Savings Calculator

The Savings Calculator projects how a nest egg grows under compound interest with regular monthly contributions, and it does so with an unusual level of control: six compounding frequencies, from annual down to daily. You start from an initial deposit, add a monthly contribution, set an annual interest rate and a number of years, then pick how often interest is credited. The calculator returns the final balance, your total contributions, and the total interest earned, along with a year-by-year table showing balance, contributions, and accumulated interest at the end of each year. The monthly contribution is converted to the chosen compounding period automatically — $200 a month becomes $600 per quarter or $2,400 a year — and every period earns interest before the next deposit lands. This makes it easy to answer the practical questions savers actually ask: how much faster does daily compounding grow than annual, how much of my final balance is my own money versus the bank's, and what difference does an extra $100 a month make over a decade.

1. 1

   Enter the Initial deposit and Monthly contribution in the first two fields (USD).

2. 2

   Set the Annual interest rate as a percentage and the number of Years.

3. 3

   Choose a Compounding option from the dropdown: Annually, Semiannually, Quarterly, Monthly, Weekly, or Daily.

4. 4

   Read Final balance, Total contributions, and Total interest earned in the result cards.

5. 5

   Inspect the Yearly growth table for end-of-year balances, or click Export CSV to save it.

• Modelling a high-yield savings account with daily compounding against a bond that pays annually.
• Working out how much of a 10-year certificate's final balance will be interest before locking the rate.
• Testing whether adding $100 per month to an emergency fund meaningfully shortens a savings goal.
• Showing a teenager the difference between starting to save at 18 and starting at 30.
• Comparing the same 5% rate across monthly, weekly, and daily compounding before choosing an account.
• Projecting an education fund's growth to see whether current deposits cover future tuition.

• Compare compounding frequencies with identical inputs — small differences at 3% compound into real money over decades.
• Separate the final balance into contributions and interest so you never mistake your own deposits for growth.
• Replace the 5% default with your actual APY; typical high-yield accounts pay far less, and realism keeps projections honest.
• Remember the yearly table includes the starting position as year 0, so a 10-year run ends at year 10.
• Export the CSV before changing assumptions so you can stack several scenarios side by side in a spreadsheet.
• Spot-check the first table row: after one year the balance should roughly equal the deposit plus 12 contributions plus half a year of interest.

• Switch the compounding dropdown through all six options once and watch the final balance tick up.
• Enter your real APY instead of the default 5% to keep projections grounded.
• Use the interest column to answer how much the bank paid you versus what you put in.
• Keep contributions at zero to isolate the pure effect of compounding on your lump sum.