rate of return (RoR)

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Time needed to double investment

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Breakdown choice

View Mode

Month Deposits Interest Accrued interest Balance

Note: Additional contributions are applied at the end of each compounding period, following interest calculation. This calculator is for illustrative purposes only and does not constitute financial advice.

Estimate how much your money market account could grow. Enter APY, deposit, duration, compounding frequency, and optional contributions — then review totals, APR equivalent, and month-by-month balance growth.

How to use this money market account calculator

  1. Enter your initial deposit and the account APY (annual percentage yield).
  2. Set the time period in years and months you plan to keep funds invested.
  3. Choose how interest is compounded (monthly is common for MMAs).
  4. Optional: add regular contributions with weekly through yearly frequency.
  5. Click Calculate for projected future value, total interest, additional deposits, and a detailed schedule.

Need to convert between APR and APY first? Use the APY Calculator. For broader savings modeling with withdrawal options, see the Compound Interest Calculator.

What is a money market account?

A money market account (MMA) is a deposit account offered by banks and credit unions that earns interest — typically through compound interest at money market rates — while keeping funds relatively accessible. MMAs balance liquidity with higher yields than many standard savings accounts, making them useful for emergency funds or short-to-medium-term cash reserves.

Worked example

$100 initial deposit at 12% APY, compounded monthly, with $3 monthly contributions for 1 year:

  • Future value ≈ $149.94
  • Total interest ≈ $13.94
  • Additional deposits = $36.00
  • Nominal rate equivalent ≈ 11.39% APR

Contributions are applied at the end of each compounding period, after interest accrues — matching common calculator conventions.

MMA advantages and considerations

  • Liquidity — easier access than many CDs, though withdrawal limits may apply.
  • Competitive yields — rates often track short-term market rates.
  • FDIC / NCUA insurance — eligible deposits at insured institutions are protected up to applicable limits.
  • Minimum balances — some MMAs require higher opening deposits or charge fees if balances fall below thresholds.

We do not offer money market accounts on this site — this tool is for educational projections only. Compare live rates from your bank or credit union before opening an account.

Examples and use cases

Real-world use cases

  • Emergency fund: A household projects $5,000 in an MMA at 4.5% APY with $100 monthly additions over 2 years.
  • Rate shopping: Someone compares two MMA quotes — one at 4.8% APY monthly vs 4.75% APY daily compounding.
  • Short-term parking: A home seller models interest earned on $40,000 held for 6 months between sale and next purchase.

Convert APR to APY with the APY Calculator. For credit card payoff planning, try the Credit Card Payment Calculator. For reward math, use the Cash Back Calculator.

Common questions

Quick answers before you start calculating.

It projects how an MMA balance could grow from an initial deposit, quoted APY, compounding frequency, and optional contributions. Use the Money Market Account Calculator for illustrative planning — not as a bank quote.