About CalcAuthority

CalcAuthority is a calculator resource built around a simple idea: a good calculator should show its work. Too many online tools return a number with no explanation. We pair each calculator with its formula, worked examples, and clear answers to common questions.

What We Cover

Our current focus is salary and paycheck tools — converting between annual and hourly pay, estimating take-home income — alongside core finance and math calculators for loans, mortgages, percentage change, and fuel costs. We expand the library deliberately, prioritizing accuracy and useful supporting content over sheer volume.

Our Approach

We publish the formula behind every tool and document our assumptions on our Methodology page. If you have a question or spot something that could be clearer, please contact us.