Net Present Value (NPV) Calculator

Net present value (NPV) answers a question a raw profit total can't: is a series of future cash flows actually worth more than what you'd pay for them today? Money received later is worth less than the same amount received now — it could have been earning a return in the meantime — so NPV discounts every future cash flow back to today's terms before comparing it to the initial investment. This calculator takes an initial outlay, a discount rate, and up to 10 periods of cash flows, and computes NPV = -initial investment + Σ CF_t / (1+r)^t for t = 1 through N.

Each period's contribution is shown individually: the raw cash flow, its discount factor 1/(1+r)^t, and the resulting present value, all summed to the final NPV figure. The discount factor shrinks geometrically with time, which is exactly the point — a cash flow arriving in period 10 is discounted far more heavily than one arriving in period 1, even at a modest rate. Reading the per-period breakdown makes it obvious which periods are actually driving the result, rather than treating the NPV as an opaque single number.

The discount rate itself is often the least certain input in the whole calculation, so the calculator also recomputes the same formula at the entered rate minus 2%, minus 1%, the rate itself, plus 1% and plus 2% — a 5-row sensitivity table using no live data, just the same math applied five times. If the sign of the NPV flips somewhere in that narrow band, the investment's attractiveness is genuinely sensitive to an assumption you might not be confident in; if it stays firmly positive or negative across the whole range, the conclusion is more robust than the discount rate debate suggests.

A positive NPV means the discounted inflows exceed the initial investment — the project is value-adding at that discount rate — while a negative NPV means the opposite: value-destroying, because the same money invested elsewhere at the discount rate would have done better. NPV is widely preferred over simpler metrics like payback period precisely because it accounts for both the time value of money and everything that happens across the full cash-flow series, not just how quickly the initial cost is recovered.