Embed Calculators

Add free calculator widgets to your blog or website

Finance

Everyday

Math

Health & Sports

Technology

Business

Conversion

Compound Interest Calculator

Calculate how your investments grow over time with compound interest and regular contributions.

Discount Calculator

Calculate the final price after applying a single discount. Quick and simple.

Discount Percentage Calculator

Find out what percentage discount was applied by entering the original and final prices.

Multiple Discount Calculator

Calculate the final price after applying several chained discounts and find the total effective discount.

Savings Goal Calculator

Calculate how much you need to save per day, week, month, or year to reach your financial goal on time.

Percentage Calculator

Calculate percentages instantly: find X% of a number, what percentage one number is of another, or the percentage change between two values.

BMI Calculator

Calculate your Body Mass Index (BMI) instantly. Get your WHO classification, healthy weight range, and personalized recommendations.

Running Pace Calculator

Calculate your running pace, time, or distance. Get splits, speed, and race predictions with the Riegel formula.

Token Calculator

Calculate the cost of using AI language models. Estimate tokens from text and compare pricing across models like GPT-4, Claude, and Gemini.

Mortgage Calculator

Calculate your monthly mortgage payment, total interest, and view a full amortization schedule. Includes property tax, insurance, PMI, and extra payment analysis.

Loan Calculator

Calculate your monthly loan payment, total interest, and total cost. Compare up to 3 loan scenarios side by side. Supports fixed (annuity) and decreasing payment methods.

Loan Comparison

Compare up to 3 loan scenarios side by side. See which loan costs less in total interest and find the best deal.

Crowdfunding ROI Calculator

Calculate the return on investment for crowdfunding projects. Estimate net profit, annualized ROI, and fees.

Age Calculator

Calculate your exact age in years, months, and days. Find out how many total days, weeks, hours, and minutes you have lived — plus how many days until your next birthday.

Date Duration Calculator

Calculate the exact duration between two dates and times. Get results in years, months, days, hours, minutes, and seconds.

Shoe Size Converter

Convert shoe sizes between US, UK, EU, JP, KR, BR, MX, AU and foot length. Instant results for men, women, and kids.

Shoe Size Converter: US to EU

Convert shoe sizes between US and EU instantly. Quick reference charts for men's, women's, and kids' sizes with foot length in cm and inches.

Shoe Size Converter: US to UK

Convert shoe sizes between US and UK instantly. Quick reference charts for men's, women's, and kids' sizes with foot length in cm and inches.

Shoe Size Converter: EU to UK

Convert European to UK shoe sizes instantly. Complete EU to UK size charts for men's, women's, and kids' footwear with foot length measurements.

VAT / Sales Tax Calculator

Calculate VAT, GST, or sales tax instantly. Add or remove tax from any price with automatic rate detection for 30+ countries.

BMR Calculator (Basal Metabolic Rate)

Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Get personalized calorie targets for weight loss, maintenance, and weight gain.

Cooking Converter

Convert between any cooking measurements: cups, tablespoons, teaspoons, ml, liters, grams, kg, ounces, and pounds. Ingredient-aware for volume-to-weight conversions.

Cups to Grams Converter

Convert cups to grams and grams to cups for 30 cooking ingredients. Quick fraction buttons, ingredient selector, and reference table.

Tablespoons to ML Converter

Convert tablespoons to milliliters and ml to tbsp. Supports US, metric, and Australian tablespoon standards.

Ounces to Grams Converter

Convert ounces to grams and grams to ounces instantly. Quick reference table for common weight conversions.

Islamic Mahr Calculator

Calculate Islamic mahr (dowry) in your local currency using live gold and silver prices. Supports Mahr Fatimi, minimum mahr, gold-based, silver-based, and income-based methods.

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Free Calculator Widgets for Your Website or Blog

Smart Calculators offers 30+ free, embeddable calculator widgets that you can add to any website, blog, or landing page in under 2 minutes. Each widget is fully responsive, works in 30 languages, and requires no coding knowledge -- just copy the embed code and paste it into your HTML editor.

Whether you run a personal finance blog, a health and fitness site, a real estate portal, or a cooking community, there is a ready-made calculator widget here that adds genuine utility for your readers. Unlike calculator builders that require you to design formulas from scratch, every Smart Calculators widget ships with industry-standard formulas already built in, professionally validated, and localized for your audience's language and currency.

Why Embed a Calculator Widget on Your Website?

Embedding an interactive calculator increases time on page by 40-60% on average, reduces bounce rates, and gives visitors a concrete reason to return. A visitor who calculates their mortgage payment or checks their BMI on your site is far more engaged than one who reads a static paragraph about the same topic.

