Twin Calculators

Twin Calculators, which combines two calculators into one, and the calculation result can be copied and pasted between the two calculators with one click.


The two calculators are displayed side by side in landscape mode, and vertically in portrait mode.

In addition to separate calculations for each calculator, the calculation result can also be copied and pasted with one click, and other calculations can be performed during the calculation process, which is convenient for comparison and recording of results during calculations.


Calculation results can be imported from one calculator to another with one click:

When the ">>" key is pressed, the calculation result of the calculator on the left will be entered at the end of the formula on the calculator on the right.

When the "<<" key is pressed, the calculation result of the calculator on the right is entered at the end of the formula of the calculator on the left.

Perimeter Calculator supports perimeter calculations for common geometric figures such as Circular, Sector, Ellipse, Triangle, Square, Rectangle, and Parallelogram.  You can use different formulas and methods to calculate the perimeter of these geometric figures depending on the shape and the given information.

Perimeter Calculator

Perimeter Calculator supports perimeter calculations for common geometric figures such as Circular, Sector, Ellipse, Triangle, Square, Rectangle, and Parallelogram. You can use different formulas and methods to calculate the perimeter of these geometric figures depending on the shape and the given information.
Area Calculator supports area calculations for common geometric figures such as Circular, Sector, Ring, Ellipse, Triangle, Square, Rectangle, Parallelogram and Trapezoid.

Area Calculator

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

Surface Area Calculator

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.
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.

Volume Calculator

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.