Free calculators for your website

Pick any of our tools, copy the code, paste it into your page. No account, no API key, no cost.

What you get

• Resizes itself. The calculator tells your page how tall it is, so there's no scroll bar inside a scroll bar, on phones or desktops.
• Only the calculator. Our header, menus and articles are hidden in the embed. Visitors see the tool and a small credit line.
• Private. Calculations run in your visitor's browser. Nothing they type is sent to us or to you.
• Always up to date. When tax brackets, rates or platform limits change, the calculator on your page updates with them.

Popular picks

• Real estate and lending sites: mortgage, home affordability, rent vs buy.
• Finance blogs: compound interest, paycheck, debt payoff.
• Teachers and schools: GPA, grade, percentage.
• Gyms and coaches: BMI, calories, one rep max.
• Creator agencies and streamer sites: engagement rate, streamer earnings, safe zone checker.

The rules

Embedding is free for personal, school and business sites. Keep the credit link under the calculator in place, and don't put the calculator behind a paywall or present it as your own. The full terms are in our terms of use. Want a calculator we don't have yet? Ask us.

Each tool page also has an Embed button, which can start the calculator with the numbers you entered.