Free calculation · No signup required
Savings interest calculator
Estimate what one deposit could grow to if its annual percentage yield stays constant. Separate the money you put in from the interest it earns.
Currency changes only the display unit, not the calculation. The example 5% APY is illustrative, not a current account offer.
Example: 1,000 at a constant 5% APY for 12 months becomes 1,050, including 50 of interest.
How this estimate works
Final balance = initial deposit × (1 + APY ÷ 100)months ÷ 12. Interest is the final balance minus the original deposit. APY already includes the effect of compounding: do not treat it as a nominal rate and compound it a second time.
For example, 1,000 at 5% APY is 1,050 after one year and 1,102.50 after two years if the rate stays unchanged. For periods shorter than a year, this calculator uses a smooth effective-rate estimate; an actual account's daily accrual and payment rules can differ.
What it leaves out
No additional deposits, withdrawals, fees, taxes, inflation, variable rates or changes in currency value are included. This is an educational estimate, not a guaranteed return. PopaDex tracks balances; it does not hold your savings or pay interest. The calculation runs in this page without submitting the entered amounts.
For the definition and calculation of APY, see the CFPB's APY explanation. For scenarios with regular contributions, see Investor.gov's compound interest calculator.
Track the actual balance next month
An estimate helps you plan; a dated balance shows what happened. Add a savings balance to the free manual net worth tracker, or keep an offline record with the Excel template.