Embeddable calculators for your website

How it works

Open any tool in the list, click Embed this tool, and copy the snippet. It looks like this:

<iframe src="https://7busyboss.com/embed/calculators/math-calculators/percentage-calculator"
        width="100%" height="460" style="border:0"
        loading="lazy" title="Percentage Calculator"></iframe>
<p><a href="https://7busyboss.com/calculators/math-calculators/percentage-calculator">Percentage Calculator</a> by <a href="https://7busyboss.com">7BusyBoss</a></p>

The <iframe> renders the working tool. The line beneath it is the credit — please keep it. That single link is the entire price of using these widgets, and it is what funds keeping them free, ad-free and free of tracking.

Tools you can embed (14)

• Aspect Ratio CalculatorImage & Design · 700px tallResize while preserving aspect ratio — pick a preset or use custom dimensions.
• Black-Scholes CalculatorTrading · 550px tallTheoretical option price + full Greeks (delta, gamma, theta, vega, rho).
• Color Palette GeneratorImage & Design · 1270px tallGenerate harmonious color palettes — analogous, complementary, triadic and more.
• Compound Interest CalculatorCalculators · 680px tallSee how your money grows with compounding — with optional monthly contributions.
• CSS Gradient GeneratorImage & Design · 790px tallBuild linear or radial gradients with multiple stops — copy ready CSS.
• Discount CalculatorCalculators · 720px tallCalculate sale prices, percentage off, and find the original price from a discounted price.
• Drawdown Recovery CalculatorTrading · 440px tallSee exactly how much gain you need to recover from a drawdown. The asymmetry is brutal.
• Percentage CalculatorCalculators · 410px tallCalculate percentages three ways — X% of Y, X is what % of Y, % change.
• QR Code GeneratorImage & Design · 950px tallGenerate QR codes for URLs, text, Wi-Fi, email and phone — 100% in your browser.
• Risk / Reward CalculatorTrading · 510px tallCompute R:R ratio, break-even win rate, and expected value for any trade setup.
• Sharpe Ratio CalculatorTrading · 540px tallMeasure your strategy's risk-adjusted return — the universal trader benchmark.
• Time Zone ConverterTime & Productivity · 630px tallConvert any date and time between any two timezones — auto-detects your local zone.
• Unit ConverterConverters · 480px tallConvert length, weight, temperature, volume and speed — all units, all directions.
• Word Frequency CounterText Tools · 560px tallCount how often each word appears in your text — with stopword filter and visual bars.

Terms, in plain words

• Use them on personal, commercial or client sites. No permission needed.
• Keep the credit link visible and crawlable — don't hide it or add nofollow.
• Don't rehost the widget code on your own domain; embed the hosted URL so fixes reach you.
• We may retire a tool, but embeds will redirect rather than break.

Questions

Is it really free to embed these tools?

Yes. There is no signup, no API key, no usage cap and no fee. The only condition is that you keep the credit line that comes with the snippet — that link is what makes the tools worth maintaining.

Will an embed slow my page down?

The snippet uses loading="lazy", so the browser only fetches the widget when the reader scrolls near it. The embed also ships without any analytics or tracking scripts, so it loads less than the tool page itself does.

Do the embeds track my visitors?

No. The embeddable build deliberately excludes Google Analytics, Google Tag Manager and Vercel Analytics. The calculators run entirely in your reader’s browser and the numbers they type are never sent anywhere.

Can I change the size of the widget?

Yes. The snippet sets width to 100% so it fills your content column, and a fixed pixel height tuned to each tool. Change the height value if your layout needs something different.

What happens if you change or remove a tool?

Embeds point at a stable URL, so improvements reach your page automatically without you editing anything. If a tool were ever retired, the embed would redirect to the closest equivalent rather than break.