ROI Calculator – Complete Guide & Free Online Tool

An ROI calculator measures the return on an investment: ROI = (returned − invested) / invested × 100. Free online tool included.

Published 2026-09-13

In this guide
  1. What is ROI Calculator?
  2. Formula
  3. Key Features
  4. Examples
  5. Common Use Cases
  6. Tips & Best Practices
  7. Limitations
  8. Related Tools
  9. External Resources

What is ROI Calculator?

An ROI calculator measures the return on an investment: ROI = (returned − invested) / invested × 100.

Formula

ROI = ((returned − invested) / invested) × 100. A positive ROI means you made a profit; a negative one means a loss.

Key Features

• Net profit • ROI percentage • Instant results

Examples

• Invest $1 • 000 and receive $1 • 500 → net $500 • ROI 50%.

Common Use Cases

• Marketing campaigns • Investments • Business decisions

Tips & Best Practices

• Account for all costs to avoid overstating ROI.

Limitations

• Simple ROI ignores time; use annualized ROI for comparisons across periods.

Related Tools

Explore other calculators: [Calculators](/categories/calculators).

Related tools: [profit-margin](/tools/profit-margin), [compound-interest](/tools/compound-interest), [percentage-change](/tools/percentage-change).

External Resources

Investopedia: ROI

Related Tools

Profit Margin Calculator Calculate profit and profit margin from revenue and cost. Calculators Use Tool →
Compound Interest Calculator Calculate compound interest with configurable compounding frequency. Calculators Use Tool →
Percentage Change Calculator Calculate the percentage increase or decrease between two values. Calculators Use Tool →

Frequently Asked Questions

What is ROI?
Return on Investment: profit relative to the amount invested.
How is ROI calculated?
((returned − invested) / invested) × 100.
Is it free?
Yes, and it runs locally.

More Guides

Word Counter – Complete Guide & Free Online Tool A word counter counts the number of words in a text instantly. It also shows characters (with and without spaces), sentences, paragraphs, and an estimated reading time, all processed locally in your browser. Free online tool included. Read → Character Counter – Complete Guide & Free Online Tool A character counter reports how many characters your text contains, both with and without spaces. It also shows the word count, which is useful for social media, meta descriptions and forms with length limits. Free online tool included. Read → Sentence Counter – Complete Guide & Free Online Tool A sentence counter counts how many sentences your text contains and the total words, then works out the average words per sentence — a useful readability signal. Free online tool included. Read → Reading Time Calculator – Complete Guide & Free Online Tool A reading time calculator estimates how long it takes to read your text by dividing the word count by a reading speed, typically 200–250 words per minute. It is widely used to display "X min read" on blogs. Free online tool included. Read →