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Octagon Calculator
Area, perimeter and angles of a regular 8-sided polygon.
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Free math calculators for everyday questions, from quick checks to detailed breakdowns.
Math tools (70)
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Orthocenter Calculator
Orthocenter of a triangle from its vertices.
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Parallelogram Area Calculator
Area of a parallelogram.
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Pentagon Calculator
Area, perimeter and angles of a regular 5-sided polygon.
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Perimeter Calculator
Perimeter of common shapes.
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Polygon Interior Angle Calculator
Interior and exterior angles of a polygon.
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Prism Volume Calculator
Volume of any prism from base area and height.
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Pyramid Volume Calculator
Volume of a pyramid from its base area and height (rectangular base).
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Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle.
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Radius Calculator
Radius of a circle from diameter, circumference or area.
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Rectangle Calculator
Area, perimeter and diagonal of a rectangle.
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Rectangular Prism Volume Calculator
Volume of a rectangular prism (box).
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All math calculators by topic (207)
Advanced
Algebra
- Angle Between Two Vectors Calculator
- Antilog Calculator
- Arithmetic Sequence Calculator
- Average Rate of Change Calculator
- Common Factor Calculator
- Common Multiple Calculator
- Cross Product Calculator
- Dot Product Calculator
- Euclidean Algorithm Calculator
- Exponent Calculator
- Exponential Decay Calculator
- Exponential Growth Calculator
- Factor Calculator
- GCF Calculator
- Geometric Sequence Calculator
- LCM Calculator
- Line Equation from Two Points Calculator
- Linear Equation Calculator
- Linear Interpolation Calculator
- Log Calculator
- Matrix Calculator
- Matrix Determinant Calculator
- Matrix Multiplication Calculator
- Number Sequence Calculator
- Perfect Square Calculator
- Point-Slope Form Calculator
- Polynomial Calculator
- Polynomial Long Division Calculator
- Power of 2 Calculator
- Prime Factorization Calculator
- Quadratic Formula Calculator
- Slope Calculator
- Slope-Intercept Form Calculator
- Solve for Unknown Fraction (Cross Multiplication)
- Standard Form to Slope-Intercept Form Calculator
- Sum of Series Calculator
- System of Equations Calculator
- Unit Vector Calculator
- Vector Magnitude Calculator
- Vector Projection Calculator
- Vector Subtraction Calculator
- Vertex Form Calculator
Arithmetic
Basic
- Absolute Value Calculator
- Average Calculator
- Compare Fractions Calculator
- Cube Root Calculator
- Decimal to Fraction Calculator
- Decimal to Percent Calculator
- Decimal to Ratio Calculator
- Equivalent Fractions Calculator
- Fraction Calculator
- Fraction Simplifier
- Fraction to Decimal Calculator
- Fraction to Mixed Number Calculator
- Fraction to Percent Calculator
- Fraction to Ratio Calculator
- Greater Than Less Than Calculator
- Inch Fraction Calculator
- Least Common Denominator Calculator
- Least to Greatest Calculator
- Letters to Numbers Converter
- Long Division Calculator
- Mixed Number to Fraction Calculator
- Modulo Calculator
- Multiplication Calculator
- Percent Decrease Calculator
- Percent Difference Calculator
- Percent Error Calculator
- Percent Increase Calculator
- Percent Off Calculator
- Percent to Decimal Calculator
- Percent to Fraction Calculator
- Percent to Goal Calculator
- Percent to Ratio Calculator
