Interactive calculator
Present Value Calculator
A dollar tomorrow is worth less than a dollar today. Present value = future value / (1 + r)^t. Enter a future amount, an interest rate, and a number of years to find what that future sum is worth now — the foundation of cost-benefit analysis and investment appraisal. In this release this page is powered by the closest available interactive widget; a dedicated widget for this topic is planned.
Inflation Rate Calculator
Inflation = (CPI_now − CPI_base) ÷ CPI_base × 100
- Change in the index: CPI_now − CPI_base = 110.00 − 100.00 = 10.00
- Proportional change: 10.00 ÷ 100.00 = 0.1000
- As a percent: × 100 = 10.00%
- Reading: prices rose — inflation.
Illustrative only — a simplified year-over-year example using a two-point CPI series. Real-world inflation measures use the full consumer basket and published index tables from the statistical authority.
How to use it
Enter the future amount.
Enter the annual discount rate.
Enter the number of years and read the present value.
What you will learn
- Compute present value of a future sum.
- Explain why the discount rate matters.
- Apply present value to investment decisions.