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1822 apps · Showing 193–288

Data & Calculators: Math Calculators

Raise a Base to a Power and Reverse Inputs

Raise a Base to a Power and Reverse Inputs. Evaluate a real power or principal root, with reverse inputs where a unique solution exists.

Random Number Range Generator

Generate one or more random integers or decimals within an inclusive range.

Ratio Calculator

Simplify a ratio, convert it to fractions and percentages, and scale it to a chosen total.

Rational Powers in Real Arithmetic

Rational Powers in Real Arithmetic. Evaluate a real power or principal root, with reverse inputs where a unique solution exists.

Real Hyperbolic Functions & Principal Inverses

Evaluate sinh, cosh, tanh and their reciprocals, or recover a real argument from an admissible function value.

Real Logarithm with Any Valid Base

Calculate a real logarithm, recover its positive argument, or solve for a valid logarithm base.

Rectangle Area, Boundary Length and Diagonal

Calculate rectangle area, boundary length and diagonal with bidirectional inputs, compatible units and clear geometric assumptions.

Rectangle Diagonal, Opposite-Long-Side Angle and Boundary

It is the right or obtuse angle opposite the longer side, 2asin(l/d). The other diagonal angle is supplementary. A square gives 90 degrees for both.

Rectangle Dimensions to Square Feet

Calculate a rectangular area in square feet from dimensions in feet, inches or metric units.

Rectangle Linear & Area Scale Comparison

Compare original and scaled rectangle dimensions, including the squared relationship between length scale and area scale.

Rectangle Perimeter & Missing Side

Find a rectangle’s missing side from its perimeter and the other side, with independent length-unit selectors.

Rectangle Perimeter from Area and a Known Side

Calculate rectangle perimeter from area and a known side with bidirectional inputs, compatible units and clear geometric assumptions.

Rectangle Perimeter, Area and Ordered Diagonal Measurements

A feasible pair determines two side lengths up to exchange. This workflow chooses the larger as length and the smaller as width. Area cannot exceed half the squared diagonal; equality describes a square.

Rectangle Side Pair from Area and Perimeter: Larger-Side Branch

Calculate rectangle side pair from area and perimeter: larger-side branch with bidirectional inputs, compatible units and clear geometric assumptions.

Rectangle Side Recovered from Diagonal and Width

Calculate rectangle side recovered from diagonal and width with bidirectional inputs, compatible units and clear geometric assumptions.

Rectangle Sides from Area and Perimeter: Smaller-Side Branch

Calculate rectangle sides from area and perimeter: smaller-side branch with bidirectional inputs, compatible units and clear geometric assumptions.

Rectangle Width from Linked Length, Area or Boundary

Direct length/width entries can use either orientation. When only area and perimeter are supplied, the captured quadratic inverse chooses the larger side as length and the smaller side as width.

Rectangular Box Surface Area and Diagonal

Calculate rectangular box surface area and diagonal with converted units, positive geometric inverses and explicit model limits.

Rectangular Box Volume and Space Diagonal

Calculate rectangular box volume and space diagonal with converted units, positive geometric inverses and explicit model limits.

Rectangular Face Area & Unit Conversion

Calculate the area of one rectangular face, or a missing side, with metric and customary area units.

Rectangular Prism Base, Lateral and Six-Face Areas

Rectangular Prism Base, Lateral and Six-Face Areas. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.

Rectangular Prism Faces, Volume and Space Diagonal

Rectangular Prism Faces, Volume and Space Diagonal. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.

Rectangular Prism Volume from Three Perpendicular Edges

Rectangular Prism Volume from Three Perpendicular Edges. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.

Regular Decagon Dimensions & Four Diagonal Lengths

Compute ten-sided regular-polygon measurements, including the four distinct vertex-to-vertex diagonal lengths.

Regular Dodecagon Dimensions & Five Diagonal Lengths

Relate a regular twelve-sided shape’s side, perimeter, area, radii and five distinct diagonal spans.

Regular Heptagon Side, Area, Radii & Angles

Connect side length, perimeter and circle radii for a seven-sided regular shape, with its interior and central angles.

Regular Hexagon Area, Diagonals and Circle Radii

Regular Hexagon Area, Diagonals and Circle Radii. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Regular Hexagonal Pyramid Face Areas and Capacity

Regular Hexagonal Pyramid Face Areas and Capacity. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Regular Octagon Area and Three Diagonal Lengths

Regular Octagon Area and Three Diagonal Lengths. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Regular Pentagon Area, Diagonal, Height and Apothem

Regular Pentagon Area, Diagonal, Height and Apothem. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Regular Polygon Area from Side, Circumradius or Apothem

Regular Polygon Area from Side, Circumradius or Apothem. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Regular Polygon Boundary Length and Equal Side

This workflow assumes equal sides. For an irregular polygon, add the actual side lengths instead of multiplying one side by n.

