Embed Free Calculators on Your Website

Add any of our 100+ calculators to your site or blog with one copy-paste snippet. Free forever, responsive, lazy-loaded, and always up to date — no sign-up, no API key, no maintenance.

How it works

1Open any calculator — for example the Mortgage Calculator — or browse all calculators.
2Click “Embed this calculator on your website — free” below the calculator.
3Copy the snippet and paste it into your page, post, or CMS — that’s it.

<iframe src="https://www.infinitecalc.com/embed/mortgage-calculator" width="100%" height="620"
  style="border:1px solid #e2e8f0;border-radius:12px;" title="Mortgage Calculator" loading="lazy"></iframe>
<p style="font-size:14px;margin-top:4px;">Free <a href="https://www.infinitecalc.com/mortgage-calculator">Mortgage Calculator</a> by <a href="https://www.infinitecalc.com">InfiniteCalc</a></p>

Popular embeds by site type

Fitness & health sites

Give readers their numbers right inside your article.

BMI Calculator

Calculate your body mass index and see the healthy weight range for your height.

One Rep Max Calculator

Estimate your one-rep max from any set, with training percentages.

Macro Calculator

Get daily protein, carb, and fat targets in grams for your goal.

Protein Calculator

Calculate your daily protein target by body weight and training goal, with per-meal amounts.

Home, garden & DIY blogs

Let readers estimate materials without leaving the page.

Concrete Calculator

How much concrete you need for a slab, footing, or column — in yards and bags.

Paint Calculator

How many gallons of paint your room needs, based on size, openings, and coats.

Mulch Calculator

How much mulch your beds need — in cubic yards and bags.

Square Footage Calculator

Find the square footage of any room or area, with unit conversions and cost.

Finance & real-estate sites

Interactive payment math keeps visitors on your page longer.

Mortgage Calculator

Estimate your monthly mortgage payment, total interest, and amortization schedule.

Loan Calculator

Calculate the monthly payment, total interest, and payoff schedule for any loan.

Compound Interest Calculator

See how principal grows with daily, monthly, quarterly, or annual compounding, plus optional deposits.

APY Calculator

Turn a nominal rate and compounding schedule into true annual yield.

Teachers & student resources

Classroom-ready tools for homework and grading pages.

GPA Calculator

Compute your GPA on the 4.0 scale from letter grades and credit hours.

Grade Calculator

Find your weighted course grade and the score you need on the final exam.

Sig Fig Calculator

Count significant figures in any number and round to a chosen precision.

Fraction Calculator

Add, subtract, multiply, or divide two fractions and get a simplified answer with decimal.

Frequently asked questions

Is embedding really free?

Yes — every calculator on this site can be embedded free of charge, with no account, API key, or usage limit. The embedded calculator is the same one that runs here, so it stays up to date automatically.

Will the embed slow my website down?

No. The snippet uses lazy loading, so the calculator only loads when a visitor scrolls to it, and it is served from a global CDN. Your page’s own load time is unaffected.

Do I have to keep the credit link?

The snippet includes a small “by InfiniteCalc” credit line. You may remove it, but keeping it helps other site owners discover the free embeds and supports the project.

Can I change the size?

Yes — the iframe is responsive and fills the width of its container. You can adjust the height attribute in the snippet if your chosen calculator needs more or less room.