About, methodology & sources

Calcora US is a collection of free, accurate United States calculators — take-home pay, taxes, mortgages, loans, savings and everyday maths. Every tool runs entirely in your browser, with no sign-up and no cost, and your figures never leave your device.

Who is behind this site

Calcora US is built and maintained by Ofir Baranes, an independent software developer, as a personal project to make complex United States financial calculations simple, accurate and transparent. This site is not a financial institution, accountant or licensed adviser — it is a free reference tool. For corrections and feedback: ofirbaranesad@gmail.com.

Methodology — how the numbers are calculated

Every tax and financial calculator implements the official formula and rates in force for the 2026 tax year (returns filed in 2027). Rates (income-tax bands, National Insurance / FICA, VAT / sales tax, allowances and contribution caps) are checked by hand against the official publications and updated when the authorities change them. All calculations run fully in the browser (JavaScript), so they can be inspected and reproduced at any time.

The figures are based on these official sources:

Where no government authority applies (general maths, dates, conversions and general health metrics), a standard, widely accepted formula is used without citing a regulatory source.

Accuracy & freshness standards

Freshness: financial values are dated on every calculator page and marked with dateModified in the structured data. Last reviewed: 2026-06-14.
Transparency: every calculation is visible and runs client-side — there is no "black box" and nothing is sent to a server.
Corrections: found an inaccuracy? Email us and it will be reviewed and updated promptly.

Important disclaimer

Results on this site are for illustration and estimation only and do not constitute professional (financial, tax, medical or legal) advice. Rates and rules can change, and individual cases have exceptions. Before making a financial or medical decision, verify the figures against the official source and consult a qualified professional.

Privacy

All calculations run on your device only and are not sent to a server. See our accessibility statement for how the site is built for everyone.

Contact

For questions, suggestions and to report inaccuracies: ofirbaranesad@gmail.com