What is the ROI formula?

Return on investment is ROI% = (final value − initial cost) ÷ initial cost × 100, and net profit is simply final value − initial cost. A $500 gain on a $1,000 cost is a 50% ROI; a $400 loss on a $2,000 cost is a −20% ROI.

What is annualized ROI (CAGR) and how is it different?

Plain ROI ignores how long you held the investment, so a 50% gain looks the same whether it took one year or ten. Annualized ROI, or compound annual growth rate, is the steady per-year rate that turns your cost into the final value: ((final value ÷ cost)^(1 ÷ years) − 1) × 100. A 50% total gain over 3 years is about 14.47% per year, which is far more comparable to a savings or index return.

Does this ROI calculator account for fees, taxes, or inflation?

No. It reports gross ROI and profit based only on the cost and final value you enter. It does not subtract trading fees, taxes, inflation, or opportunity cost, and it assumes the gain is fully realized. Treat the output as a quick estimate and verify your real net return with a licensed professional.

How should I attribute revenue to a marketing campaign?

For direct-response campaigns like paid search, use the sales or conversions your analytics platform has tagged to that campaign during its run. For longer or brand-driven campaigns, pick an attribution model — first-touch, last-touch, or weighted multi-touch — and apply the same model to every campaign you compare. Only put revenue in the return box that you can credibly defend in a budget review.

Can the same ROI formula work for both short-term and long-term marketing campaigns?

Yes — the plain ROI formula works for any campaign regardless of length. For campaigns under a year, plain ROI plus a stated time window is usually the clearer report. For longer campaigns, add a holding period in years to the calculator to get an annualized ROI (CAGR) that can be lined up against benchmark returns. Avoid annualizing campaigns that ran for only a few weeks; the figure becomes mathematically extreme and stops being useful for comparison.

How to Calculate ROI for Marketing Campaigns

Marketing ROI: What the Number Actually Tells You

Marketing ROI is calculated with the same formula used for any other investment: ROI% = (return − cost) ÷ cost × 100, with net profit reported as return minus cost. To apply it to a campaign, you treat the total amount you spent on the campaign as the cost and the revenue you can actually tie back to that campaign as the return. A campaign that cost $5,000 and produced $8,000 in attributed sales, for example, returns $3,000 in profit on a 60% ROI. The percentage is what lets you line a Google Ads push against a content marketing push against an influencer deal on the same yardstick, because it normalizes the gain against what you put in. ROI is the most widely used comparison metric for exactly this reason — $500 in profit looks very different on a $1,000 spend than it does on a $10,000 one. The ROI Calculator applies that same formula, plus an optional annualized figure, so you can do the math in your browser without typing the equation by hand.

The output of the calculation is a single percentage and a single dollar figure. Both update the moment you change an input, so you can flip between scenarios quickly: spend $2,000 instead of $5,000, swap $8,000 of revenue for $12,000, and the new number appears in the same place. Nothing you type is uploaded — the calculation runs locally — which matters when the figures you are testing come from a real customer list or a still-private campaign report.

How to Calculate Marketing ROI in Three Steps

Enter the initial cost — the total amount you spent on the campaign, in dollars. Include ad spend, creative production, platform fees, agency fees, and any other direct costs you want factored in. The number you type becomes the denominator of the ROI formula, so leaving something out will make your return look bigger than it really is.
Enter the final value — the revenue (or other measurable return) you can tie back to the campaign. For a short campaign this might be the sales recorded during the run; for a longer campaign it might be the first-year revenue from leads generated during the run. If the campaign has not finished generating returns yet, use whatever figure you can stand behind today and rerun the calculation as more revenue lands.
Read the ROI percentage and net profit instantly; optionally add a holding period in years to also see the annualized ROI (CAGR). The result is recomputed in your browser as soon as you change either input, and you can adjust either figure to model "what if" scenarios without redoing the math.

What Counts as "Cost" and "Return" in a Marketing Campaign

The biggest source of bad marketing ROI numbers is not bad arithmetic — it is sloppy definitions of what goes in each box. The cost side is whatever you actually paid out to run the campaign: media spend, creative production, talent or agency fees, software subscriptions you bought specifically for it, and a fair share of staff time if you want a fully loaded number. The return side is whatever dollar value you can credibly attribute to the campaign. That attribution is the hard part, and it is also the part that decides whether your ROI is real.

