Fidelity Money Market Rates Calculator
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Reviewed by Calculator Editorial Team
Fidelity money market funds offer low-risk investments with competitive yields. This calculator helps you estimate your potential returns based on current rates and your investment amount. Understanding how money market rates compound can help you make informed financial decisions.
How Money Market Rates Work
Money market funds are short-term investments that typically offer higher yields than traditional savings accounts. Fidelity's money market funds invest in high-quality, short-term debt instruments like Treasury bills, commercial paper, and repurchase agreements.
Money market funds are considered low-risk investments because they are backed by collateral and have strict liquidity requirements. However, they are not FDIC-insured like savings accounts.
Key Terms
- APY (Annual Percentage Yield): The real annual rate of return, accounting for compounding.
- APR (Annual Percentage Rate): The stated annual interest rate before compounding.
- Compounding: The process of earning interest on both your initial investment and accumulated interest.
How Interest Compounds
Money market funds typically compound interest daily. This means your earnings grow faster than with simple interest. For example, if you earn 2% APR compounded daily, your balance will grow at a rate that effectively exceeds 2% annually.
APY Formula
(1 + APR/n)n - 1 = APY
Where n is the number of compounding periods per year.
Using the Calculator
Our calculator estimates your potential returns based on the current money market rate and your investment amount. Follow these steps:
- Enter your initial investment amount in dollars.
- Input the current money market rate (APR).
- Select the compounding frequency (daily, monthly, quarterly, annually).
- Enter the investment period in years.
- Click "Calculate" to see your estimated returns.
The calculator will display your future value, total interest earned, and an optional chart showing your investment growth over time.
Formula Explained
The calculator uses the following formula to calculate future value with compound interest:
Future Value Formula
FV = P × (1 + r/n)nt
Where:
- FV = Future Value
- P = Principal investment amount
- r = Annual interest rate (APR)
- n = Number of compounding periods per year
- t = Time in years
The APY is calculated using the formula shown in the "How Interest Compounds" section.
Worked Examples
Let's look at two examples to illustrate how money market rates work.
Example 1: Daily Compounding
Suppose you invest $10,000 at a 2.25% APR compounded daily for 5 years.
| Year | Future Value | Interest Earned |
|---|---|---|
| 1 | $10,230.19 | $230.19 |
| 2 | $10,465.16 | $234.97 |
| 3 | $10,705.22 | $239.06 |
| 4 | $10,950.60 | $244.38 |
| 5 | $11,201.53 | $249.93 |
After 5 years, your investment grows to $11,201.53, earning $1,201.53 in interest.
Example 2: Annual Compounding
Using the same initial investment and rate, but compounding annually:
| Year | Future Value | Interest Earned |
|---|---|---|
| 1 | $10,225.00 | $225.00 |
| 2 | $10,455.06 | $230.06 |
| 3 | $10,689.35 | $234.29 |
| 4 | $10,928.09 | $244.74 |
| 5 | $11,171.51 | $248.42 |
Notice that daily compounding yields a higher final amount ($11,201.53 vs. $11,171.51) and more interest earned ($1,201.53 vs. $1,171.51).
Frequently Asked Questions
- What is the difference between APR and APY?
- APR is the stated annual interest rate, while APY accounts for compounding and shows the real annual rate of return. For example, a 2% APR compounded daily might yield a 2.02% APY.
- How often are money market rates updated?
- Money market rates can change daily based on market conditions. Our calculator uses the current rate you input, but you should check for updates before making investment decisions.
- Are money market funds FDIC-insured?
- No, money market funds are not FDIC-insured. However, they are backed by collateral and have strict liquidity requirements, making them low-risk investments.
- Can I withdraw money from a money market fund anytime?
- Most money market funds have a 30-day holding period before you can withdraw funds without penalty. Check your specific fund's terms for details.
- How do I find my current money market rate?
- You can find the current rate on your Fidelity account statement or by checking the fund's prospectus. Our calculator uses the rate you input, so make sure it's accurate for your calculations.