Embed Free Financial & Calculation Tools
Provide your website visitors with interactive calculations. Copy and paste 1 line of HTML to embed bank-grade mortgage, loan, salary, and investment calculators.
100% Client-Side
Calculations execute locally in the user's browser. Zero server loads or rate limits.
Zero Ads or Tracking
Clean widgets focused on user experience. Seamless automatic light and dark mode.
1-Line Copy & Paste
Standard responsive iframe embeds compatible with WordPress, Ghost, Webflow, and React.
Most Popular Calculator Widgets
Ready to embedMortgage Calculator & Amortization Schedule
Free online mortgage calculator (2026). Calculate monthly PITI payments, compare 15-yr vs 30-yr fixed rates, model extra principal payoff savings, and export amortization schedules to Excel (.xlsx).
Auto & Car Loan Calculator
Calculate monthly car loan payments with trade-in value, dealer doc fees, sales tax, and interest. Download complete amortization schedules to Excel (.xlsx).
Salary & Take-Home Paycheck Calculator
Free online salary calculator. Calculate take-home pay after FICA, federal, 401(k), state taxes (US) and CTC, EPF, professional tax, and new regime income tax (India).
Retirement & 401(k) Nest Egg Calculator
Free online retirement and 401(k) calculator. Model compound accumulation, employer matching, inflation-adjusted future values, and safe withdrawal longevity.
Compound Interest Calculator
Free online compound interest calculator. Calculate exponential growth on investments and fixed deposits with customizable compounding frequencies.
Inflation & Purchasing Power Calculator
Free online inflation and purchasing power calculator (2026). Calculate future equivalent living costs, cumulative inflation percentages, and purchasing power erosion curves with Excel export.
SIP Calculator
Free online SIP calculator. Calculate the future maturity value of your monthly mutual fund investments, total invested amount, and wealth gained.
Percentage Calculator
Free online percentage calculator (2026). Calculate percentage of numbers, percent change, markups, discounts, and VAT instantly with step-by-step formula breakdown and Excel export.
Mortgages & Loans
Mortgage Calculator & Amortization Schedule
Free online mortgage calculator (2026). Calculate monthly PITI payments, compare 15-yr vs 30-yr fixed rates, model extra principal payoff savings, and export amortization schedules to Excel (.xlsx).
Auto & Car Loan Calculator
Calculate monthly car loan payments with trade-in value, dealer doc fees, sales tax, and interest. Download complete amortization schedules to Excel (.xlsx).
Debt Payoff & Credit Card Payoff Calculator
Free debt payoff and credit card payoff calculator. Compare Debt Avalanche vs Snowball methods, calculate interest savings, and export amortization schedules to Excel (.xlsx).
EMI Calculator
Free online EMI calculator (2026). Calculate monthly payments for $60k 72-month car loans, $175k-$900k mortgages, and RBI repo rate (5.50%) home loans with live amortization.
Salary & Paycheck
Salary & Take-Home Paycheck Calculator
Free online salary calculator. Calculate take-home pay after FICA, federal, 401(k), state taxes (US) and CTC, EPF, professional tax, and new regime income tax (India).
Income Tax Slab Calculator
Free online income tax calculator 2026. Calculate $100k after taxes in California vs Texas, 18 LPA in-hand salary under India's New Regime, and progressive bracket breakdowns with 100% privacy.
Hourly to Salary Calculator
Free online hourly to salary calculator. Convert hourly rate ($15, $20, $25, $30, $50/hr) into annual salary, monthly gross pay, and bi-weekly paychecks with Excel export.
Annual to Hourly Calculator
Free online annual to hourly calculator. Convert yearly salary ($50k, $75k, $100k, $150k) to hourly wage, monthly pay, and bi-weekly paychecks with instant Excel export.
UK Salary & Take-Home Pay Calculator
Free UK salary & take-home pay calculator (2024/25 & 2026/27). Compute HMRC PAYE income tax, 8% Class 1 National Insurance, Student Loan repayments (Plans 1, 2, 4, 5, PG), workplace pensions, and export your monthly payslip schedule to Excel.
