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Free calculators for your website

Give readers a working tool alongside your explanation. Calculator786 has 68 practical calculators with formulas, worked examples and stated assumptions. Choose a tool below, copy its embed code, or link directly to its full page.

Installation instructions · Linking and attribution · Privacy and limitations

Choose a calculator for your readers

These six tools cover common publishing needs. Every other main calculator also has an embed-code section on its full page. Use a tool because it helps your readers; there is no requirement to exchange links or recommend Calculator786.

Budgeting articles and financial-wellbeing pages

Monthly budget calculator

Let readers combine weekly income, monthly bills, annual costs and a savings target without treating every month as four weeks.

Open calculator and method · Preview the widget

Embed code for Monthly budget calculator

<div data-calculator786="monthly-budget"></div>
<script async src="https://calculator786.com/embed.js"></script>

Freelancer guides and business resource pages

Freelance quote & project profit

Compare fixed-price and hourly projects after revisions, administration, expenses and percentage fees.

Open calculator and method · Preview the widget

Embed code for Freelance quote & project profit

<div data-calculator786="freelance-quote"></div>
<script async src="https://calculator786.com/embed.js"></script>

Seller education and ecommerce guides

Marketplace profit & selling price

Help readers separate markup from margin and include shipping, returns and payment fees in an order profit estimate.

Open calculator and method · Preview the widget

Embed code for Marketplace profit & selling price

<div data-calculator786="marketplace-profit"></div>
<script async src="https://calculator786.com/embed.js"></script>

Household energy and budgeting guides

Energy tariff comparison

Compare user-entered standing charges, unit rates and off-peak consumption. This is not a live supplier quote.

Open calculator and method · Preview the widget

Embed code for Energy tariff comparison

<div data-calculator786="energy-tariff-comparison"></div>
<script async src="https://calculator786.com/embed.js"></script>

Developer articles and SaaS planning guides

AI application profitability

Estimate application costs after token use, cache share, retries, payment fees and fixed operating costs.

Open calculator and method · Preview the widget

Embed code for AI application profitability

<div data-calculator786="ai-app-profitability"></div>
<script async src="https://calculator786.com/embed.js"></script>

Numeracy lessons and study resources

Fraction calculator

Work through fraction arithmetic with the calculation method and examples available on the full tool page.

Open calculator and method · Preview the widget

Embed code for Fraction calculator

<div data-calculator786="fraction-calculator"></div>
<script async src="https://calculator786.com/embed.js"></script>

Install an embed

Copy the two-line snippet for your chosen calculator.
In WordPress, paste it into a Custom HTML block; in another CMS, use its HTML/embed block. Your editor must allow script tags. On a plain HTML site, paste it where the calculator should appear.
If your platform strips scripts, link to the full calculator instead, or use its widget preview URL as the source of a titled iframe with enough height and scrolling enabled.
If your site uses a Content Security Policy, allow https://calculator786.com in script-src and frame-src for the script-based embed.
Publish a preview and test it on a phone and with a keyboard. The loader adjusts the frame height; exceptionally long forms can still scroll inside the frame.

Textareas above contain examples, not running scripts. Select the text in a box and copy it with your keyboard or device menu.

Linking and attribution

For an editorial reference, link to the full calculator page rather than an embed URL or a saved result containing personal inputs. Name the tool in your own description and explain the task it supports. The full page includes its method and assumptions for readers to check.

Widget credit is branded and its outgoing links use nofollow. You may also qualify any credit link you place on your own site with rel="nofollow" or rel="sponsored" as appropriate. An embed is not a request for ranking credit or a guaranteed backlink. See the embedding terms.

Privacy and limitations

Inputs for these tools are calculated in the visitor’s browser, not submitted for calculation. Embed pages exclude the site’s Google Analytics tag and ad placements. Hosting still requires requests for the files; see the privacy notice. A link shared with calculator inputs exposes those values to its recipients.

These tools estimate the assumptions entered. Currency selectors label amounts without converting them. Tax, financial, health and religious tools have their own scope limits; review the full page before recommending one. Do not present results as personalised professional advice or an endorsement by Calculator786.

Want another tool? Browse all calculators and use the embed section on its page.