Personal Finance Calculator Website

This package builds a website of personal finance calculators, such as mortgage, loan, savings, retirement and budget tools, for finance bloggers, educators and comparison sites that want calculators readers return to and share. Each one runs in the browser, updates as sliders move, and shows the answer as a figure and a chart.

How a calculator page is built

Each page has the tool at the top, the result explained in plain words beneath it, and then the formula written out with the inputs named, so readers can check the math themselves. Business adds amortization and growth tables, so a reader sees year by year how much of a payment goes to interest. Inputs live in the page address, so a scenario can be bookmarked or sent to a partner.

Accuracy you can check

Before launch, every calculator is tested against worked examples you supply or against a reference spreadsheet, and the test cases are kept with the code. Rounding follows the convention you choose. Premium formats currency and numbers by locale and lets readers compare two scenarios side by side, such as a 15-year against a 30-year mortgage.

• Business also adds embed code so other sites can place a calculator with a link back to you.
• Email capture offers a PDF of the results, which grows your list from people already engaged with the topic.
• Premium covers up to fifteen calculators, a blog for finance guides and an accessibility and speed pass.

Estimates, not advice

Every calculator states that results are estimates for education and not financial, tax or legal advice. Country-specific items such as mortgage insurance, property tax or contribution limits are included only when you specify the rule and its source, because they change and differ by market.