Business ROI Calculator

Annualised, and with a present value beside it.

Annualised, and with a present value beside it. Quoting total ROI without the period is how modest investments get presented as exceptional ones.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Currency

Investment

Annual net return

Years

Discount rate

Total ROI

10%

3.2% annualised

Total return$66,000

Net gain$6,000

Annualised return3.2%

Net present value−$7,160

Total ROI over 3.0 years is 10%, which annualises to 3.2%. Quoting the total without the period is how modest investments get presented as exceptional ones.

How the Business ROI Calculator works

Quoting total ROI without the period is how modest investments get presented as exceptional ones. A 60% return over three years annualises to under 17%, which is a different conversation entirely.

Also known as: return on business investment · project ROI calculator · investment return for business

Defining the return before spending the money

Return on investment is gain minus cost, divided by cost. The arithmetic is trivial and the difficulty is entirely in defining what counts as gain and over what period.

Gain should be incremental contribution rather than revenue. A £10,000 investment producing £30,000 of additional revenue at a 30% contribution margin produced £9,000 of gain, not £30,000, and the ROI is minus 10% rather than 200%.

That error is common enough to be worth stating plainly. Marketing investments in particular are routinely evaluated on revenue, which makes every campaign look successful and explains why businesses can hit revenue targets while losing money.

Time, and why simple ROI ignores it

Simple ROI has no time dimension, so a 40% return over one year and a 40% return over four years look identical. They are not.

Annualising fixes the comparison: a 40% return over four years is roughly 8.8% a year, which is a completely different proposition. Any comparison between investments with different durations has to be annualised or it is not a comparison.

For anything longer than about a year, discounting matters as well. Money returned in year three is worth less than money returned now, and net present value handles that where ROI does not. For most small business decisions the simpler annualised figure is adequate; for a warehouse or an acquisition it is not.

The costs people leave out

Time is the largest and the most consistently omitted. An investment requiring 200 hours of the founder's attention has a real cost, whether or not anyone invoiced for it, and the opportunity cost of what those hours would otherwise have produced is often larger than the cash outlay.

Then the ongoing costs. Software bought once needs configuring, maintaining and eventually replacing. Equipment needs servicing. A hire needs managing. Evaluating a purchase on its purchase price understates it by whatever the running cost turns out to be.

And the cost of failure. An investment with a 60% chance of the projected return and a 40% chance of nothing has an expected return well below the projection, and treating the projection as the expected value is how portfolios of individually sensible decisions produce disappointing aggregate results.

Comparing against the alternatives

An investment has to beat what else the money could do, not merely produce a positive number. For most small businesses the relevant alternatives are: buy more stock of a proven line, spend more on advertising that is currently working, repay debt, or hold cash.

Repaying debt is the benchmark most often ignored and it is a risk-free return equal to the interest rate. An investment projected at 14% is not obviously better than repaying a facility at 12%, once the risk difference is counted.

Holding cash is a genuine alternative in an uncertain period and it has an option value that never appears in an ROI calculation. Businesses that invested everything in early 2020 and businesses that held cash had very different years, and neither decision was wrong on the numbers available beforehand.

Checking afterwards

The step almost universally skipped is comparing the realised return against the projected one. Without it, the estimating process never improves, and businesses continue to over-forecast in the same direction indefinitely.

The mechanism that works is simple: record the projection when the decision is made, with the date it should be evaluated, and evaluate it then. A shared document with a row per investment is sufficient.

What emerges after a year or two is a bias, and it is nearly always optimistic. Knowing that your projections run 40% high is more useful than any individual calculation, because it can be applied to every future decision as a correction. That is the actual value of tracking ROI, and it only appears if the checking happens.

Where to go next

The Business ROI question rarely arrives on its own. These are the ones that usually come with it:

Payback Period Calculator — A cash constraint, not a ranking method.
Profit Reinvestment Calculator — Tax comes out before reinvestment.
Break-Even Timeline Calculator — Two break-evens, months apart.
Etsy Fee Calculator — Every Etsy fee on one sale, itemised.

Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price, check the platform's current fee schedule before you price a product against it. This is not tax or business advice.

Frequently asked questions

How is ROI calculated?

Net gain divided by investment. Annualising it, taking the nth root over n years; is what makes returns comparable across different time periods.

What is net present value?

Future returns discounted back to today at your cost of capital, less the investment. A positive NPV means the project beats the alternative use of the money.

Which should I use?

NPV for deciding whether to proceed, annualised ROI for comparing options, payback period for checking you can survive the wait. They answer different questions.

What discount rate is appropriate?

Your cost of capital, or the return available on the next best use of the money. For a small business that is often the return the business itself generates.