Payback period calculator
Published On: 10/03/2026
Payback Period Calculator
Calculate how long it takes for an investment to recover its initial cost using future cash inflows. This calculator supports both even annual cash flow and custom yearly cash flows.
Inputs explained:
• Initial investment: the upfront cost at the start of the project.
• Cash inflows: the money the project generates over time.
• Even cash flow mode: use the same cash inflow each year.
• Custom cash flow mode: enter one cash inflow per year (comma or new line separated).
Payback period is the time required for cumulative cash inflows to equal the initial investment.
• Initial investment: the upfront cost at the start of the project.
• Cash inflows: the money the project generates over time.
• Even cash flow mode: use the same cash inflow each year.
• Custom cash flow mode: enter one cash inflow per year (comma or new line separated).
Payback period is the time required for cumulative cash inflows to equal the initial investment.
Payback Period Calculator — Description
The Payback Period Calculator measures how long it takes for an investment or project to recover its initial cost from future cash inflows. You can calculate payback using either a constant annual cash flow or a custom series of yearly cash flows. The calculator adds the cash inflows year by year until the initial investment is fully recovered, then estimates the exact fractional year if needed.
This tool is useful for capital budgeting, business investments, equipment purchases, and comparing projects based on how quickly they return the original investment.