Welcome to FOC – Free Online Calculators. Our goal is simple: to give everyone fast, free and easy-to-use calculators for everyday money and number questions, without sign-ups, pop-ups or clutter.
What we offer
FOC provides online calculators for loans, savings and interest, percentages, dates and more. Every calculator is designed to work on phones, tablets and computers, and each one comes with a plain-English explanation of how it works, the formula behind it, and worked examples so you can understand your result, not just see a number.
How our calculators work
- Calculations run directly in your web browser. The numbers you enter are not sent to our servers and are not stored.
- We use standard, widely published formulas (for example, the standard amortization formula for loan payments).
- We review and update our calculators and articles when rules, rates or best practices change.
Accuracy and limits
Our calculators give estimates for general information and planning. Real-world results can differ because of fees, taxes, rounding, rate changes and the specific terms of your lender or provider. Please read our Terms & Disclaimer and confirm important figures with a qualified professional before making financial decisions.
Our calculators
We build calculators in a few simple groups, so you can find the right one quickly:
- Money and loans: Loan Payment, Compound Interest, Savings Goal, Credit Card Payoff, Debt Snowball, Rule of 72, Overtime Pay, Self-Employment Tax, 401(k) Calculator, Roth IRA Calculator, Paycheck Calculator, Student Loan Calculator, House Affordability Calculator, Budget Calculator and Hourly to Salary.
- Health: BMI Calculator and Ovulation Calculator and Calorie Calculator, Protein Calculator and Water Intake Calculator.
- Everyday math: Percentage, Discount, Tip & Bill Splitter and the Scientific Calculator.
- Dates and school: Age, Days Between Dates and Weighted Grade.
How we write and check our content
Every calculator page follows the same steps. We choose a formula that is widely published, test the calculator against hand-worked examples, and then write a plain-English guide that explains the formula, shows worked examples and points out common mistakes. Where it helps, we link to trusted public sources such as government agencies and universities so you can read more. If we find an error, we fix it and update the page.
We do not give personal financial, legal or tax advice. Our tools are designed to help you understand the numbers and compare options before you talk to a qualified professional.
How we support the site
FOC is free to use. The site is supported by advertising, including Google AdSense. You can read how advertising and cookies work on our Privacy Policy page.
Get in touch
Found a mistake, or want a calculator we do not have yet? Please tell us through our Contact page. We read every message.