High-Yield Savings Calculator: Earn More Interest

What this calculator can help you understand

How much more interest your savings could earn at a higher APY, in the first year and over several years.
How a monthly deposit adds to the difference over time.
What the gap is worth for your actual balance, rather than in percentages that are hard to picture.

When it’s useful

When you’ve never checked your savings rate, to see whether it’s worth looking around.
When rates change, to see what a move is worth now.
When choosing where to keep an emergency fund or a savings goal, where safety and access matter.
When comparing offers, to compare two banks’ APYs directly.

Who it’s for

Anyone with cash in checking or savings earning a low rate.
People building an emergency fund who want it to keep pace with inflation.
Savers working toward a goal, such as a down payment.

What to enter

Input	What it means	Where to find it
Savings balance	How much you’d keep in the account	Your account balance
Your current APY	Your current annual percentage yield	Your statement or your bank’s rate page
APY you could get	A higher rate you’re considering	A bank’s rate page, or Maxint Explore
Monthly deposit	What you’d add each month. Optional.	Your budget
Years	How long to compare	Your timeline

How to use it

Enter your savings balance and your current APY.
Enter the APY you could get. The calculator starts with the top savings APY in Maxint Explore’s data, with its date; you can change it.
Add a monthly deposit if you plan to keep saving.
Choose how many years to compare.
Read the extra interest in the first year, then over the full period.
Try a lower new rate to see the result if the rate falls.

Understanding your results

Extra interest in the first year is the difference between what the two rates would earn on your balance over the next 12 months.
Extra interest over the period is the difference between the two final balances, including any deposits.
Balances at each rate show where you’d end up.
The chart shows both balances, with the gap shaded.

What it doesn’t show: taxes on interest, fees, minimum balance rules, or future rate changes.

A worked example

Suppose you have $15,000 in a savings account paying 0.10% APY and you’re considering one paying 4.00% APY (a hypothetical rate), with no further deposits, over five years.

Inputs: balance $15,000; current APY 0.10%; new APY 4.00%; no monthly deposit; 5 years.
Method: each balance grows by its APY each year: $15,000 × (1 + APY)⁵.
Result: in the first year, the current account would earn $15.00 while the new one would earn $600.00, $585 more. After five years, you’d have $18,250 instead of $15,075, a difference of $3,175.
What it means: the move itself takes some effort, but the gap grows each year the money stays put.
Keep in mind: if the new rate fell during those years, the difference would be smaller.

How the result changes

$15,000 over five years, compared with 0.10% APY:

New APY	Balance after 5 years	Extra interest
3.00%	$17,389	$2,314
4.00%	$18,250	$3,175
5.00%	$19,144	$4,069

Adding $200 a month at 4.00% instead of 0.10% for five years: $31,486 versus $27,105, a difference of $4,381.

Common mistakes

Comparing an interest rate with an APY. Compare APY with APY.
Assuming the new rate is fixed. Most savings rates are variable; an introductory rate may last only a few months.
Overlooking fees and minimums. A monthly fee or a minimum balance requirement can erase the advantage.
Exceeding insurance limits. If you have more than $250,000, check how deposit insurance applies to your accounts.

What to do with your result

If the difference matters to you, compare current rates in Maxint Explore and check each bank’s terms, insurance and fees.
Consider whether some savings could go into a CD if you won’t need it for a set period.
See how this money grows over longer periods with the compound interest calculator, and whether it beats inflation with the inflation calculator.

Limitations to keep in mind

The calculator applies each APY as a constant yearly yield and leaves out taxes, fees and rate changes. The default comparison rate comes from Maxint Explore’s data on the date shown and may have changed since. Results are estimates, not offers, and not a recommendation of any bank or account.

Frequently asked questions

What is a high-yield savings account?

A savings account that pays a higher interest rate than a typical bank savings account. They’re often offered by online banks, which have lower costs. Look for FDIC insurance (or NCUA insurance at credit unions), the APY, any fees and any minimum balance.

Is my money as safe in a high-yield account?

If the bank is FDIC-insured, deposits are protected up to $250,000 per depositor, per insured bank, for each ownership category, the same as at any other insured bank. Insurance is about safety; it says nothing about the rate you earn.

Can the rate change?

Yes. Most savings account rates are variable and can change at any time, often following changes in interest rates set by the Federal Reserve. CDs lock in a rate for a set term in exchange for access to the money.

Why does the calculator use APY?

Banks must disclose the APY on deposit accounts, and it already includes compounding, so it’s the fairest way to compare two accounts.

Do I pay tax on savings interest?

Generally yes. Interest is usually taxable as income in the year it’s paid, and banks typically send a Form 1099-INT when you earn $10 or more. The calculator shows interest before tax.

Is the default rate a recommendation?

No. The default comparison rate is the highest savings APY in Maxint Explore’s data on the date shown, to give you a realistic starting point. Check the current rate and terms with the bank before opening an account.

High-yield savings calculator: see what a better rate could be worth to you