OS Calculators: These concept designs comes from a designer at Mintpass; these look exactly like the calculator apps in Windows and in OS X. The Mac version has a metal case and a 2-liner screen similar to its software counterpart, while the Windows calculator sports the classic XP color scheme, and comes with menu headers.
X-ViZ Calculator: Kokuyo's X-ViZ designer calculator is designed to be used single-handedly.
Building Block Calculator: Blocks inspired calculator by Homade comes in black, blue, green and red.
Checkbook Calculator: It keeps track of personal budget, income and expense records; comes with soft black leatherette wallet that holds the checkbook calculator and your checks, bank receipts, credit cards and more.
Water Powered Calculator: A cool water powered calculator, thats cool for school or work.
Ti-nspire Graphing Calculator with Touchpad: You can explore individual representations, one at a time, or as many as four on the same screen. Comes with an easy-glide touchpad that works more like a computer with a mouse. Apart from this you can see multiple representations of a single problem - algebraic, graphical, geometric, numeric and written.
Keyboard Calculator: It has a USB connector that allows it to be used with a computer for entering calculations.
XXL Calculator: This unusual calculator is the same size as an A 4 piece of paper.
Mouse Calculator: An innovative combo product that integrates mouse and numeric keys function in one.
Sleek Calculator and 30cm Ruler: Designed by N Tolstrup, this cool calculator is perfect for architects or artists as it combines a ruler on your calculator.
Credit Card Calculator: This convenient calculator looks like a credit card and comes with raised numeric keys.
Hopscotch Calculator: A clever calculator that takes its inspiration from hopscotch.
Bamboo Calculator: Made from bamboo, its simple and contemporary and comes with dual power supply.
Chocolate Calculator: It's a real calculator that has chocolate's scent and color.
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