One's Complement & Two's Complement Calculator (1's & 2's Complement Calculator) is a free online tool to find true form and one's & two's complement equivalent for a given intger number.
24 Points Calculator could takes four numbers base on your input and attempts to find an arrangement of these four numbers and the arithmetic operations (× + − ÷) to make the value 24.
Distance calculator could calculate the distance between two points in the rectangular coordinate system, supports two-dimensional coordinates and three-dimensional coordinates.
Twin Calculators (Twofold Calculators), which combines two calculators into one, and the calculation result can be copied and pasted between the two calculators with one click.