About Calxy
Calxy is a collection of 380 free calculators covering finance, health, mathematics, unit conversion, and everyday questions. Each one is designed to give you a correct answer quickly, and to explain how that answer was reached.
Who runs Calxy
Calxy is an independent site. It is not affiliated with any bank, lender, insurer, healthcare provider or government body, and it does not show advertising. Questions and corrections can be sent through the contact page.
How it works
Calculator arithmetic runs in your browser. Shareable calculator settings may be stored in the URL, retained in browser history, and sent to the host when that URL is opened. Avoid sharing links containing sensitive inputs. See our privacy policy.
Pages are pre-rendered as static HTML, so they load immediately and work without JavaScript for reading the explanations, formulas, and reference tables. Only the interactive calculation requires scripting.
We use AI tools to help write explanations and build calculators, and check formulas against known values from cited sources. Our editorial policy explains how.
Our approach to accuracy
Where a field has a standard formula, we use it and name it. The calorie calculator uses the Mifflin-St Jeor equation because validation studies favor it over the older Harris-Benedict formula. The body fat calculator uses the US Navy circumference method and states its expected margin of error. Financial calculators use standard amortization and annuity formulas.
Just as importantly, we try to be candid about limits. A BMI figure cannot distinguish muscle from fat. A retirement projection assuming a constant rate of return will not match reality. A due date is an estimate that only about 4% of births land on. Showing a number without its caveats makes it less useful, not more.
What we do not do
- No accounts, sign-ups, or email collection.
- No account is required to calculate. Share links deliberately include calculator settings; check their contents before sharing.
- No paywalls or usage limits.
Important limitations
These calculators provide general information and estimates. They are not financial, medical, legal, or tax advice, and they cannot account for your particular circumstances. Lenders, clinicians, and tax authorities apply rules and judgments that a general-purpose calculator cannot capture.
For decisions that matter — taking a mortgage, changing your diet, planning your retirement, interpreting a health measurement — treat the output here as a starting point for a conversation with a qualified professional rather than as a conclusion. See our terms of use for the full disclaimer.
Corrections
If you find an error in a calculation or an explanation, we want to know. Every calculator page shows when it was last updated, and formulas are documented so results can be independently checked. Our editorial policy sets out how sources are chosen and how corrections are handled.