Curated list · 6 picks

Best calculator Chrome extensions

Everyday calculators that open from the toolbar: age, BMI, loan EMI, budgets, units and ROI.

Latest change to a listed extension: Apr 24, 2026

  1. 1

    Loan EMI Calculator

    Work out monthly EMI and total interest.

    Calculate monthly loan EMIs with a full interest and principal breakdown. View complete repayment schedules to plan your finances and compare different loan options.

    Calculators & FinanceFree4.6 out of 5, editor score
    DetailsAdd to Chrome (opens Chrome Web Store)
  2. 2

    Budget Planner Pro

    Plan monthly income, spending and savings.

    Track daily expenses, set savings goals, and generate detailed financial reports. A complete personal finance manager that helps you stay on budget every month.

    Calculators & FinanceFree5.0 out of 5, editor score
    DetailsAdd to Chrome (opens Chrome Web Store)
  3. 3

    Age Calculator

    Exact age in years, months and days.

    Calculate your exact age instantly with accurate results in years, months, and days. Simple, fast, and offline tool for quick age calculations directly in your browser.

    Calculators & FinanceFree4.7 out of 5, editor score
    DetailsAdd to Chrome (opens Chrome Web Store)
  4. 4

    BMI Calculator

    Body mass index with the standard ranges.

    Calculate your BMI instantly and track your health status with accurate insights. Simple, fast, and offline tool with modern interface, ideal weight range, and calorie estimation.

    Calculators & FinanceFree4.8 out of 5, editor score
    DetailsAdd to Chrome (opens Chrome Web Store)
  5. 5

    ConvertAll

    A scientific calculator and unit converter in one.

    Scientific calculator and unit converter in one tool. Convert measurements instantly with real-time results using a fast, lightweight, and offline solution directly in your browser.

    Calculators & FinanceFree4.8 out of 5, editor score
    DetailsAdd to Chrome (opens Chrome Web Store)
  6. 6

    Feature ROI Pro

    Estimate the return on a product feature.

    AI-powered ROI Calculator to estimate returns instantly with advanced analytics and scenario modeling. Fast, simple, and privacy-focused tool for quick financial insights directly in your browser.

    Calculators & FinanceFree4.9 out of 5, editor score
    DetailsAdd to Chrome (opens Chrome Web Store)

About this list

What is the best calculators Chrome extension?

Our top pick is Loan EMI Calculator: Work out monthly EMI and total interest. The rest of the list is ranked by how often our editors reach for each one.

How was this list chosen?

AltFTool editors picked and ordered these from the extensions we publish, based on what each one does and how polished it is. It is not based on paid placement or user review counts.

Are the extensions on this list free?

Yes. Every extension here is free to install from the Chrome Web Store and needs no AltFTool account.

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