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Infinix Calculators
Financial Calculators

Money Market Yield & Interest Calculator

Calculate money market account (MMA) interest earnings, compounding growth, and ending balance with monthly deposits.

Interactive Calculator

1. Provide Details

$
$
%
yrs

2. Output Results

Ending Account Balance22,982.3 $
Total Principal Deposited20,800 $
Total Interest Earned2,182.3 $

How to Calculate: Formula & Steps

Applies compound interest formula with monthly annuity contributions compounding at rate r = APY/100.

Formula Used:A = P(1 + r/n)^(nt) + PMT × [ ((1 + r/n)^(nt) - 1) / (r/n) ]

Step-by-Step Calculation Example

A $10,000 initial deposit at 4.5% APY with $300 monthly deposits grows to $22,785 in 3 years ($1,985 total interest earned).

Inputs and Assumptions

Enter values that match your project or situation. The calculator uses the following fields and defaults; update them before relying on the estimate.

Initial Deposit ($)
Default: 10000 $
Monthly Contribution ($)
Default: 300 $
Annual Percentage Yield APY (%)
Default: 4.5 %
Time Period (Years)
Default: 3 yrs

Common Mistakes to Avoid

  • Confusing Money Market Accounts (bank savings product) with Money Market Mutual Funds (brokerage product).

Practical Use Cases

  • Emergency fund yield planning
  • Comparing high-yield savings vs money market accounts

Expert Tips

  • Money market accounts often tier rates based on account balance—maintain minimum thresholds for top APY tiers.

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.

Frequently Asked Questions About Money Market Yield & Interest Calculator

How do I calculate money market account interest?
Money market accounts compound interest, usually daily or monthly. Use A = P(1 + r/n)^(nt) for a lump sum, adding monthly deposits as an annuity if you contribute regularly. A $10,000 deposit at 4.5% APY compounded monthly with $300/month added grows to roughly $22,785 after 3 years. Model your own numbers with our free Money Market Interest Calculator.
What is the difference between a Money Market Account (MMA) and a Money Market Mutual Fund?
A Money Market Account is an FDIC-insured bank deposit product with a variable interest rate, check-writing privileges, and limited monthly withdrawals. A Money Market Mutual Fund is a brokerage investment product that holds short-term debt instruments and is not FDIC-insured, though it is generally considered low-risk.
How is APY different from the stated interest rate on a money market account?
The stated (nominal) interest rate does not account for compounding within the year, while APY (Annual Percentage Yield) reflects the actual annual return including compounding frequency. A 4.4% rate compounded daily yields a slightly higher APY, around 4.5%, than the nominal rate alone would suggest.
Do money market accounts have minimum balance requirements?
Many banks tier their money market APY by balance — you often need to maintain a minimum balance (commonly $1,000 to $25,000+) to earn the top advertised rate, and falling below that threshold can drop your account into a lower rate tier or trigger a monthly fee.
Are money market accounts a good place for an emergency fund?
Yes, for many savers — money market accounts combine FDIC insurance (up to $250,000 per depositor, per bank), competitive interest rates, and liquidity (check-writing or debit card access in many cases), making them a common choice for emergency funds compared to a standard low-yield savings account.
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Editorial contact: Vaughn Mercer
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