This is exactly what I've been looking for for years. A fast easy calculator that's as convenient as a physical school calculator but with familiar programming style input since computers don't have scientific calculator keys. I can do sqrt(2) much easier than Windows' calculator and it doesn't have the ridiculous attempt to copy a physical calculator's quirks like pressing equals twice to re-apply the previous operation or having an "inverse"/"2nd function" button.

Units is a bonus but really just the calculator is less frustrating than anything else I've ever seen. Google search is too unpredictable - morphing into a typical confusing 1970's style keypad design after your first calculation. I tried a couple of desktop applications and they were no better either. Come one calculator app designers - stop trying to copy a physical calculator. Those already have a terrible design and computers don't have the same constraints or freedoms as them.

Even better, it can act like a desktop Windows app simply by saving the page in Chrome! Beat that for latency, Google!