Area Calculator
Find the area of a rectangle, square, triangle, circle, or trapezoid.
Open Calculator →Circle Calculator
Enter any one of radius, diameter, circumference, or area to find the other three.
Open Calculator →Sine Calculator
Find the sine of an angle, or find the angle from a known sine value (arcsin).
Open Calculator →Cosine Calculator
Find the cosine of an angle, or find the angle from a known cosine value (arccos).
Open Calculator →Tangent Calculator
Find the tangent of an angle, or find the angle from a known tangent value (arctan).
Open Calculator →Pythagorean Theorem Calculator
Find a missing side of a right triangle from the other two, using the Pythagorean theorem.
Open Calculator →Right Triangle Calculator
Find the hypotenuse, both acute angles, area, and perimeter of a right triangle from its two legs.
Open Calculator →Slope Calculator
Find the slope, angle of incline, and distance between two points.
Open Calculator →Surface Area Calculator
Find the surface area of a cube, box, sphere, cylinder, or cone.
Open Calculator →Volume Calculator
Find the volume of a cube, box, sphere, cylinder, or cone.
Open Calculator →Triangle Calculator
Find all three angles and the area of a triangle from its three side lengths (SSS).
Open Calculator →Trigonometry Calculator
Find all three sides of a right triangle from one angle and one known side, using SOH-CAH-TOA.
Open Calculator →Arccos Calculator
Find the angle whose cosine equals a given value, in degrees or radians.
Open Calculator →Arcsin Calculator
Find the angle whose sine equals a given value, in degrees or radians.
Open Calculator →Arctan Calculator
Find the angle whose tangent equals a given value, in degrees or radians.
Open Calculator →30-60-90 Triangle Calculator
Find all three sides of a 30-60-90 triangle from any one known side, using the fixed 1:√3:2 ratio.
Open Calculator →45-45-90 Triangle Calculator
Find all three sides of a 45-45-90 right triangle from one known leg or the hypotenuse, using the 1:1:√2 ratio.
Open Calculator →Equilateral Triangle Calculator
Find the side, perimeter, area, height, and circumradius of an equilateral triangle from any one of those measurements.
Open Calculator →Isosceles Triangle Calculator
Find the area, perimeter, height, and base angles of an isosceles triangle from its two equal legs and base, or from its base and height.
Open Calculator →Heron's Formula Calculator
Find a triangle's area from its three side lengths using Heron's formula, with the semi-perimeter step shown.
Open Calculator →Hypotenuse Calculator
Find the hypotenuse of a right triangle from its two legs, or from one angle and one known side.
Open Calculator →Law of Cosines Calculator
Find a missing side or angle using the law of cosines, from two sides and the included angle, or from three sides.
Open Calculator →Law of Sines Calculator
Solve a triangle using the law of sines, from two angles and a side, or from two sides and a non-included angle.
Open Calculator →SOHCAHTOA Calculator
Solve a right triangle using SOH-CAH-TOA — find a missing side from an angle and one side, or find the angle from two sides.
Open Calculator →Triangle Area Calculator
Find a triangle's area from base and height, two sides and an included angle, or all three sides.
Open Calculator →Triangle Height Calculator
Find a triangle's height from its base and area, or find the altitude to every side from three side lengths.
Open Calculator →Triangle Perimeter Calculator
Add up three side lengths to find a triangle's perimeter and semi-perimeter.
Open Calculator →Hexagon Calculator
Find the perimeter, area, apothem, and circumradius of a regular hexagon from its side length.
Open Calculator →Octagon Calculator
Find the perimeter, area, and apothem of a regular octagon from its side length.
Open Calculator →Pentagon Calculator
Find the perimeter, area, and apothem of a regular pentagon from its side length.
Open Calculator →Polygon Calculator
Find the perimeter, area, apothem, and interior angle of any regular polygon from its number of sides and side length.
Open Calculator →Rectangle Calculator
Find the area, perimeter, and diagonal of a rectangle from its length and width.
Open Calculator →Rhombus Calculator
Find the area, perimeter, and side length of a rhombus from its two diagonals, or from its side and height.
Open Calculator →Parallelogram Area Calculator
Find the area of a parallelogram from its base and height, or from two sides and the included angle.
Open Calculator →Trapezoid Area Calculator
Find the area of a trapezoid from its two parallel bases and height.
Open Calculator →Ellipse Calculator
Find the area, approximate circumference, and eccentricity of an ellipse from its semi-major and semi-minor axes.
Open Calculator →Perimeter Calculator
Find the perimeter of a rectangle, square, triangle, or regular polygon.
Open Calculator →Radius Calculator
Find a circle's radius from its diameter, circumference, or area.
Open Calculator →Circumference Calculator
Find the circumference of a circle from its radius or diameter.
Open Calculator →Circumference to Diameter Calculator
Convert a circle's circumference to its diameter.
Open Calculator →Sector Area Calculator
Find the area and arc length of a circular sector from its radius and central angle.
Open Calculator →Segment Area Calculator
Find the area of a circular segment from its radius and central angle.