- Percentage Calculator
- Percentage Change Calculator
- Percentage of a Percentage Calculator
- Ratio Calculator
- Ratio Percentage Calculator
- Ratio to Decimal Calculator
- Ratio to Fraction Calculator
- Reciprocal Calculator
- Remainder Calculator
- Reverse Percentage Calculator
- Root Calculator
- Round to the Nearest Cent
- Round to the Nearest Integer
- Round to the Nearest Thousand
- Rounding Calculator
- Scientific Notation Calculator
- Sig Fig Calculator
- Square Root Calculator
- Squaring Calculator
- Standard Notation Calculator
- Weighted Average Calculator
Charts
Chemistry
Electrical
Geometry
- 30-60-90 Triangle Calculator
- 45-45-90 Triangle Calculator
- Aquarium Tank Volume Calculator
- Arc Length Calculator
- Area Calculator
- Area of a Circle Calculator
- Area of a Trapezoid Calculator
- Chord Length Calculator
- Circle Calculator
- Circle Diameter Calculator
- Circle Equation Calculator
- Circle Perimeter Calculator
- Circle Segment Area Calculator
- Circumference Calculator
- Circumference to Diameter Calculator
- Circumference to Radius Calculator
- Cone Volume Calculator
- Cube Volume Calculator
- Cuboid Surface Area Calculator
- Cylinder Volume Calculator
- Diagonal Length Calculator
- Diagonal of a Rectangle Calculator
- Diameter to Radius Calculator
- Distance Between Two Points Calculator
- Ellipse Calculator
- Endpoint Calculator
- Equilateral Triangle Calculator
- Euclidean Distance Calculator
- Forty-Five Ninety Triangle Calculator
- Golden Ratio Calculator
- Hemisphere Surface Area Calculator
- Hexagon Calculator
- Hollow Cylinder Volume Calculator
- Hypotenuse Calculator
- Isosceles Triangle Calculator
- Midpoint Calculator
- Octagon Calculator
- Orthocenter Calculator
- Parallelogram Area Calculator
- Pentagon Calculator
- Perimeter Calculator
- Polygon Interior Angle Calculator
- Prism Volume Calculator
- Pyramid Volume Calculator
- Pythagorean Theorem Calculator
- Radius Calculator
- Rectangle Calculator
- Rectangular Prism Volume Calculator
- Regular Polygon Calculator
- Rhombus Calculator
- Right Triangle Area Calculator
- Right Triangle Calculator
- Right Triangle Side and Angle Calculator
- SAS Triangle Calculator
- Sector Area Calculator
- Sphere Volume Calculator
- Square Area Calculator
- Square Diagonal Calculator
- SSS Triangle Calculator
- Surface Area Calculator
- Surface Area of a Cylinder Calculator
- Torus Volume Calculator
- Triangle Area Calculator
- Triangle Calculator
- Triangle Centroid Calculator
- Triangle Height Calculator
- Triangle Perimeter Calculator
- Triangular Prism Volume Calculator
- Triangular Pyramid Volume Calculator
- Volume of a Hemisphere Calculator
Matrices
Number Theory
Trigonometry
- Angle of Depression Calculator
- Angle of Elevation Calculator
- Cosecant Calculator
- Cosine Calculator
- Cotangent Calculator
- Coterminal Angle Calculator
- Double Angle Calculator
- Half Angle Calculator
- Inverse Cosine Calculator
- Inverse Sine Calculator
- Inverse Tangent Calculator
- Inverse Trigonometry Calculator
- Law of Cosines Calculator
- Reference Angle Calculator
- Secant Calculator
- Sine Calculator
- Sine Rule Calculator
- SOHCAHTOA Calculator
- Tangent Calculator
- Trigonometry Calculator
- Unit Circle Calculator
Vectors
Volume
About math calculators
Math Calculators help you turn a question into a clear, checkable answer. Each tool lists its inputs, shows the formula it relies on and explains how to read the result.
Browse by topic using the filters, or search for a specific tool. Tools that are still being built are clearly marked as previews and are not presented as finished calculators.
Frequently asked questions
Are the math calculators calculators free?
Yes. Every calculator on Calculator Atlas is free to use and requires no sign-up.
How are results verified?
A calculator is only published after its formula has been implemented, tested against reference values and reviewed. Pages still in development are labeled as previews.