Math calculators

Everyday arithmetic, algebra, and geometry — worked out clearly.

Percentages, fractions, ratios, geometry, and the little calculations that come up all the time — with formulas you can reuse anywhere.

Calculators
244
Topics: All Percentage (75) Fractions (4) Geometry (63)
244 results
Math / Geometry

Inverse Trigonometry Calculator

Compute the inverse-sine, inverse-cosine, and inverse-tangent of a value, returning the result in both radians and degre...

basic
1,596 4.4 1 min
Math / Percentage

Exponential Growth Calculator

Project a quantity that grows continuously at a constant rate r over time t, using the standard exponential growth model...

basic
16,873 4.9 1 min
Math / Percentage

Arithmetic Sequence Calculator

Compute the n-th term and the sum of the first n terms of an arithmetic sequence from its first term and common differen...

basic
15,534 4.9 1 min
Math / Geometry

Square Calculator

Get the area, perimeter, and diagonal of a square from its side length.

basic
8,870 4.2 1 min
Math / Percentage

Ratio Calculator

Solve for a missing term in a proportion, simplify ratios, or scale one ratio up or down.

basic
2,927 4.1 1 min
Math / Fractions

LCM Calculator

Find the least common multiple of two or more whole numbers, with the full prime-factor breakdown.

basic
17,192 4.5 1 min
Math / Percentage

Geometric Sequence Calculator

Compute the n-th term and the sum of the first n terms of a geometric sequence from its first term and common ratio.

basic
2,619 4.8 1 min
Math / Percentage

Exponential Decay Calculator

Compute the remaining quantity after time t for an exponentially decaying process N(t) = N₀ · e⁻ᵏᵗ, plus the half-life.

basic
2,092 4.5 1 min
Math / Geometry

Sector Area Calculator

Compute the area of a circular sector ("pie slice") from the radius and the central angle in degrees.

basic
1,865 4.2 1 min
Math / Percentage

Percent Change Calculator

Compute the percent change between an old value and a new value, with the absolute difference and direction.

basic
23,974 4.2 1 min
Math / Geometry

Arc Length Calculator

Compute the arc length of a circle from the radius and the central angle in degrees.

basic
20,217 3.9 1 min
Math / Fractions

GCF Calculator

Find the greatest common factor (also called GCD) of any list of whole numbers using the Euclidean algorithm.

basic
17,756 4.3 1 min
Math / Geometry

Trapezoid Area Calculator

Calculate the area of a trapezoid given the lengths of its two parallel bases and the perpendicular height between them.

basic
3,113 4.5 1 min
Math / Percentage

Percent Error Calculator

Compute the percent error between an experimental measurement and the accepted theoretical value.

basic
5,045 4.7 1 min
Math / Geometry

Cone Volume Calculator

Compute the volume, slant height, and lateral surface area of a right circular cone from its radius and height.

basic
372 4.9 1 min
Math / Geometry

Hexagon Calculator

Compute the area, perimeter, long diagonal, and short diagonal of a regular hexagon from any side length.

basic
22,641 4.7 1 min