Stepwise.

Widgets

Put a Stepwise calculator on your site

Every calculator here can be dropped onto any page with a single line of HTML. It is free, needs no account, and adds no tracking script — just a working calculator your readers can use, and a small credit link back to the full tool. Pick one, preview it live, and copy the code.

  • US Mortgage Payment Calculator (PITI + PMI)

    The full monthly picture — principal, interest, property tax, insurance and PMI — not just a bare payment. The anchor tool for any real-estate, lending or home-buying page.

    Open the full calculator →Free · credit link required

  • House Affordability Calculator

    Turns a reader's income, debts and deposit into the home price they can realistically afford. A natural fit beside property listings and first-time-buyer guides.

    Open the full calculator →Free · credit link required

  • 401(k) Calculator

    Projects a retirement balance from contributions, employer match and growth. Drops straight into HR, employee-benefits and personal-finance content.

    Open the full calculator →Free · credit link required

  • BMI Calculator

    The health number readers look up most, with the WHO categories and the caveats stated plainly. Ready for any fitness, wellness or health article.

    Open the full calculator →Free · credit link required

  • Percentage Calculator

    The everyday workhorse — percent of, increase, decrease and change. Useful on almost any page that puts a number in front of a reader.

    Open the full calculator →Free · credit link required

How it works

The snippet is a plain iframe plus one line of caption. It carries no script by default, so it survives a CMS or forum that strips scripts; an optional auto-resize version is offered behind a toggle for publishers who can run one.

The only condition is the credit link that comes with the snippet — a normal, followable link back to the calculator. Leave it in place and you are free to use the widget on as many pages as you like.

Want a calculator that is not listed here? Browse the full catalogue — the Embed button on any calculator page gives you the same code.