The Present Value of Cash Flows Calculator discounts a series of uneven future cash flows back to a single value today, the same underlying math behind net present value, but focused purely on the discounting itself rather than an investment decision that nets out an initial cost. Enter up to four cash flows occurring at different future periods and a discount rate, and the calculator returns their combined present value.
Most real cash flow projections, whether for a small business, a project, or an investment, are not level, equal payments each period. This calculator handles that realistic case directly, discounting each individual cash flow back to today according to how far in the future it occurs, then summing the results into one comparable figure.
*These results are estimates for information only, not investment advice.*
Discount each cash flow individually, then sum
Each cash flow is discounted back to today using Present Value = CF(t) / (1 + i)^t, where CF(t) is the cash flow occurring in period t and i is the discount rate per period.
The total present value of the series is simply the sum of every individual cash flow's discounted value: Total PV = Sum of [CF(t) / (1 + i)^t] across every period.
Take four cash flows: $0 at period 0, $500 at period 1, $700 at period 2 and $900 at period 3, all discounted at an 8% rate per period. The $0 flow contributes nothing. The $500 flow at period 1 discounts to $500 / 1.08, or approximately $462.96. The $700 flow at period 2 discounts to $700 / 1.08^2, or approximately $600.14. The $900 flow at period 3 discounts to $900 / 1.08^3, or approximately $714.45. Adding all four contributions together gives a total present value of approximately $1,777.55.
See why later cash flows contribute proportionally less
Notice that the $900 cash flow at period 3, the largest individual amount in the series, discounts down to about $714.45, less than the $900 face amount would suggest, because it is the flow furthest in the future and therefore subject to the most discounting.
The $500 flow at period 1, despite being the smallest amount, retains more of its face value in present terms (about 92.6% of its $500 face amount) because it is discounted for only a single period.
This pattern, where the timing of a cash flow matters as much as its size, is the central insight of any present value calculation involving multiple flows spread across different future periods.
Connect this to net present value
Net present value takes this exact same discounting calculation and subtracts an initial investment or cost from the total, to answer whether an investment is expected to earn more than its discount rate.
This calculator isolates just the discounting half of that calculation, the present value of the future cash flows alone, which is useful whenever the goal is to value a series of expected receipts on its own, without netting out an upfront cost.
Someone who already has an initial investment figure in mind can simply subtract it from this calculator's total present value result to arrive at a net present value figure, exactly matching a dedicated NPV calculation.
Choose an appropriate discount rate for the series
The discount rate applied should reflect the risk and opportunity cost of the specific cash flows being valued: a higher rate implies more risk or a higher required return, and it lowers the present value of every flow in the series, with the effect compounding more heavily on flows further in the future.
Testing this calculation at a few different discount rates, for instance both 8% and 10% on the same cash flow series, shows how sensitive the total present value is to that single assumption.
Know what this calculation assumes
This calculation assumes a single constant discount rate applies to every cash flow in the series regardless of when it occurs, and that all cash flow amounts and timings are known with certainty.
Real projects often carry genuine uncertainty about both the size and timing of future cash flows, and different cash flows within the same project might reasonably warrant different discount rates if their underlying risk differs.
Use the Present Value of Cash Flows Calculator to discount a known or projected series of uneven cash flows to a single comparable present value, and combine it with a known initial cost separately to reach a full net present value figure if needed.
Frequently asked questions
How is the present value of uneven cash flows calculated?
The present value of uneven cash flows is calculated by discounting each individual cash flow using CF(t) / (1 + i)^t, where t is the period the cash flow occurs in, and then summing all of the discounted values together into one total.
What is the present value of cash flows of $0, $500, $700 and $900 at an 8% discount rate?
Discounting $0, $500, $700 and $900, occurring at periods 0 through 3, at an 8% rate per period produces a total present value of approximately $1,777.55, with each later cash flow contributing progressively less relative to its face amount.
Why does a later cash flow contribute less to the total present value?
A later cash flow contributes less because it is discounted over more periods, so a larger portion of its face amount is removed by the discounting calculation. The $900 cash flow at period 3 in the example retains a smaller share of its face value than the $500 flow at period 1 does.
How is this related to net present value?
Net present value takes this same discounting calculation and subtracts an initial investment or cost from the total present value of future cash flows, to determine whether an investment is expected to exceed its required rate of return.
Should the same discount rate apply to every cash flow in a series?
Using a single discount rate for the whole series is the standard simplifying assumption this calculator makes, though in practice, cash flows with meaningfully different risk profiles within the same project might reasonably warrant different discount rates for a more precise valuation.
Summary
The Present Value of Cash Flows Calculator discounts a series of uneven future cash flows using Present Value = Sum of [CF(t) / (1 + i)^t].
Cash flows of $0, $500, $700 and $900 at periods 0 through 3, discounted at 8% per period, combine to a total present value of approximately $1,777.55, with later flows contributing proportionally less due to heavier discounting.
This is the same math behind net present value, focused purely on discounting the future cash flow series. Figures shown are estimates, not investment advice.