Add Free Calculators to Your Website

Pick any calculator below, copy the embed code, and paste it into your page. Your visitors get a fully working tool — and you keep them on your site longer.

100% Free No Sign-Up Mobile Friendly No Tracking Added

Keep Visitors Longer

Interactive tools turn quick visits into engaged sessions. Readers who calculate stay, explore, and come back.

Zero Maintenance

We host, update, and improve every calculator. Your embed always shows the latest version automatically.

Works Everywhere

Responsive iframes adapt to phones, tablets, and desktops. Paste once — it just works.

Popular Calculators to Embed

🏠

Mortgage Calculator

Calculate your monthly mortgage payment including principal, interest, taxes, insurance, and PMI.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/mortgage-calculator" width="100%" height="650" frameborder="0" title="Mortgage Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/loans/mortgage-calculator">Mortgage Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 650px) if the calculator needs more or less room on your page.

🏃

BMI Calculator

Calculate your Body Mass Index and find your weight category.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/bmi-calculator" width="100%" height="600" frameborder="0" title="BMI Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/health/bmi-calculator">BMI Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 600px) if the calculator needs more or less room on your page.

🍽️

Tip Calculator

Calculate restaurant tip, total bill, and split amount between people.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/tip-calculator" width="100%" height="550" frameborder="0" title="Tip Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/finance/tip-calculator">Tip Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 550px) if the calculator needs more or less room on your page.

🎂

Age Calculator

Calculate your exact age in years, months, and days.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/age-calculator" width="100%" height="550" frameborder="0" title="Age Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/time/age-calculator">Age Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 550px) if the calculator needs more or less room on your page.

📈

Compound Interest Calculator

Calculate how money grows with compound interest over time.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/compound-interest-calculator" width="100%" height="650" frameborder="0" title="Compound Interest Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/finance/compound-interest-calculator">Compound Interest Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 650px) if the calculator needs more or less room on your page.

📊

Loan Amortization Calculator

See your complete loan amortization schedule with monthly payment breakdown.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/loan-amortization-calculator" width="100%" height="650" frameborder="0" title="Loan Amortization Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/loans/loan-amortization-calculator">Loan Amortization Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 650px) if the calculator needs more or less room on your page.

👴

Retirement Calculator

Plan your US retirement: estimate the savings needed to maintain your lifestyle with 401(k) and IRA investing.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/retirement-calculator" width="100%" height="650" frameborder="0" title="Retirement Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/loans/retirement-calculator">Retirement Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 650px) if the calculator needs more or less room on your page.

🧮

Temperature Calculator

Free Temperature Calculator — calculate temperature online with the formula, worked examples, and step-by-step instructions.

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Copy & paste this code into your HTML:

<iframe src="https://calcunit.net/embed/temperature-calculator" width="100%" height="550" frameborder="0" title="Temperature Calculator by CalcUnit.net"></iframe>
<p><a href="https://calcunit.net/math/temperature-calculator">Temperature Calculator by CalcUnit.net</a></p>

Tip: adjust the height value (currently 550px) if the calculator needs more or less room on your page.

How Embedding Works

1Choose a calculator above and click “Copy Code”.
2Paste the snippet into your page HTML where you want the tool to appear.
3That’s it — the calculator loads instantly for your visitors, styled to fit any layout.
4A small “Powered by CalcUnit.net” credit appears under the tool so your readers know where it came from.

Embedding is free for personal, educational, and commercial sites. Please keep the attribution link intact — it’s what keeps these tools free for everyone.

Frequently Asked Questions

Is embedding really free?

Yes. Every calculator on CalcUnit.net is free to embed on any website — blogs, business sites, school pages, and forums. No account, API key, or payment required.

Will the embedded calculator slow down my page?

No. The tool loads inside an isolated iframe and only fetches what it needs. Your page speed is unaffected, and the calculator works on phones and tablets too.

Can I customize the colors or size?

You can set any width and height on the iframe. The calculator itself uses a clean neutral design that fits most sites. The attribution line must stay visible.

Do you offer an API instead of iframes?

Not at this time. Iframes are the simplest reliable option — no JavaScript conflicts, no maintenance, and they always show the latest version.

Can I remove the “Powered by CalcUnit.net” link?

Please don’t. That small credit is the only thing we ask for in return, and it’s what keeps all 800+ calculators free for everyone.