This time value of money calculator, provided by Hesapstan, converts a single amount between present value and future value using your own annual rate and duration assumptions.
What does this time value of money calculator do?
This calculator applies the time value of money idea to one amount. It can project today's amount forward or discount a future amount back to today's value under a single annual compounding assumption.
The result includes the converted value, the absolute difference, and the conversion multiplier. That makes the page useful for quick scenario analysis, not just for seeing one final number.
This calculator does not use CPI, TÜFE, or any official historical index series. The annual rate is entered by the user. The result is an assumption-based estimate, not a source-backed purchasing-power equivalent.
Present value versus future value
Future value mode answers: if I have this amount now, what would it become after the selected time at the entered annual rate? Present value mode answers the reverse: if I need or expect a future amount, what is its equivalent today under that rate assumption?
- Future value multiplies the amount by the annual compounding factor.
- Present value divides the future amount by the same compounding factor.
- If you enter months, the calculator converts months to years by dividing by 12 before applying the formula.
The same number can mean today's amount in FV mode or a future amount in PV mode. Always choose the direction before interpreting the result.
How the calculation works
The formula assumes annual compounding. In FV mode, the amount grows by the same annual factor for the selected duration. In PV mode, that factor is used in reverse to discount the future amount.
- Choose the conversion direction: future value of a present amount, or present value of a future amount.
- Enter the amount. Its meaning depends on the selected direction.
- Enter the annual rate. It may represent an interest assumption, return assumption, or inflation assumption depending on your scenario.
- Enter the duration in years or months.
- Read the converted value together with the difference and multiplier.
The rate field is not automatically an interest rate, an inflation rate, or a market return. It is a user-entered assumption, so the interpretation must come from your scenario.
Example: converting today's amount to a future value
Suppose you want to estimate the future value of 50,000 at an annual assumed rate of 30% for 3 years. Select future value mode, enter 50,000, 30, and 3 years.
The multiplier is (1 + 0.30)^3 = 2.197. The result is about 109,850. The difference is about 59,850. This does not mean the money will actually earn that amount; it means the chosen annual rate has been applied as a compound assumption.
If you enter 18 months, the calculator uses 1.5 years. This helps with scenarios that do not fit a whole-year period.
When this calculator is not the right tool
This page handles a single amount. Other financial questions need different models because the cash-flow structure or data source is different.
- Use a savings calculator when there are regular contributions.
- Use a compound interest calculator when the product is specifically about interest growth from a rate.
- Use an NPV calculator when you have multiple period cash flows to discount.
- Use an inflation or CPI-based tool only when the calculation is backed by an official index dataset.
A CPI-index conversion would require verified monthly index levels, source labeling, last available month, and an update procedure. This calculator intentionally does not approximate that with hand-entered or inferred data.
Frequently Asked Questions
Is this an inflation calculator?
No. You may enter an inflation assumption as the rate, but the calculator does not use official CPI or TÜFE data.
What is the difference between PV and FV?
Future value moves today's amount forward. Present value discounts a future amount back to today using the same rate assumption.
Can I enter the duration in months?
Yes. Months are divided by 12 and then used as years in the annual compounding formula.
Does it support negative rates?
No. This version supports zero or positive annual rates only.
Is the result guaranteed?
No. It is a mathematical estimate based on user-entered assumptions, not a promise of return or purchasing power.