CalculatorFox is a free online calculator library with 1,336 tools across 23 categories, covering mortgages, tax, fitness, dates, construction, chemistry, and games. Every calculator runs in the browser, returns an answer instantly, and needs no account.

The difference is transparency. Each tool shows its working step by step, live, as you change the numbers, and lists the sources behind the formula. You see how the answer was reached, not just the result.

Key Features

1,336 free calculators across 23 subject categories, covering everyday, business, health, and technical calculations in one place.
Step-by-step workings update live as you edit the inputs, so results are easy to check, teach from, or explain to a client.
Cited sources on every page name the rules, rates, or standards behind a formula, so you can verify each figure.
Free embeds in three lines of code place any calculator on your site, with no ads inside and no tracking of your readers.
Hosted figures keep an embed's starting values in your account, so changing a rate once updates every page that shows it.
Saved scenarios let you store, compare, export, and share calculations, with client groups and reports on the Advisor plan.

Who Should Use CalculatorFox

Everyday users who want a quick, trustworthy answer for a mortgage payment, salary, BMI, tip, or unit conversion.
Business owners and finance teams pricing products, planning salaries, modelling break-even, and tracking ROI or ROAS.
Financial advisers who need client calculators, grouped scenarios, and embeds carrying their own figures and branding.
Website owners and publishers who want a working calculator on their pages without building or maintaining the math.

Frequently Asked Questions

What is CalculatorFox?

CalculatorFox is a library of 1,336 free online calculators with live results, visible working, and cited sources. Website owners can also embed any calculator on their own pages for free.

Do I need an account to use the calculators?

No. You can search and use all 1,336 calculators without signing in. An account is only needed for paid workspace features such as saved scenarios and hosted embed figures.

Can I embed a calculator on my website?

Yes. Add three lines of code, choose the figures it opens with, and lock any field readers should not change. Embeds are free, ad-free, and do not track your visitors.

How do hosted figures work?

You set an embed's starting values in your account instead of in your page code. When a rate or price changes, updating it once updates every page showing that calculator on its next load.

What is the difference between the free and paid plans?

All calculators are free to use and embed. Personal adds saved, comparable scenarios with no ads, and Advisor adds client reports, client pages, and one embed per website.

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