For bloggers and content creators, calculator widgets turn passive readers into active users. A finance article about compound interest becomes dramatically more valuable when readers can plug in their own numbers and see personalized results right on your page. The same applies to health articles with a BMI calculator, cooking guides with a unit converter, or running blogs with a pace calculator.

From an SEO perspective, embedded calculators increase dwell time and reduce pogo-sticking -- two behavioral signals that search engines use to evaluate content quality. Pages with interactive tools consistently outperform text-only pages for engagement metrics.

How to Embed a Calculator on Your Website

Adding a Smart Calculators widget to your site takes 3 simple steps:

1. Browse the calculator list above and click the "Embed" button on the calculator you want.

2. Choose your preferred theme (light or dark) and preview how the widget will look on your site.

3. Copy the generated embed code and paste it into your website's HTML editor, WordPress block, Wix HTML widget, Squarespace code block, or any platform that accepts custom HTML.

The embed code includes a lightweight script that loads the calculator inside a responsive container. It automatically adapts to the width of its parent element, so it looks great on desktop, tablet, and mobile screens without any extra configuration.

No sign-up is required. No API keys. No monthly limits. The widget works immediately after you paste the code.

Available Calculator Categories

Smart Calculators covers a wide range of topics organized into clear categories, so you can find the right widget for your audience:

Finance: compound interest, mortgage, loan comparison, savings, ROI, crowdfunding ROI, and VAT calculators. Perfect for personal finance blogs, real estate sites, and investment platforms.

Health and Fitness: BMI calculator, BMR (basal metabolic rate) calculator, and running pace calculator. Ideal for health blogs, fitness coaching sites, and wellness communities.

Everyday Tools: discount calculator, multiple discount calculator, percentage calculator, age calculator, and date duration calculator. Great for shopping blogs, coupon sites, and general-purpose content.

Conversion Tools: shoe size converters (US-EU, US-UK, EU-UK), cooking unit converter, cups to grams, tablespoons to mL, and ounces to grams. Essential for international fashion sites, recipe blogs, and cooking communities.

Technology: AI token calculator for estimating API costs across LLM providers. Valuable for tech blogs and developer communities.

New calculators are added regularly. If you embed a widget today, your visitors will automatically get the latest version -- no code updates needed on your end.

What Makes These Widgets Different

Most embeddable calculator services either require you to build formulas from scratch or lock key features behind a paywall. Smart Calculators widgets are different in several important ways.

30 languages built in. Every widget automatically displays in the language matching the embed locale you select. If you run a Spanish-language blog, the calculator interface, labels, and currency formatting will all be in Spanish with euros or the currency of the target market. This is not machine translation -- each locale is independently optimized by native speakers.

Ready-made, validated formulas. You do not need to enter any formulas or configure calculation logic. Every calculator uses industry-standard math that has been verified against official sources. The compound interest calculator uses the standard A = P(1 + r/n)^(nt) formula. The BMI calculator follows WHO guidelines. The mortgage calculator supports both French (annuity) and linear amortization methods.

Completely free with no limits. There is no freemium tier, no monthly view cap, no forced branding, and no account required. You copy the code, paste it, and it works -- permanently.

Light and dark themes. Every widget supports both light and dark themes that you select during configuration. The widget will match your site's look and feel out of the box.

Responsive by default. Widgets adapt to any container width, from a narrow sidebar to a full-width content area. They render correctly on all screen sizes without extra CSS.

Embedding on WordPress, Wix, Squarespace, and Other Platforms

The embed code works on any platform that supports custom HTML. Here is how to add it on the most popular website builders:

WordPress (Block Editor): Add a "Custom HTML" block where you want the calculator to appear, paste the embed code, and publish. The widget renders immediately in both preview and live modes.

WordPress (Classic Editor): Switch to the "Text" tab in the editor, paste the embed code at the desired position, and update the post.

Wix: Add an "Embed a Site" or "Custom Element" component from the Add menu, paste the embed URL, and adjust the frame size.

Squarespace: Add a "Code" block to your page, paste the embed code, and save. The widget will be responsive within the block's width.

Shopify: In the theme editor or blog post editor, switch to HTML view and paste the embed code.

Google Sites: Use the "Embed" option from the Insert menu and paste the URL from the embed code.

For any platform not listed here, the general process is the same: find the HTML or embed section in your editor, paste the code, and save.

Best Practices for Calculator Widget Placement

Where you place a calculator widget on your page matters. Here are tested strategies that maximize engagement:

Place the widget after your introduction but before the detailed article. Readers who arrive from a search query often want to calculate something immediately. Putting the tool near the top lets them get their answer fast, and then they continue reading your content for context and explanation.

