Calculate Interest Earnings on Savings Account
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Reviewed by Calculator Editorial Team
Calculate how much interest you'll earn on your savings account with our free online calculator. Learn about simple and compound interest, how to maximize your savings, and how to interpret your interest earnings.
How Interest on Savings Accounts Works
When you deposit money into a savings account, the bank typically pays you interest on your balance. This interest can be calculated in two main ways: simple interest and compound interest.
Key Terms: Principal (initial deposit), Interest Rate (annual percentage yield), Time (duration in years), Interest (earned amount).
Simple Interest
Simple interest is calculated only on the original principal amount. The formula for simple interest is:
Simple interest is straightforward but doesn't account for the power of compounding over time.
Compound Interest
Compound interest is calculated on the initial principal and also on the accumulated interest of previous periods. The formula for compound interest is:
Compound interest can significantly grow your savings over time, especially with longer investment periods.
Key Factors Affecting Interest Earnings
- Interest Rate: Higher rates mean more interest earned
- Time: Longer periods allow interest to compound more
- Compounding Frequency: More frequent compounding (monthly, daily) increases returns
- Account Type: Different accounts offer different rates and features
Simple Interest Calculation
Simple interest is calculated using the straightforward formula shown above. Here's how to use it:
- Identify your principal amount (initial deposit)
- Determine the annual interest rate (as a decimal)
- Decide how many years you'll keep the money in the account
- Multiply these three numbers together to get the interest earned
For example, if you deposit $1,000 at 2% annual interest for 5 years:
The total amount in your account after 5 years would be $1,100.
Compound Interest Calculation
Compound interest calculations are more complex but can yield significantly higher returns over time. The formula accounts for how interest is added to your principal each compounding period.
Key considerations:
- Annual Percentage Yield (APY) is often used instead of APR
- Compounding can be annual, monthly, quarterly, or daily
- More frequent compounding means more interest is earned
For example, if you deposit $1,000 at 2% APY compounded annually for 5 years:
Notice the difference from simple interest ($100 vs. $104.08).
| Year | Simple Interest | Compound Interest |
|---|---|---|
| 1 | $1,020 | $1,020 |
| 2 | $1,040 | $1,040.40 |
| 3 | $1,060 | $1,061.21 |
| 4 | $1,080 | $1,082.43 |
| 5 | $1,100 | $1,104.08 |
Worked Example
Let's calculate the interest earnings for a $5,000 deposit at 1.5% APY compounded monthly for 3 years.
In this example:
- Total interest earned: $138.36
- Effective annual rate: 1.52%
- Monthly compounding adds up to more interest than annual compounding
This shows how compound interest can grow your savings over time, even with relatively low interest rates.
Frequently Asked Questions
What's the difference between simple and compound interest?
Simple interest is calculated only on the original principal, while compound interest is calculated on the principal plus previously earned interest. This means compound interest grows faster over time.
How often should money be compounded?
More frequent compounding (daily, monthly) generally yields higher returns than annual compounding. However, the difference becomes less significant with very high interest rates.
What factors affect how much interest I earn?
The main factors are the principal amount, interest rate, time, and compounding frequency. Higher values in any of these categories will increase your interest earnings.
Is there a minimum balance required to earn interest?
Most savings accounts have a minimum balance requirement, typically around $100 or $200. Check with your bank for specific requirements.
Can I withdraw money from a savings account without penalty?
Most savings accounts allow unlimited withdrawals without penalty, but some may have restrictions or fees for excessive withdrawals. Always check your account terms.