Modern calculators are electrically powered (usually by battery and/or solar cell) and vary from cheap, give-away, credit-card sized models to sturdy adding machine-like models with built-in printers. It is such a common and ordinary device in our life and most of we never thought it can be described cool or unusual. While in this post, we will present you 15 Unusual Calculators collected from world. Each of them have something special, like shape, material, usage; and you also can find some innovative designs with combining calculator with some office supply like business card holder or clipboard. Sounds Interesting? Let’s begin!