Calculator Savings Account Interest
'/%3E%3Ccircle cx='48' cy='39' r='19' fill='%23f2c9a5'/%3E%3Cpath d='M27 35c3-16 39-17 42 2-8-8-27-9-42-2z' fill='%23374151'/%3E%3Cpath d='M21 86c5-24 49-28 56 0z' fill='%232563eb'/%3E%3Ccircle cx='41' cy='41' r='2' fill='%23111827'/%3E%3Ccircle cx='55' cy='41' r='2' fill='%23111827'/%3E%3Cpath d='M42 52c4 3 9 3 13 0' stroke='%2392400e' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E)
Reviewed by Calculator Editorial Team
Savings accounts are a fundamental tool for growing your money over time through interest. This calculator helps you estimate how much your savings will grow with compound interest, based on your initial deposit, interest rate, and time period.
How Savings Account Interest Works
When you deposit money into a savings account, the bank lends that money to others and earns interest on it. This interest is then paid to you, either as simple interest (calculated only on the original principal) or compound interest (calculated on the principal plus any accumulated interest).
Simple vs. Compound Interest
Simple interest is calculated only on the original principal amount. For example, if you deposit $1,000 at 5% simple interest, you earn $50 per year. The interest doesn't grow over time.
Compound interest, on the other hand, earns interest on both the original principal and any accumulated interest. This means your money grows exponentially over time. For example, $1,000 at 5% compounded annually grows to $1,276.28 after 10 years.
Most savings accounts offer compound interest, typically compounded monthly, quarterly, or annually. The more frequently interest is compounded, the faster your money grows.
Key Factors Affecting Savings Growth
- Initial deposit: The starting amount of money you put into the account.
- Interest rate: The percentage your money earns each period.
- Compounding frequency: How often interest is calculated and added to your balance.
- Time period: The length of time your money will stay in the account.
The Interest Calculation Formula
The future value (FV) of your savings with compound interest is calculated using this formula:
For example, if you deposit $1,000 at 5% annual interest compounded monthly for 10 years:
This means your $1,000 will grow to approximately $1,647.01 after 10 years.
Worked Example
Let's calculate how much $5,000 will grow to in 5 years with a 3.5% annual interest rate compounded quarterly.
After 5 years, your $5,000 investment will grow to approximately $6,107. The total interest earned is $1,107.
| Year | Starting Balance | Interest Earned | Ending Balance |
|---|---|---|---|
| 1 | $5,000.00 | $437.50 | $5,437.50 |
| 2 | $5,437.50 | $462.50 | $5,900.00 |
| 3 | $5,900.00 | $487.50 | $6,387.50 |
| 4 | $6,387.50 | $512.50 | $6,900.00 |
| 5 | $6,900.00 | $537.50 | $7,437.50 |
This table shows how the balance grows each year with quarterly compounding. Notice how the interest earned increases slightly each year as the principal grows.
Types of Savings Accounts
There are several types of savings accounts with different features and interest rates:
| Account Type | Interest Rate | Features |
|---|---|---|
| High-Yield Savings Account | 1.00% - 5.00% | Higher interest rates than traditional savings accounts |
| Certificate of Deposit (CD) | 1.00% - 5.00% | Fixed term with penalty for early withdrawal |
| Money Market Account | 0.50% - 3.00% | Check writing and debit card access |
| Online Savings Account | 0.50% - 3.00% | No physical branch access |
| Traditional Savings Account | 0.01% - 1.00% | Low interest, easy access |
High-yield savings accounts typically offer the best interest rates, but they may have requirements like minimum balances or limited withdrawals. CDs offer fixed rates for specific terms, while money market accounts combine savings and checking features.