Generate arithmetic or geometric sequences from a starting value and step or ratio.
Arithmetic sequences add a constant difference. Geometric sequences multiply by a constant ratio.
Arithmetic term n: aₙ = a₁ + (n − 1)d. Geometric term n: aₙ = a₁r^(n − 1).
Calculate area for rectangles, squares, triangles, circles, and trapezoids.
Open calculator Calculator Average CalculatorCalculate mean, median, minimum, maximum, range, and count from a list of numbers.
Open calculator Calculator Circle CalculatorCalculate circle area, circumference, and diameter from radius.
Open calculator Calculator Decimal to Fraction CalculatorConvert a decimal number into a simplified fraction.
Open calculatorQuick formulas for speed, work rate, density, and other quantity-per-unit relationships.
Explore Visualizers Fraction VisualizerSee a fraction as filled parts of a whole and compare its decimal and percentage forms.
Explore Visualizers Coordinate Plane VisualizerPlot a list of x,y coordinate points on an automatically scaled Cartesian plane.
Explore References Percentage Formula ReferenceA compact reference for percent-of, what-percent, percentage change, and reverse-percentage formulas.
Explore