For a direct-response channel like paid search or a single email blast, attribution is usually straightforward: revenue from conversions tagged to that campaign in the same window. For a brand campaign or a content play, attribution can stretch over weeks or months, and you may need to use a model — first-touch, last-touch, or a weighted multi-touch model — to assign a share of closed deals back to the campaign. Whatever model you choose, be consistent across campaigns. The ROI Calculator cannot tell you which attribution model to pick; it can only apply the numbers you give it honestly.

A useful test: if you would not be comfortable defending the revenue figure in a budget meeting, do not put it in the return box. A 200% ROI on paper is not worth anything if the underlying revenue was assumed rather than measured.

Marketing ROI at a Glance by Channel

Different channels need different definitions of cost and return, and they tend to evaluate over very different time windows. The table below describes the relationship between cost, return, and evaluation horizon for common channels; the exact figures for any specific campaign should come from the ROI Calculator with your own numbers.

Channel	What goes into cost	What goes into return	Typical evaluation window
Paid search (PPC)	Click costs, agency or in-house management time	Sales directly attributed to ad clicks	Days to a few weeks
Social ads	Media spend, creative production, platform fees	Attributed conversions and assisted conversions	Days to weeks
Content marketing	Writer or freelancer fees, design, promotion spend	Leads, organic traffic, attributed closed deals	Months to years
Email campaigns	Platform subscription, creative time	Sales from email-driven conversions	Days to weeks
Influencer marketing	Creator fee, gifted product, whitelisting fees	Engagement value plus attributed sales	Days to months
SEO investment	In-house or agency retainers, tooling	Organic conversions and lifetime value of acquired users	Months to years

When Annualized ROI Matters for a Marketing Campaign

Plain ROI ignores time, and that is a real problem when you are comparing campaigns that ran for very different lengths. A campaign that returned 60% in six weeks looks impressive next to a campaign that returned 80% in two years, but they are not even close to equivalent on a per-year basis. The fix is to add a holding period to the ROI Calculator so it also reports the compound annual growth rate (CAGR) — the steady yearly return that would turn your cost into your final value over the years you entered. The formula is ((final value ÷ cost)^(1 ÷ years) − 1) × 100.

A worked example: suppose you spent $5,000 on a content marketing push, and over the following two years it generated $15,000 in attributable revenue. The plain ROI is (15,000 − 5,000) ÷ 5,000 × 100 = 200%, and the net profit is $10,000. The annualized ROI is ((15,000 ÷ 5,000)^(1 ÷ 2) − 1) × 100 ≈ 73.2% per year — still strong, but a much more honest number when you compare it to a savings rate or an index benchmark.

For very short campaigns, annualized ROI gets extreme and stops being useful. A campaign that runs for two weeks and returns 30% would annualize to several thousand percent, which is mathematically correct but not a meaningful comparison. For campaigns under a year, plain ROI and a stated time window is usually the clearer report.

What the Marketing ROI Formula Leaves Out

The ROI Calculator reports gross ROI and net profit based only on the cost and final value you enter. It does not subtract platform or payment processing fees, taxes, the opportunity cost of the cash you tied up, or inflation. It also treats the gain as fully realized, so a campaign that booked $15,000 in sales today and will not actually collect that cash for 90 days still reports the full $15,000 as return. For a quick read on whether a campaign made money, that is fine. For a financial decision, you should adjust the inputs to net out anything material that the basic formula ignores.

There are also a couple of hard limits to know. The initial cost must be greater than zero — it is the denominator of the formula — and the calculator rejects an entry that breaks this rule rather than returning a meaningless number. For annualized ROI, the final value must be greater than zero and the holding period must be greater than zero, because the formula needs to take a fractional root of the ratio. Plain ROI does permit a final value at or below the cost, which is how losses show up as a negative percentage: a $2,000 spend that ends at $1,600 is a −20% ROI and a $400 loss.

If your marketing investment involves regular deposits over time — a monthly SEO retainer, for example, or a slow-build ad budget — the basic ROI formula will not capture the time-weighted nature of those contributions. For that kind of cash flow, a compound interest calculator is a better starting point. For a one-shot spend with a clear revenue outcome, the ROI Calculator gives you the answer in the form most marketers actually use to compare campaigns.