How it's calculated
PV = FV ÷ (1 + r)^t
FV is the future amount, r is the yearly discount rate as a decimal and t is the number of years. It is compound interest in reverse.
Assumptions
- One future amount, discounted with yearly compounding.
- The discount rate stays the same for the whole period.
Worked example
1,000 received in one year, discounted at 10% a year, is worth about 909.09 today.
Questions
Which discount rate should I use?
People often use the return they could get elsewhere, or expected inflation to see a value in today’s prices. Try a few rates to see the range.
Why is money later worth less than money now?
Money you have now can earn a return or buy things before prices rise, so a later amount has to be larger to be worth the same.
How does this relate to compound interest?
It is the reverse: compound interest takes an amount today forward in time; present value brings a future amount back to today.