What this calculadora actually does

Most Business tools bury the calculation. ROI calculadora shows it. Punch in your figures, read the working, share the URL if you need a second opinion.

Rules of thumb lie at scale — the arithmetic holds up to a whiteboard argument. Decide whether you want gross or net, and commit — then model the numbers and the rest of this page explains what the answer means.

Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views.

Following the method end to end

Here's what happens when you plug real numbers in.

Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views.

Scenarios where ROI calculadora pays off

ROI calculadora is aimed at people arriving with questions like these:

"ROI formula"
"Marketing ROI"
"Annualised ROI"
"What is roi"
"How to calculate roi"
"Roi formula"

When it isn't the right tool

Every tool has an edge where it stops being the right answer. ROI calculadora is no exception:

For legally binding tax or medical decisions — cross-check with HMRC, NHS or a qualified professional.
For very large or very small extremes the rounding error outgrows the useful precision.
When the underlying rate or threshold has changed since the page was last reviewed — always verify with the primary source.
When the input you have is already a derived figure (net of something) — feeding it in as "gross" will double-subtract.

Mistakes we see over and over

Every time you model the numbers for a new scenario, one of these creeps in — it's worth knowing them ahead of time.

Mixing up units — grams in one field, ounces in another, then wondering why the answer is off.
Treating a percentage as a whole number. 20% means 0.20 in the maths, not 20.
Rounding at every step. Keep four decimals internally and only round the final number.
Using last year's thresholds. If the page isn't dated, assume it's stale and check GOV.UK.
Reading a tool like this as advice. It is maths, not a decision — the decision is still yours.

The sources behind the numbers

Where the maths needs an external authority, we cross-check against:

Harvard Business Review
Sebrae

Works well alongside

If this question keeps coming up for you, the same cluster of tools usually comes next:

Break-Even calculadora — Work out how many units or how much revenue covers fixed and variable costs for a product or service.
Payback Period calculadora — Compute simple and discounted payback period in months from upfront cost and recurring cash flows.
Gross Margin calculadora — Work out gross margin and gross-margin percentage from revenue and COGS, with category benchmarks for SaaS, retail and services.

How we keep this accurate

Our calculadoras run on pure, unit-tested functions — the same logic lives in the browser and in the CI test suite. When tax rates, thresholds or official figures move, the update lands within 24 hours of the announcement. You can read the editorial policy and corrections policy.

Found an out-of-date number on ROI calculadora or anywhere else in the Business toolkit? Send it to the editorial desk and we'll patch it. Or browse the full calculadora directory for the next tool you need.

Frequently asked questions

ROI formula?

Practically speaking, feed the figures into the ROI calculadora widget and it'll show the working. Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views.

Marketing ROI?

Here's the plain-English summary: open the ROI calculadora widget at the top of the page. Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views.

Annualised ROI?

In one line: this question usually arrives alongside Break-Even calculadora, Payback Period calculadora, Gross Margin calculadora. The ROI calculadora handles the specific case above; the others cover adjacent ground.

What is roi?

Put simply, every figure is cross-checked against Harvard Business Review and the wider data. If you notice a stale rate, email the editorial desk and we'll patch it in under 24 hours.

How to calculate roi?

Short answer: yes, everything runs in your browser. No inputs are sent to our servers or any third party, nothing is logged and nothing persists after you close the tab.

Roi formula?

Quick version: ROI calculadora is free to use, free to share and free to embed — pass the URL around a class, a slack channel or a family chat. The editorial policy covers attribution.

Roi example?

Practically speaking, the short method: write the inputs in the units shown, run the calculation, then sense-check the answer against an order-of-magnitude estimate in your head.

Roi worked example?

Here's the plain-English summary: if the result surprises you, run it a second time with slightly different inputs — small swings often reveal a unit or rounding issue in the original figures.

Roi explained?

In one line: a calculadora is a sanity check, not a verdict. For anything legally binding — contracts, tax filings, medical decisions — bring the figure to a qualified professional as a starting point.

Roi definition?

Put simply, Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views. The page walks through the method in full so you can answer follow-up questions without guessing.

Roi meaning?

Short answer: open the ROI calculadora widget at the top of the page. Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views.

Roi step by step?

Quick version: open the ROI calculadora widget at the top of the page. Work out ROI on any project, campaign or investment — net return divided by cost, with annualised and cumulative views.

How it works