About the Savings Calculator
The Savings Calculator estimates the future value of a starting balance plus regular monthly deposits at a fixed annual interest rate. It shows how time and steady saving combine through compound interest.
The model assumes interest is added monthly (annual rate ÷ 12) and each deposit is made at the end of the month. Real accounts differ in compounding, fees, taxes and changing rates, so use the figure as an illustration, never a promise or financial advice.
How to use it
- Enter your Starting savings and Monthly deposit.
- Enter the Annual interest (%) and the number of Years.
- Read the estimated future value.
Understanding the result
Example: 1,000 start, 100 per month, 5% a year for 10 years comes to roughly 17,200, of which 13,000 is money you paid in.
Even a small rate gap matters over decades; so does starting early.
The calculator caps the period at 80 years.
Real-world examples
Emergency fund. 200 a month for 3 years at 3 percent builds roughly 7,520.
Education fund. See how adding 50 more per month changes the result after 15 years.
Starting early versus late. Run the same plan for 20 and 30 years and compare.
Common mistakes
Using an optimistic rate and treating the answer as a promise. Ignoring inflation, fees and tax. Entering a monthly rate instead of the annual rate. Assuming the account really compounds monthly: banks vary.
How it works
The monthly rate is the annual rate ÷ 12. The starting balance grows by (1 + r)^n, while the deposits form an annuity worth deposit × ((1 + r)^n − 1) ÷ r, where n is the number of months. The two are added. If the rate is zero, deposits are simply multiplied by months.
Frequently asked questions
Is it financial advice?
No, it is an estimate only.
Does it include inflation?
No.
Can the rate be zero?
Yes; the result is simple addition.