Match the widget to the article topic. A blog post about "How to Calculate Compound Interest" should embed the compound interest calculator, not a generic widget. Topic-matched calculators see 3-5x higher interaction rates than mismatched ones.

Use a descriptive heading above the widget. Something like "Try It: Calculate Your Mortgage Payment" gives visitors a clear call to action. This heading also helps search engines understand the interactive content on your page.

Consider sidebar placement for evergreen tools. If your site has a sidebar, a percentage calculator or BMI calculator can serve as a permanent utility that visitors use regardless of which page they landed on.

Do not overload a single page with too many widgets. One or two calculators per page keeps the experience focused. If you want to offer many calculators, link to your own embed page or create a dedicated tools section.

Frequently Asked Questions

Yes, every calculator widget is 100% free with no hidden costs, no monthly view limits, and no account required. You can embed as many calculators as you want on as many pages as you need. There is no premium tier or paywall.

No coding skills are needed. The process is copy-paste: click the Embed button, choose a theme, copy the generated code snippet, and paste it into your website's HTML editor. The entire process takes under 2 minutes.

Yes. In the WordPress Block Editor (Gutenberg), add a Custom HTML block and paste the embed code. In the Classic Editor, switch to the Text tab and paste the code. The widget is fully compatible with all WordPress themes and works on both desktop and mobile.

Yes. Smart Calculators supports 30 languages including Spanish, German, French, Portuguese, Hindi, Arabic, Japanese, Korean, Turkish, and more. When configuring the embed, select the locale that matches your audience, and the entire widget -- labels, currency, number formatting -- will display in that language.

Yes. Every widget is built with responsive design and automatically adapts to the width of its container. It renders correctly on desktop monitors, tablets, and smartphones without any additional CSS or configuration.

No. The embed code loads asynchronously, meaning it does not block your page from rendering. The widget script is lightweight and all calculations run client-side in the visitor's browser, so there is no server processing delay.

You can choose between light and dark themes during the embed configuration. The widget uses a clean, modern design that blends well with most website styles. The responsive container automatically adjusts to match your content area's width.

There is no technical limit, but for the best user experience we recommend 1-2 calculators per page. Each calculator loads independently, so adding multiple widgets will not cause conflicts. For sites that want to offer many calculators, consider creating a dedicated tools or resources page.

Embed Calculators

Compound Interest Calculator

Discount Calculator

Discount Percentage Calculator

Multiple Discount Calculator

Savings Goal Calculator

Percentage Calculator

BMI Calculator

Running Pace Calculator

Token Calculator

Mortgage Calculator

Loan Calculator

Loan Comparison

Crowdfunding ROI Calculator

Age Calculator

Date Duration Calculator

Shoe Size Converter

Shoe Size Converter: US to EU

Shoe Size Converter: US to UK

Shoe Size Converter: EU to UK

VAT / Sales Tax Calculator

BMR Calculator (Basal Metabolic Rate)

Cooking Converter

Cups to Grams Converter

Tablespoons to ML Converter

Ounces to Grams Converter

Islamic Mahr Calculator

Free Calculator Widgets for Your Website or Blog

Why Embed a Calculator Widget on Your Website?

How to Embed a Calculator on Your Website

Available Calculator Categories

What Makes These Widgets Different

Embedding on WordPress, Wix, Squarespace, and Other Platforms

Best Practices for Calculator Widget Placement

Frequently Asked Questions

Are the calculator widgets really free to use on my website?

Do I need coding skills to embed a calculator?

Will the calculator widget work on WordPress?

Can I embed the calculator in a language other than English?

Is the calculator widget responsive and mobile-friendly?

Will embedding a calculator slow down my website?

Can I customize the look of the calculator to match my site?

How many calculators can I embed on a single page?

Free Calculator Widgets for Your Website or Blog

Why Embed a Calculator Widget on Your Website?

How to Embed a Calculator on Your Website

Available Calculator Categories

What Makes These Widgets Different

Embedding on WordPress, Wix, Squarespace, and Other Platforms

Best Practices for Calculator Widget Placement

Frequently Asked Questions

Are the calculator widgets really free to use on my website?

Do I need coding skills to embed a calculator?

Will the calculator widget work on WordPress?

Can I embed the calculator in a language other than English?

Is the calculator widget responsive and mobile-friendly?

Will embedding a calculator slow down my website?

Can I customize the look of the calculator to match my site?

How many calculators can I embed on a single page?