Trusty Calculator

Transparent calculators for practical decisions

3 followers

Transparent calculators for practical decisions

3 followers

Trusty Calculator is a free library of 433 calculators for construction, finance, math, education, business, health, and unit conversion. Each tool aims to show the formula, assumptions, units, worked examples, and primary sources behind the result. No account is required.

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I built Trusty Calculator because many calculator pages return a number without making it easy to understand where that number came from. The site now includes 433 free tools across practical categories, with formulas, assumptions, units, examples, and sources where applicable. I would especially value feedback on which calculator topics need clearer explanations and which workflows still feel incomplete.

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2mo ago

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