Using the Finance Calculator
Choose what you want to solve first. Then make the rate and number of periods agree: a monthly rate goes with monthly periods and monthly payments. Amounts are entered as positive savings balances and contributions.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Solve for
- Future value
- Present value
- 10000
- Future value
- 20000
- Payment per period
- 100
- Rate per period (%)
- 0.5
- Periods
- 60
Example result
- Result
- 20,465.5
Method and assumptions
FV = PV(1+r)^n + payment × [(1+r)^n−1]/r. Payments occur at period end. Enter positive savings and contributions.
Separate contributions from growth
An ending balance can grow because you put more money in, because the assumed return is higher, or because the money has more time to compound. Those are different effects. Keep the contribution schedule consistent when comparing rates, and distinguish a mathematical projection from a return that is contractually guaranteed. Fees and taxes need their own assumptions.
Common question
Why can the payment result be negative?
A negative saving payment means the starting balance and assumed growth already exceed the target. Under the model, money could be withdrawn each period and still reach that target.
Guide updated .