Return calculator
ROI Calculator
Calculate ROI, annualized ROI, ROAS, and net gain or loss for investments and ecommerce campaigns.
Calculator setup
Enter values on the left; results update instantly.
Calculation result
Fill in the inputs to see results here.
Scrape hundreds of webpages in one click with the Thunderbit Chrome Extension. Prefer to hand this job to AI? Use the Thunderbit API or Thunderbit MCP. Want us to run it for you? Use our Web Scraping Service.
Scrape ROI Inputs from Any SiteUse Thunderbit to automate data collection from websites and files, then extract structured fields fast for analysis and reporting.
Install fromChrome Web Store
Scrape ROI Inputs from Any Site
Collect investment inputs from websites, subpages, PDFs, docs, and images with Thunderbit’s AI Web Scraper Chrome extension. Use AI Suggest Fields to extract structured numbers and notes, then summarize, categorize, and format the results into a clean table.
Scrape listings with pagination, enrich rows with subpage scraping, and keep datasets consistent even when layouts change. Export your structured ROI research to Google Sheets, Airtable, or Notion for sharing and ongoing tracking.
How to Calculate ROI Using Thunderbit
STEP 1Download and InstallDownload and install the Thunderbit Chrome Extension from the Thunderbit Chrome Extension Download Page. Once installed, log in or create a free account to get started.
STEP 2Open ExtensionOpen the Thunderbit Chrome Extension, then go to the ROI Calculator. In the "Calculate ROI" tab, enter your numbers in the input fields: (1) "initial_investment" for the initial investment amount, (2) "net_profit" for the net profit or loss (use a negative number for a loss), and (3) choose "yes" or "no" in "include_interpretation" to control whether the result includes a short positive, negative, or break-even note.
STEP 3Click the Calculate ROI ButtonClick the "Calculate ROI" button to generate the result. Thunderbit will validate that both inputs are numeric, then compute ROI% = (net_profit / initial_investment) * 100 and round it to 2 decimal places. Review the plain-text output (it will always include "ROI: X%" and may include a short interpretation if you selected "yes"), then copy the result to your document, spreadsheet, or notes as needed.
Learn how to calculate ROI for any investment
Calculate ROI from two inputs
Enter an initial investment amount and the net profit or loss to compute return on investment as a percentage. The ROI Calculator applies a standard formula and returns a clear ROI% figure you can use to evaluate performance. It is built for founders, finance teams, marketers, and operators who need a quick way to compare projects, campaigns, or purchases without building spreadsheets.
Validate inputs and handle edge cases
The tool checks that both values are numeric and prevents misleading results by flagging cases where the initial investment is zero. It also supports negative net profit to reflect losses, so you can assess downside outcomes as well as wins. This helps analysts and project owners avoid calculation errors and keep ROI reporting consistent across different initiatives.
Compare investment options and prioritize budgets
Use the ROI Calculator to compare multiple opportunities using the same metric, such as marketing channels, software subscriptions, hiring plans, or inventory buys. By standardizing ROI%, teams can rank initiatives, justify budget allocation, and document decision logic. It is especially useful during planning cycles when you need quick, repeatable calculations for many scenarios.
Summarize results for reporting and reviews
Generate a concise plain-text result that includes the ROI percentage, plus an optional interpretation that labels the outcome as positive, negative, or break-even. This format is easy to paste into emails, docs, tickets, or spreadsheets for stakeholder updates and post-project reviews. It supports consistent communication when sharing outcomes across teams and leadership.
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What users say about Thunderbit
Taryn W.Growth Strategist@Thunderbit changed how I run competitor research. I click 'AI Suggest Fields,' and it builds a clean table across paginated results—no coding, no CSS. Huge time-saver when analyzing product data from long-tail marketplaces.
Miles T.Sales Development ConsultantI use Thunderbit to grab emails and phone numbers from directories. It extracts clean contact info in one click, and exporting to Sheets or Notion takes seconds. No extra setup, no coding—just usable data ready to work with.
Rhea C.E-commerce AnalystThunderbit helps me monitor SKU data across multiple pages. I scrape the listings, then use Subpage Scraping to pull full product specs, pricing, reviews, and stock. The AI organizes everything into columns I define.
Cassian B.Real Estate AdvisorThunderbit's Scheduled Scraper makes real estate tracking easier. I describe the interval in plain English, and it automatically pulls updated listings, prices, and links without touching the setup again. Simple and very practical.
Dorian B.Content & SEO SpecialistI use Thunderbit's Field AI Prompts to clean and tag scraped blog content. It extracts titles, authors, and even suggests categories. Works great across dynamic sites and subpages—perfect for building structured SEO datasets.
Lina K.Marketplace Operations LeadWe track SKUs from niche stores using Thunderbit. Cloud Scraping handles 50 pages at a time, and for login-required sites, we switch to browser mode. It’s fast, flexible, and doesn’t need ongoing maintenance or manual edits.
Jorge F.Inbound Sales ManagerThunderbit’s AI Autofill is a lifesaver. After scraping contact info, I use it to fill lead forms directly in my browser. I just select the tab, and it fills everything using the scraped row. No manual input needed.
Alina D.Freelance ResearcherI rely on Thunderbit for extracting data from PDFs, image-based sites, and infinite scroll pages. It handles messy formats with AI and delivers ready-to-export tables I can send to Google Sheets or Airtable in seconds.
Taryn W.Growth Strategist@Thunderbit changed how I run competitor research. I click 'AI Suggest Fields,' and it builds a clean table across paginated results—no coding, no CSS. Huge time-saver when analyzing product data from long-tail marketplaces.
Miles T.Sales Development ConsultantI use Thunderbit to grab emails and phone numbers from directories. It extracts clean contact info in one click, and exporting to Sheets or Notion takes seconds. No extra setup, no coding—just usable data ready to work with.
Rhea C.E-commerce AnalystThunderbit helps me monitor SKU data across multiple pages. I scrape the listings, then use Subpage Scraping to pull full product specs, pricing, reviews, and stock. The AI organizes everything into columns I define.
Cassian B.Real Estate AdvisorThunderbit's Scheduled Scraper makes real estate tracking easier. I describe the interval in plain English, and it automatically pulls updated listings, prices, and links without touching the setup again. Simple and very practical.
Dorian B.Content & SEO SpecialistI use Thunderbit's Field AI Prompts to clean and tag scraped blog content. It extracts titles, authors, and even suggests categories. Works great across dynamic sites and subpages—perfect for building structured SEO datasets.
Lina K.Marketplace Operations LeadWe track SKUs from niche stores using Thunderbit. Cloud Scraping handles 50 pages at a time, and for login-required sites, we switch to browser mode. It’s fast, flexible, and doesn’t need ongoing maintenance or manual edits.
Jorge F.Inbound Sales ManagerThunderbit’s AI Autofill is a lifesaver. After scraping contact info, I use it to fill lead forms directly in my browser. I just select the tab, and it fills everything using the scraped row. No manual input needed.
Alina D.Freelance ResearcherI rely on Thunderbit for extracting data from PDFs, image-based sites, and infinite scroll pages. It handles messy formats with AI and delivers ready-to-export tables I can send to Google Sheets or Airtable in seconds.