Regular Polygon Interior and Turning Angles

It is the nonreflex turning angle 360°/n, supplementary to the interior angle. It is not the reflex angle outside the polygon.

Regular Polygon Side Count, Area & Radii

Choose any whole side count of at least three and solve regular-polygon measurements from a side, perimeter, area or radius.

Regular Tetrahedron: Volume, Area & Sphere Radii

Relate an equal-edge tetrahedron’s edge, height, volume, surface area and inscribed sphere measurements.

Right Circular Cone Dimensions, Surface and Capacity

Right Circular Cone Dimensions, Surface and Capacity. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.

Right Cone Height from Radius, Slant or Volume

Calculate right cone height from radius, slant or volume with converted units, positive geometric inverses and explicit model limits.

Right Cone Slant Length, Base Angle and Half-Apex Angle

Calculate right cone slant length, base angle and half-apex angle with converted units, positive geometric inverses and explicit model limits.

Right Rectangular Pyramid Capacity and Two Face Slants

Right Rectangular Pyramid Capacity and Two Face Slants. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Right Square Pyramid Heights, Faces and Volume

Right Square Pyramid Heights, Faces and Volume. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Right Trapezoid Area, Slant and Base Inverse Branch

Calculate right trapezoid area, slant and base inverse branch with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Right Triangle Calculator

Solve all sides, acute angles, area, and perimeter from two right-triangle legs.

Right Triangle Missing Measurements with Optional Area and Perimeter

Enter two legs, a leg and the hypotenuse, or a leg and area. Retain editable unit controls and optional area/perimeter measures, with positive right-triangle bounds.

Right-Triangle Angles from Legs, Hypotenuse or Area

Calculate right-triangle angles from legs, hypotenuse or area with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Right-Triangle Missing Side with Acute-Angle Controls

Calculate right-triangle missing side with acute-angle controls with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Right-Triangle Perimeter from Legs or Three Sides

Calculate right-triangle perimeter from legs or three sides with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Right-Triangle Side Ratios, Angles and Area

Calculate right-triangle side ratios, angles and area with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Ring and Horn Torus Surface from Inner and Outer Radii

Ring and Horn Torus Surface from Inner and Outer Radii. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.

Rise, Run, Percent Grade & Slope Angle

Convert signed rise and positive horizontal run to slope percentage and angle.

Rolling Coin Spins During One Outside Circuit

The moving center travels a circle with radius equal to the sum of the two coin radii. Dividing that path length by the moving coin circumference gives two self-axis spins for equal coins. This assumes outside rolling without slipping.

Root Calculator

Calculate square, cube, or nth roots, including real odd roots of negative numbers.

Rounding Calculator

Round a number to decimal places or significant figures and compare floor, ceiling, and truncation.

Sample Size Calculator

Estimate a survey sample size from confidence level, margin of error, population, and expected proportion.

Scientific Calculator

Evaluate scientific expressions with powers, roots, trigonometry, logarithms, constants, and factorials.

Scientific Notation Calculator

Convert decimal numbers to normalized scientific and engineering notation.

Segment Endpoint from Midpoint and Known Endpoint

Yes. In that case both endpoints coincide and the segment has zero length. Otherwise subtract the known endpoint from twice the midpoint, independently on each Cartesian axis.

Signed Change Between Two Values

Find the increase or decrease in original units, or recover the starting or ending value from a known change.

Signed Inputs and Nonnegative Modulo Remainders

Calculate the nonnegative residue and the retained alternative signed-remainder conventions for a nonzero divisor.

Signed Proportion Cross Products and Worked Steps

This workflow excludes zero in all four positions. General zero-numerator ratios can be valid, but they can leave an inverse denominator undetermined; those cases are not offered here.

Signed Subtraction & Missing-Value Calculator

Subtract integers or decimals, including negative numbers, or recover either missing input from the difference.

Six Principal Inverse Trigonometric Functions

Select arcsine, arccosine, arctangent, arccotangent, arcsecant or arccosecant and convert its principal angle among supported units.

Slope Calculator

Find slope, distance, midpoint, line equation, and angle from two Cartesian points.

