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.

Convert Roman numerals to numbers and convert numbers to Roman numerals.

Evaluate math expression, like a calculator on steroid (you can use function like sqrt, cos, sin, abs, ...).

Easily calculate percentages from a value to another value, or from a percentage to a value.

Ratio Calculator is a free online tool that helps you to find the ratio of two or more numbers, simplify a ratio to its lowest terms, convert a ratio to a fraction, find equivalent ratios, and solve ratio word problems. Ratio Calculator can also help you to calculate the proportion of two quantities, the aspect ratio of a shape or an image, the cross multiplication of two fractions, and the golden ratio of a line segment.

Matrix Calculator is a free online tool that can perform various operations on matrices, such as finding the determinant, inverse, transpose, rank, power, sum, multiplication, and decomposition of matrices.

Random Number Generator is a free online tool that can create one or more random numbers within a specified range or distribution.

Volume Calculator supports volume calculations for common geometric figures such as Sphere, Spherical Sector, Segment, Cylinder, Hollow Cylinder(Pipe), Oblique Straight Cylinder, Cone, Circular Truncated Cone, Ellipsoid, Triangle Prism, Pyramid, Cube, Cuboid, Torus and Sphere Belt.

Surface Area Calculator supports surface area calculations for common geometric figures such as Sphere, Spherical Sector, Segment, Cylinder, Hollow Cylinder(Pipe), Oblique Straight Cylinder, Cone, Circular Truncated Cone, Ellipsoid, Triangle Prism, Pyramid, Cube, Cuboid, Torus and Sphere Belt.

Area Calculator supports area calculations for common geometric figures such as Circular, Sector, Ring, Ellipse, Triangle, Square, Rectangle, Parallelogram and Trapezoid.