This payback period calculator answers the oldest question in investing: when do I get my money back? — computing both the simple payback and the discounted payback that prices in the time value of money.
Two Paybacks, Two Philosophies
Simple: cost ÷ annual inflow — fast, intuitive, and blind to both timing and everything after break-even. Discounted: the same race, but each year's inflow is first deflated by your discount rate (a dollar in year 5 is worth 68¢ at 8%). Discounted payback is always ≥ simple, and can be never — the maximum PV of a perpetual stream is CF/r. The whole-stream valuations are our NPV Calculator and IRR Calculator; business-level break-even lives on the Break-Even Calculator. Part of our Finance Calculators collection.
Worked Example (Verified)
- $10,000 investment, $2,500/year (defaults): simple payback = 10,000 ÷ 2,500 = 4.00 years
- Discounted at 8%: cumulative PVs run 2,314.8 · 4,458.1 · 6,442.7 · 8,280.3 · 9,981.8 · 11,557.2 — crossing $10,000 just inside year 6 → 5.01 years
- The 1.01-year gap at 8% is the time value of money made visible — and it widens brutally with rate: at 20%, the same stream's discounted payback is ≈ 7.3 years, against a perpetuity ceiling of $12,500
- Uneven inflows? The method generalizes year-by-year (that's exactly the loop inside this widget's discounted engine) — spreadsheet the cumulative column and find the crossing
What Payback Can't See
- Everything after the crossing: a project returning $2,500 for 5 years and one returning it for 30 share a payback — NPV differs by ~5×.
- Profitability itself: payback measures liquidity/risk exposure time, not wealth creation. Short payback + negative NPV is possible and common in sales decks.
- Risk shape: two projects with equal paybacks can carry wildly different failure modes in year 1.
- Use it as a screening gate ("nothing over 5 years"), then let NPV/IRR judge the survivors — the order professionals actually apply it in.
Related Tools
- NPV Calculator — the whole stream's worth today
- IRR Calculator — the stream's own rate of return
- Finance Calculators — the full collection
Frequently Asked Questions
How do you calculate the payback period?
For steady inflows: initial cost ÷ annual cash inflow — $10,000 ÷ $2,500 = 4.0 years. For uneven flows, accumulate year by year until the cumulative total covers the cost, interpolating within the crossing year.
What is discounted payback?
The same calculation with each inflow first discounted to present value at your hurdle rate. At 8%, the worked example's discounted payback is 5.01 years versus 4.00 simple — and if the rate is high enough relative to inflows, discounted payback never happens even though simple payback does.
What is a good payback period?
Context rules: corporate hurdle policies often demand 3–5 years; solar installations celebrate 6–8; software equipment 2–3. The right benchmark is your opportunity cost and risk tolerance, not a universal number — but longer payback always means longer exposure before the investment "de-risks."
Payback or NPV — which should decide?
NPV for the decision (it counts everything, time-adjusted); payback for the risk screen (how long is capital exposed). Deciding on payback alone accepts projects that break even and then die over projects that pay back slowly and then print money for decades.
Does payback account for salvage value?
Classically no — a flaw worth patching when salvage is material: add the expected (discounted, for the discounted variant) salvage to the final year's inflow. Equipment-heavy projects change verdicts when you do.
Is this payback period calculator free?
Yes — free, instant, no sign-up.