Free Online Calculators – Finance, Health & Everyday Math

Yes. Every calculator is free to use, with no sign-up, subscription or hidden fee. Open a tool, enter your numbers and get your result right away.

Our calculators use standard, widely accepted formulas, and each page explains the formula behind the result. Results are estimates based on the numbers you enter, so accuracy depends on your inputs. Rounding and rate assumptions can also cause small differences from other tools or from your bank.

They’re a good starting point for planning and comparing options such as mortgage payments, loan costs, compound interest or retirement savings. Actual offers from lenders can include fees, taxes, insurance and rate changes that a general calculator can’t predict. For major decisions, confirm the numbers with a qualified financial professional or your lender.

No. Tools like BMI and calorie calculators give general guidance based on averages. They don’t account for muscle mass, age, medical conditions or other individual factors. Talk to a doctor or registered dietitian before making significant health or diet changes.

Calculators shouldn’t require personal information, and you don’t need an account. Please check our Privacy Policy for how any data, such as analytics or cookies, is handled. Avoid entering sensitive details such as account numbers or ID numbers into any online tool.

Differences usually come from compounding frequency, rounding, rounding of interest rates, or whether taxes, insurance and fees are included. Check that the inputs match exactly, such as the rate type, loan term and payment frequency. Each of our calculator pages explains how the result is worked out.

Yes. They are designed to work on phones, tablets and desktops in any modern browser, with no app to download.

Every calculator page includes a short guide covering the formula, how to use it, an example calculation and what the result means. If a term is unclear, such as APR, amortization or BMR, start with the example calculation, then try your own numbers.

You can copy or screenshot your results to keep or share. Since no account is required, results aren’t stored on our servers, so save anything you need before closing the page.

Use the Contact Us page to report a bug, an incorrect result or a calculator you’d like to see. Feedback helps keep the tools accurate and useful.