billycalc
5,800+ free online calculators in 8 languages
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billycalc - 5,800+ free online calculators in 8 languages

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Free online calculators for loans, mortgages, taxes, BMI, construction and unit conversion. Every calculator shows the formula and a worked example, runs in the browser and needs no signup. Available in 8 languages: English, Russian, Spanish, Portuguese, French, German, Italian and Indonesian. Site owners can embed any calculator for free with an iframe widget.

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Hi Product Hunt! I'm the solo developer of billycalc. I built a library of ~5,800 calculators (finance, health, construction, math, unit conversion) in 8 languages. Each page shows the formula and a worked example, no signup, no paywall. Any calculator can be embedded via iframe (/embed/{locale}/{slug}/). I'd love feedback on accuracy, UX and which calculators are missing.