High-yield savings calculator
Enter what you have, what you add each month, and your account rate. See how the interest adds up.
AmaltashUse your account's rate. For reference, 3-month Treasury bills averaged 3.4% a year from 1928 to 2025.
After 5 years at the 3.40% you entered, compounded daily, you could have
You put in $22,000. Interest added $2,915.
Hypothetical illustration based on your inputs. Not a prediction, a recommendation, or the performance of any Amaltash strategy.
How it works: your balance grows at the fixed rate you enter, compounded as often as you choose. Monthly additions go in at the end of each month. Real rates change over time.
Results change each time you change an input, and as new market data is added.
Real investing is different. Fees, taxes and trading costs are not included. Past market returns do not predict future returns, and you can lose money.
See every year
| Year | Deposits | Interest that year | Total interest | Balance |
|---|---|---|---|---|
| 1 | $2,400 | $384 | $384 | $12,784 |
| 2 | $2,400 | $480 | $864 | $15,664 |
| 3 | $2,400 | $579 | $1,443 | $18,643 |
| 4 | $2,400 | $683 | $2,126 | $21,726 |
| 5 | $2,400 | $789 | $2,915 | $24,915 |
The formula
Without monthly additions: A = P × (1 + r/n)n×t. P is your deposit, r the yearly rate, n how many times a year it compounds, t the years.
With monthly additions, we add each deposit at the end of the month and let it compound from then on.
APY is the rate after a year of compounding: (1 + r/n)n − 1. Banks must show it, so compare accounts by APY.
The rule of 72. 72 divided by the rate is roughly how many years it takes to double.
Questions people ask
How much interest will I earn?
Enter your balance, what you add each month, and your rate. The calculator adds up the interest for you, year by year.
What will my savings be worth?
The big number shows it at the rate you entered. Savings rates change often, so the real number can be lower or higher.
Should I enter the rate or the APY?
Enter the rate, then pick how often it compounds. If your bank only shows the APY, enter the APY and pick Yearly. Both ways give the same answer.
Does the rate stay the same?
No. A bank can change a savings rate at any time. This calculator keeps it fixed, so use the result as a guide.
Does this include taxes?
No. Interest is usually taxed, which lowers what you keep. Fees are not included either.
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