The best alternatives to kalk are Omni Calculator, Numbr, and UnitConversion. If these 3 options don't work for you, we've listed a few more alternatives below.
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Numbr is a currency calculator, a notepad that understands your calculation. You can use notes with numbers alongside each other. And all your numbers are instantly calculated as you type. It's same as soulver/numi/etc, but for the Web.
UnitConversion.io is an all-in-one unit conversion website. The goal is to be a go-to website for anyone needing to convert any unit. It is available in 6 languages!
CalPal is a fast and beautiful calculator for iPhone and iPad. You get instant results as you type and can use gestures to quickly perform actions. You'll be able to keep track of your calculation history and customise the style with your favourite colour.
I have $12 for breakfast, $30 for lunch, and $18 for dinner. How much does it cost? A basic calculator based on voice intelligent recognition input, which can understand the calculation commands you are talking about to input calculation formulas.