Ecommerce tool

ROI Calculator

Measure return on investment as a percentage from gain and cost.

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Instant useNo sign up, quick result.

Practical outputBuilt for real everyday checks.

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What this tool helps with

Calculate return on investment from gain and cost using a free ROI calculator.

Quick start

Enter your values, review the result and use the guide block below for a clearer explanation, example and related tools.

Gain (£)

Cost (£)

ROI

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Guide

How ROI is calculated

ROI compares the gain from an investment against the cost of that investment. It is useful for ad campaigns, product launches, software purchases and other business decisions.

Example

Example use case

If a campaign returns £1,000 from a £500 cost, ROI is 100%.

Frequently asked questions

What does a positive ROI mean?

It means the return is greater than the cost.

Can I use revenue instead of profit?

For a cleaner ROI estimate, use net gain rather than total revenue.

Why is ROI useful?

It helps compare whether time or money spent is producing value.

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