This future value calculator shows how much a starting amount plus regular additions will grow to over time. You can add money monthly, quarterly or yearly, at the start or end of each period.
Future value formula
FV = PV × (1 + i)N + PMT × ((1 + i)N − 1) ÷ i
PV is the starting amount, PMT is the amount added each period, i is the rate per period (yearly rate ÷ periods per year) and N is the total number of periods. If you add money at the start of each period, the contribution part is multiplied by (1 + i).
Worked example
You start with $10,000, add $100 at the end of each month, and earn 6% a year compounded monthly for 10 years. The future value is about $34,582. You put in $22,000, so about $12,582 is interest.
Frequently asked questions
Does it matter when I add money?
Yes. Adding at the start of each period gives every contribution one extra period of growth, so the result is a little higher.
Is the result adjusted for inflation?
No. To see the result in today’s money, enter a rate after inflation, for example 4% instead of 7% if you expect 3% inflation.