About ConverterPortal

ConverterPortal is a small, independent website that publishes free calculators for everyday money, work, home and health questions — and explains the math behind every answer.

Why we exist

Search for almost any calculator and you'll find dozens of near-identical pages: a box of inputs, a number, and no way to tell whether the number is right. We think people deserve better when they're working out a paycheck, a loan payoff plan or a medical conversion. So we deliberately keep our collection small — 16 calculators plus paycheck pages for all 50 states and D.C. — and put the effort into getting each one right.

What makes our calculators different

  • Transparent formulas. Every page shows the formula, a worked example with real numbers, and the working for your own inputs.
  • Official sources. Tax figures come from the IRS, the Social Security Administration and state revenue and labor departments; health formulas come from the American Diabetes Association and peer-reviewed research. We link to our sources on every page.
  • Kept current. We review pages when the underlying numbers change — for example each year's tax brackets, wage bases and contribution limits — and show the review date on the page.
  • Private by design. Calculations run in your browser. We don't ask for your name, email or financial details, and we don't store what you type.

Who we are

ConverterPortal Editorial Team. We build and maintain every calculator on this site by hand, test each formula against official sources (IRS, state revenue departments, ADA, industry references), and review the pages whenever the underlying figures change.

How the site is funded

The calculators are free to use. We cover hosting and development costs with advertising served by Google AdSense. Advertisers never influence our calculations or content, and we clearly label ads. Read more in our editorial policy and privacy policy.

Get in touch

Found a mistake, or want a calculator we don't have? We read every message. Contact us or email contact@converterportal.com.