Canada Paycheck & Salary Take-Home Calculator
Free Canada paycheck & salary take-home calculator (2024). Calculate CRA Federal and Provincial income taxes, CPP/CPP2 caps, EI statutory deductions, RRSP tax savings, and export bi-weekly pay stubs to Excel.
Australia Pay & Salary Take-Home Calculator
Free Australia pay & salary take-home calculator (2024-25 & 2026). Calculate ATO Stage 3 income tax cuts, 2% Medicare levy, 11.5% superannuation guarantee, HELP/HECS student debt repayments, and export fortnightly pay summaries to Excel.
Savings & Wealth
Compound Interest Calculator
Free online compound interest calculator. Calculate exponential growth on investments and fixed deposits with customizable compounding frequencies.
Retirement & 401(k) Nest Egg Calculator
Free online retirement and 401(k) calculator. Model compound accumulation, employer matching, inflation-adjusted future values, and safe withdrawal longevity.
High-Yield Savings & CD Calculator
Free High-Yield Savings (HYSA) and CD calculator. Calculate APY compounding growth, test early withdrawal penalties, and export amortization schedules to Excel (.xlsx).
Inflation & Purchasing Power Calculator
Free online inflation and purchasing power calculator (2026). Calculate future equivalent living costs, cumulative inflation percentages, and purchasing power erosion curves with Excel export.
SIP Calculator
Free online SIP calculator. Calculate the future maturity value of your monthly mutual fund investments, total invested amount, and wealth gained.
Return on Investment (ROI) Calculator
Free online ROI calculator. Calculate return on investment percentage, total net profit, and annualized ROI over any time horizon.
Data & Developer Tools
JSON Formatter & Validator
Free online JSON formatter and validator. Just paste the JSON or upload your file to pretty-print, detect syntax errors, and minify directly in your browser.
Base64 Encoder & Decoder
Free online Base64 encoder and decoder. Convert text, JSON, and binary data to and from Base64 instantly in your browser with zero server data retention.
JWT Token Inspector & Decoder
Free online JWT decoder. Safely decode and inspect JSON Web Token (JWT) header and payload claims in your browser with zero token transmission.
UUID / GUID v4 Batch Generator
Free online UUID / GUID v4 generator. Generate cryptographically secure random UUIDs in bulk with uppercase, lowercase, and hyphen toggles.
Client-Side Data Cleaner & PII Anonymizer
Free client-side data cleaner and PII anonymizer. Mask emails, phone numbers, credit card numbers, and SSNs in CSV/Excel files with zero cloud uploads.
Spreadsheet & File Diff Checker
Free online spreadsheet diff tool. Compare two CSV or Excel files cell-by-cell with visual color-coded changes and downloadable diff summary reports.
How to Embed on Any Platform
WordPress & Webflow
In your WordPress post editor or Webflow designer, add a Custom HTML / Embed block. Paste the iframe code snippet directly into the block and publish.
Ghost & Substack
In Ghost, insert an HTML card. The responsive widget dynamically adapts to your blog's content width and scales for mobile readers automatically.
React / Next.js / Astro
In modern web apps, render the iframe inside a responsive wrapper or React component with width="100%".
Frequently Asked Questions
Is embedding ConvertSheet widgets really 100% free?
Yes, completely free. There are no API keys, paywalls, or usage caps. You can embed our widgets on personal blogs, commercial portals, or educational sites without cost.
Do these widgets track my visitors or harvest financial data?
Never. Every calculation runs 100% in the client's browser memory using WebAssembly and JavaScript. No financial inputs, loan amounts, or salaries are transmitted to any server.
Can I customize the width and height of the embedded tool?
Yes. The iframe snippet is configured with width="100%" by default so it naturally fills whatever container you place it in. You can also specify an exact pixel width (such as 600px or 750px) to suit your layout.