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1200 free calculators on a static site: notes on client-side SEO

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I have spent the last few months building CalcProMaster, a free library of 1200+ online calculators: loan EMI, mortgage, compound interest, BMI, percentage, GPA, unit conversion and a lot more. Here is what actually mattered while building it. No signup, no paywall, no usage limit. Every calculator must show the formula and the full working, not just a number. Everything runs in the browser, so there is no per-calculation server cost.

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