For Website Owners & Developers
Embed Free Financial Calculators on Your Site
Every one of our calculators can be dropped into your own blog post, real estate listing, financial-advice site, or app with a single iframe — free, with no sign-up and no API key. Real estate agents, personal finance bloggers, and mortgage brokers use these to give readers a working tool instead of a static article.
See It Live
This is exactly what visitors to your site would see — the real, live 30-Year Fixed Mortgage Calculator embedded below with the standard attribution link underneath.
How to Embed a Calculator
Find a calculator
Browse by category below, or use calculators.json to find the exact one that matches your content.
Click "Embed This Calculator"
Every calculator page has an embed button below the results. It generates the iframe code and lets you pick a width and height.
Paste it into your page
Drop the snippet into your CMS's HTML block. The calculator renders live, fully functional, and keeps working even if you never touch it again.
Popular Widgets to Embed
30-Year Fixed Mortgage Calculator
Calculate your 30-year fixed mortgage payment, total interest, and see the full amortization schedule. Free calculator with no sign-up required.
Compound Interest Calculator
Calculate how your money grows with compound interest. See future value with monthly contributions, different compounding frequencies, and year-by-year growth.
Texas Paycheck Calculator
Calculate your net paycheck in Texas with no state income tax. See federal tax, state tax, Social Security, Medicare, and take-home pay.
BMI Calculator
Calculate your Body Mass Index (BMI) and find your healthy weight range. Free BMI calculator for adults using height and weight.
Lease vs. Buy Car Calculator
Free lease vs. buy car calculator. Compare the true net cost of leasing (money factor, residual value, fees) against financing a purchase (loan payments, equity) over the same time period.
California Property Tax Calculator
California property tax under Proposition 13: 1% of assessed value plus your area's voter-approved debt rates, with yearly growth capped at 2% and a $7,000 homeowners' exemption.
Debt Payoff Calculator
Create a debt-free plan. Calculate payoff timeline and interest savings using snowball or avalanche method. See how extra payments accelerate your progress.
Zakat Calculator
Free Zakat calculator. Calculate your Zakat obligation on cash, gold, silver, stocks, business assets, rental income, and cryptocurrency.
Browse All 75 Categories
Every calculator in every category below can be embedded the same way — open its page and click "Embed This Calculator."
Building Something Programmatic?
If an iframe doesn't fit your use case, calculators.json is a public, crawlable JSON index of every calculator (slug, category, URL, description) intended for developers and AI/LLM tooling. There's also a companion states.json with the underlying per-state data. Both are free to use with attribution; see the license note in each file.
Have a use case those don't cover? Tell us — it directly shapes what we build next.
Frequently Asked Questions
Is embedding a StateCalc calculator really free?
Yes. Every calculator on StateCalc can be embedded via iframe at no cost, with no account, no API key, and no usage limits. The only requirement is keeping the small "Powered by StateCalc" attribution link that ships in the embed code, so readers know where the calculation logic and data come from.
How do I get the embed code?
Open any calculator page and click the "Embed This Calculator" button below the results panel. It generates a ready-to-paste <iframe> snippet, lets you adjust width and height, and includes a live preview — no manual URL construction needed.
Will the embedded calculator stay accurate and up to date?
Yes — the iframe always loads the live calculator page from statecalc.com, so tax brackets, rate tables, and formulas update automatically whenever we refresh our data. You never need to re-copy the embed code.
Can I customize the size or remove the site navigation?
Yes. Embed URLs use a ?embed=true parameter that strips the header, footer, and ads so only the calculator itself renders — ideal for a clean fit inside your own page layout. Width and height are plain iframe attributes you can adjust freely.
Is there a machine-readable index of every calculator?
Yes — statecalc.com/calculators.json lists every calculator with its category, URL, and description in structured JSON, intended for developers, AI agents, and anyone building an integration on top of StateCalc rather than scraping HTML.
Do you offer a JavaScript SDK or REST API?
Not yet — today's integration path is the iframe embed plus the public calculators.json index. If you need something more programmatic (e.g. computing results server-side without an iframe), let us know via the contact page; it helps us prioritize what to build next.