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Engineering ToolBox > Discount Rate
The value of a future sum can be calculated to the present worth or present value with the "discount rate"
P = F / (1 + i)n = (1)
where
F = future cash flow (positive for receipts, negative for disbursements)
PV = present value
i = discount rate
n = number of interest periods
The factor " 1 / (1 + i)n " is also known as the "single payment present worth factor".