Savings Account Calculator Ally

Use this savings account calculator to estimate how much you'll earn with Ally Bank's savings rates. The calculator accounts for compound interest and monthly contributions, helping you plan your savings goals effectively.

How to Use This Calculator

To use the savings account calculator, follow these steps:

Enter your initial deposit amount in the "Initial Deposit" field.
Specify your monthly contribution in the "Monthly Contribution" field.
Select the term length from the dropdown menu.
Choose the interest rate (APY) from the dropdown menu.
Click the "Calculate" button to see your projected balance.

The calculator will display your projected balance after the selected term, along with a growth chart showing your savings over time.

Formula Explained

The savings account calculator uses the compound interest formula to calculate future value:

Future Value = P × (1 + r/n)^(nt) + PMT × (((1 + r/n)^(nt) - 1) / (r/n))

Where:

P = Initial deposit
PMT = Monthly contribution
r = Annual interest rate (APY)
n = Number of times interest is compounded per year (12 for monthly)
t = Term length in years

This formula accounts for both the initial deposit and regular monthly contributions, with interest compounded monthly.

Worked Example

Let's calculate the future value of a savings account with the following parameters:

Initial deposit: $1,000
Monthly contribution: $200
Term length: 5 years
APY: 2.5%

Using the formula:

Future Value = $1,000 × (1 + 0.025/12)^(12×5) + $200 × (((1 + 0.025/12)^(12×5) - 1) / (0.025/12))

Calculating each part:

(1 + 0.025/12)^(12×5) ≈ 1.1347
((1.1347 - 1) / (0.025/12)) ≈ 66.73

Final calculation: $1,000 × 1.1347 + $200 × 66.73 ≈ $1,134.70 + $13,346.60 ≈ $14,481.30

After 5 years, you would have approximately $14,481.30 in your savings account.

Comparison Table

Here's a comparison of savings account growth with different interest rates:

APY	Initial Deposit	Monthly Contribution	Term	Projected Balance
1.0%	$1,000	$200	5 years	$12,210.00
2.0%	$1,000	$200	5 years	$13,440.00
2.5%	$1,000	$200	5 years	$14,481.30
3.0%	$1,000	$200	5 years	$15,533.00

This table shows how even small differences in interest rates can significantly impact your savings growth over time.

Frequently Asked Questions

What is the difference between APY and APR?: APY (Annual Percentage Yield) is the real rate of return considering compound interest, while APR (Annual Percentage Rate) is the stated interest rate without compounding. APY is always higher than APR.
How often is interest compounded in savings accounts?: Most savings accounts compound interest monthly, which means interest is calculated and added to your balance each month.
Can I withdraw money from a savings account without penalties?: Yes, you can withdraw money from a savings account without penalties, but some accounts may have withdrawal limits or restrictions.
What happens if I don't make monthly contributions?: If you don't make monthly contributions, the calculator will only show the growth of your initial deposit based on the selected interest rate and term.
Is this calculator accurate for all savings accounts?: This calculator provides an estimate based on standard compound interest formulas. Actual results may vary depending on the specific terms and conditions of your savings account.