Open Calculator →Arc Length Calculator
Find the length of a circular arc from its radius and central angle.
Open Calculator →Area of a Circle Calculator
Find the area of a circle from its radius or diameter.
Open Calculator →Angle of Depression Calculator
Find the angle of depression from a height and horizontal distance.
Open Calculator →Angle of Elevation Calculator
Find the angle of elevation from a height and horizontal distance, or find the height from an angle and distance.
Open Calculator →Angle Unit Conversion - Convert Angle
Convert an angle between degrees, radians, gradians, and turns.
Open Calculator →Coterminal Angle Calculator
Find a positive and negative coterminal angle for any given angle.
Open Calculator →Degrees to Degrees, Minutes, Seconds Calculator
Convert a decimal degree value to degrees, minutes, and seconds (DMS).
Open Calculator →Degrees, Minutes, Seconds to Decimal Calculator
Convert degrees, minutes, and seconds (DMS) to a decimal degree value.
Open Calculator →Double Angle Calculator
Find sin, cos, and tan of double an angle using the double angle identities.
Open Calculator →Half Angle Calculator
Find sin, cos, and tan of half an angle using the half angle identities.
Open Calculator →Reference Angle Calculator
Find the reference angle and quadrant for any angle, including negative angles and angles past 360 degrees.
Open Calculator →Unit Circle Calculator
Find the (cos, sin) coordinates, tangent, and quadrant for any angle on the unit circle.
Open Calculator →Cosecant Calculator
Find the cosecant of an angle, or find the angle from a known cosecant value.
Open Calculator →Cotangent Calculator
Find the cotangent of an angle, or find the angle from a known cotangent value.
Open Calculator →Secant Calculator
Find the secant of an angle, or find the angle from a known secant value.
Open Calculator →Inverse Cosine Calculator
Find the angle whose cosine equals a given value, in degrees or radians.
Open Calculator →Inverse Sine Calculator
Find the angle whose sine equals a given value, in degrees or radians.
Open Calculator →Inverse Tangent Calculator
Find the angle whose tangent equals a given value, in degrees or radians.
Open Calculator →Distance Between Two Points Calculator
Find the distance between two points using the distance formula.
Open Calculator →Midpoint Calculator
Find the midpoint between two coordinate points.
Open Calculator →Endpoint Calculator
Find a missing endpoint given one endpoint and the midpoint of a line segment.
Open Calculator →Equation of a Line Calculator
Find the equation of a line in slope-intercept form from two points.
Open Calculator →Point-Slope Form Calculator
Find the equation of a line in point-slope form from a point and a slope.
Open Calculator →Slope-Intercept Form Calculator
Find the equation of a line in slope-intercept form, and evaluate y for any x.
Open Calculator →X and Y Intercept Calculator
Find the x-intercept and y-intercept of a line from slope-intercept or standard form.
Open Calculator →Rise Over Run Calculator
Find the slope (rise over run) from two points, or from a direct rise and run.
Open Calculator →Rise Over Run to Degrees Calculator
Convert a rise and run to an angle in degrees.
Open Calculator →Rise Over Run to Percent Slope Calculator
Convert a rise and run to a percent slope (grade).
Open Calculator →Angle Between Two Vectors Calculator
Find the angle between two vectors using the dot product.
Open Calculator →Cross Product Calculator
Find the cross product of two 3D vectors.
Open Calculator →Dot Product Calculator
Find the dot product of two vectors.
Open Calculator →Unit Vector Calculator
Find the unit vector (a vector of length 1) in the same direction as a given vector.
Open Calculator →Vector Addition Calculator
Add two vectors together component by component.
Open Calculator →Vector Calculator
Perform common vector operations: magnitude, addition, subtraction, and dot product.
Open Calculator →Vector Magnitude Calculator
Find the magnitude (length) of a vector.
Open Calculator →Vector Norm Calculator
Find the L1, L2, or L-infinity norm of a vector.
Open Calculator →Vector Projection Calculator
Find the projection of one vector onto another.
Open Calculator →Vector Subtraction Calculator
Subtract one vector from another component by component.
Open Calculator →Area Calculator - Find Area
Find the area of nine common shapes: rectangle, square, triangle, circle, trapezoid, parallelogram, rhombus, ellipse, or regular polygon.
Open Calculator →Area Unit Conversion - Convert Area
Convert an area between square feet, square meters, square yards, acres, hectares, square kilometers, and square miles.
Open Calculator →Barrel Volume and Capacity Calculator
Find the volume of a cylindrical barrel in liters, US gallons, and cubic feet.
Open Calculator →Cone Volume Calculator
Find the volume and slant height of a cone from its radius and height.
Open Calculator →Volume Calculator - Find Volume
Find the volume of a cube, box, sphere, cylinder, cone, or pyramid.
Open Calculator →Volume Unit Conversion - Convert Volume
Convert a volume between liters, milliliters, cubic meters, cubic feet, cubic inches, US gallons, and US quarts.
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