Payback Period Calculator

Calculate payback period from investment and annual cash flow — see years, months and discounted payback.

Payback Period Calculator

Calculate payback period from investment and annual cash flow — see years, months and discounted payback.

Initial investment($)

Annual cash flow($)

Discount rate (for discounted)(%)

Enter values above and click Calculate — results will appear here with the formula explained.

Simple payback = investment/cashflow; Discounted iterates NPV

How does this work?

Simple payback is investment divided by annual cash flow. Discounted payback discounts cash flows, taking longer.

Simple ignores time value; discounted is more accurate but longer.

For YMYL decisions, verify with authoritative sources (CFPB, IRS, WHO, or a licensed professional) and run conservative vs optimistic scenarios. This tool is educational, not professional advice — it assumes constant inputs and excludes fees, taxes and variability that affect real outcomes.

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Disclaimer: Results are estimates for informational purposes only and do not constitute professional financial advice. Consult a qualified professional for decisions.

What is Payback Period?

Simple payback is investment divided by annual cash flow. Discounted payback discounts cash flows, taking longer. Formula: Simple payback = investment/cashflow; Discounted iterates NPV

Quick Answer

Payback Period Calculator computes calculate payback period from investment and annual cash flow — see years, months and discounted payback. Formula: Simple payback = investment/cashflow. Example: With $50k investment, $15k/year: simple payback 3.

What it does: Calculate payback period from investment and annual cash flow — see years, months and discounted payback.
Formula: Simple payback = investment/cashflow; Discounted iterates NPV
Inputs: Initial investment ($) · Annual cash flow ($) · Discount rate (for discounted) (%)
Example: With $50k investment, $15k/year: simple payback 3.

Calculator Inputs at a Glance

Field	What to enter
Initial investment ($)	e.g. 50000
Annual cash flow ($)	e.g. 15000
Discount rate (for discounted) (%)	e.g. 8

All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.

How to Use This Calculator

1Enter initial investment, annual cash flow and discount rate.
2Calculate to see simple and discounted payback.
3Shorter payback is lower risk for accurate and reliable results in your calculation.

Formula Used

Simple payback = investment/cashflow; Discounted iterates NPV

Simple payback is investment divided by annual cash flow. Discounted payback discounts cash flows, taking longer.

Simple ignores time value; discounted is more accurate but longer.

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Worked Example

With $50k investment, $15k/year: simple payback 3.33 years (3y 4m). At 8% discounted, about 4y.

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Frequently Asked Questions

QWhat is good payback?

Shorter is better. 3-5 years is common for small projects.

QDiscounted vs simple?

Discounted accounts for time value, always longer.

QUneven flows?

This assumes even. For uneven, sum cumulatively until positive.

Quick Answer

What it does: Calculate payback period from investment and annual cash flow — see years, months and discounted payback.

Formula: Simple payback = investment/cashflow; Discounted iterates NPV

Inputs: Initial investment ($) · Annual cash flow ($) · Discount rate (for discounted) (%)

Example: With $50k investment, $15k/year: simple payback 3.

Field

What to enter

Initial investment ($)

e.g. 50000

Annual cash flow ($)

e.g. 15000

Discount rate (for discounted) (%)

e.g. 8

Formula Used

Simple payback = investment/cashflow; Discounted iterates NPV

Simple payback is investment divided by annual cash flow. Discounted payback discounts cash flows, taking longer.

Simple ignores time value; discounted is more accurate but longer.