Calculator.net
Scientific, financial, date, and unit calculators in one place. Installable, works offline. Far more powerful than your phone's built-in calculator. Each calculator keeps its own history, so a mortgage figure is still there after switching to the unit converter and back.
Calculator.net opens in a browser tab — no download.
Not sure how to add Calculator.net to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.
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