Sphere and Spherical Cap Volumes in Separate Sections

Sphere and Spherical Cap Volumes in Separate Sections. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Sphere Radius from Diameter, Surface, Volume or Circumference

Sphere Radius from Diameter, Surface, Volume or Circumference. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Sphere Radius, Surface, Volume and Inverse-Length Ratio

Calculate sphere radius, surface, volume and inverse-length ratio with converted units, positive geometric inverses and explicit model limits.

Spherical Surface Area and Size Relationships

Calculate spherical surface area and size relationships with converted units, positive geometric inverses and explicit model limits.

Spiral Length Estimate & One-Turn Helix

Estimate a tightly wound planar spiral length, or calculate the length of one uniform helical turn around a cylinder.

Square Area and Positive Side Length

Calculate square area and positive side length with bidirectional inputs, compatible units and clear geometric assumptions.

Square Boundary Length and Diagonal

Calculate square boundary length and diagonal with bidirectional inputs, compatible units and clear geometric assumptions.

Square Diagonal and Positive Side Length

Calculate square diagonal and positive side length with bidirectional inputs, compatible units and clear geometric assumptions.

Square Pyramid Base, Single Face and Closed Surface

Square Pyramid Base, Single Face and Closed Surface. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Square Pyramid Capacity with Optional Surface Inputs

Square Pyramid Capacity with Optional Surface Inputs. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Square Pyramid Height from Seventeen Measurement Pairs

Square Pyramid Height from Seventeen Measurement Pairs. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Square Pyramid Surface, Slants and Positive Inverse Roots

Square Pyramid Surface, Slants and Positive Inverse Roots. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Square Side, Area, Perimeter and Diagonal

Calculate square side, area, perimeter and diagonal with bidirectional inputs, compatible units and clear geometric assumptions.

Standard Deviation Calculator

Calculate population and sample standard deviation, variance, mean, and count for a data set.

Statistics Calculator

Summarize a data set with centre, spread, variance, standard deviation, and sorted values.

Surface Area Calculator

Calculate total and lateral surface area for common solid shapes.

Taylor–Lagrange Remainder Upper Bound

Estimate a Taylor-polynomial remainder bound from degree, center, evaluation point and a valid maximum next-derivative magnitude.

Trapezoid Midsegment from Parallel Bases

Calculate trapezoid midsegment from parallel bases with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Trapezoidal Prism Side-Wall and Closed Surface Areas

Trapezoidal Prism Side-Wall and Closed Surface Areas. Use unit controls and documented positive geometric roots to compare base, lateral and total measures.

Trapezoidal Prism Volume from Cross Section and Depth

Trapezoidal Prism Volume from Cross Section and Depth. Convert compatible units, recover unknown dimensions and distinguish curved surfaces, bases and total measures.

Triangle Angle Weights & Relative Side Ratios

Convert three positive angle weights into triangle angles and obtain relative side lengths through the sine rule.

Triangle Angles, Heron Area and Boundary from Three Sides

No. This SSS workflow accepts three side lengths and keeps area, perimeter and all three angles as read-only outputs. Other triangle workflows provide different supported inverses.

Triangle Area and Perimeter from Cartesian Vertices

No. The absolute determinant removes the orientation sign. Perimeter adds the three point distances. Collinear vertices return zero area, and repeated vertices are allowed as degenerate cases.

Triangle Area from Three Sides and Obtuse Inverse Branch

Calculate triangle area from three sides and obtuse inverse branch with converted units, positive geometric inverses and explicit model limits.

Triangle Area from Two Sides and Included Angle

Generally no. An acute angle and its obtuse supplement have the same sine and triangle area. The backward angle control returns the principal acute or right angle; area cannot exceed ab/2.

Triangle Base Recovered from Area and Altitude

Calculate triangle base recovered from area and altitude with retained unit controls, positive geometric roots and explicit inverse-branch assumptions.

Triangle Calculator

Solve a triangle from three side lengths, including area, perimeter, angles, and classification.

Triangle Circumcircle, Inradius & Area

Calculate a triangle’s circumscribed circle and related geometry from three valid side lengths.

Triangle Exterior Angles and Supplementary Interiors

Enter two interiors, or an interior and a nonadjacent exterior. Adjacent interior/exterior angles are dependent supplements. Two exterior inputs populate the third exterior only in this retained solver.

Triangle Interior and Exterior Angle Relationships

No. Each exterior is the nonreflex supplement of its adjacent interior. Interiors sum to 180 degrees and these exteriors sum to 360 degrees. Enter two interiors or an interior plus a nonadjacent exterior for all fields; two exteriors produce only the third exterior.