javascript-calculator
javascript-calculator
A simple calculator built using HTML, CSS and JavaScript
Controls / Functionality
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Can be controlled using either mouse / touchscreen or by using the keyboard pressing the corresponding keys.
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Backspace deletes last digit.
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Last operation will show up above the input box every time any of the operators is selected.
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Pressing ± after entering the number will change the number to negative one.
Demo 
javascript-number-systems-calculator
Number system conversion calculator built using HTML, CSS and JavaScript
Functionality
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You can only enter characters that correspond to a given number system.
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If you try to enter a character that does not correspond to the given number system, the input field will light up.
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All conversions are done instantly.