Estimate how current savings and regular deposits may grow over time with compound interest and flexible contribution timing.
Your balance grows from the money already saved, new deposits, and interest credited over time. Interest earned in one period becomes part of the balance that can earn interest in later periods.
The projection starts with the entered balance and processes each month of the selected duration. It applies recurring deposits at the chosen monthly, quarterly, or annual frequency and beginning or end timing, including any entered annual deposit increase. The chosen compounding frequency is converted to an equivalent monthly growth factor; calculations retain full precision until display.
This closed form applies to the initial balance alone; the calculator uses a month-by-month projection when recurring deposits are entered.
A = P × (1 + r ÷ n)^(n × t)Each month applies a due deposit before or after interest according to the selected timing. The monthly growth factor reflects the selected nominal annual rate and compounding frequency; annual deposit increases apply to later deposits.
ending balance = beginning balance + deposit + interest earnedStarting with $5,000 on January 1, 2026, earning 4% annually compounded monthly, and depositing $200 at each month’s end for 10 years produces a projected balance of $36,904.12. Total deposits are $29,000.00 and estimated interest is $7,904.12.
Beginning-of-period deposits receive one additional period of growth compared with otherwise identical end-of-period deposits.
More frequent compounding can modestly increase growth when the same nominal annual rate is used.
An annual contribution increase can model raising the regular deposit as income or savings capacity grows.
Savings-account rates may change, so update the projection when your actual rate changes.
Growth depends on the starting balance, deposit amounts and timing, savings duration, interest rate, and compounding frequency.
Interest is added to the balance, allowing later interest to be earned on both deposits and previously credited interest.
Yes. At the same nominal annual rate, monthly compounding generally produces slightly more growth than annual compounding.
Beginning deposits have more time to earn interest, so they produce a higher result when all other assumptions are identical.
Regular deposits increase the amount earning interest and often contribute more to the final balance than interest alone.
It raises future recurring deposit amounts once every 12 months by the entered percentage.
No. Taxes and account fees are not included.
No. Actual savings-account rates can change and banks may use different crediting conventions.