Math

Calculate the coefficient of variation (CV) from your dataset to easily assess relative dispersion and data volatility. Free online statistics calculator.

Free online point to line distance calculator. Quickly calculate the perpendicular distance from a point to a line using two-point or general equation (Ax+By+C=0) forms.

Quickly calculate the area of a kite using the lengths of its two diagonals. Ideal for students, teachers, and designers.

Enter the diagonal lengths of a rhombus to automatically calculate its area. Ideal for math studies and engineering measurements.

Quickly calculate sliding friction by entering the coefficient of friction and normal force. A free online kinetic friction calculator for physics and engineering.

Free online mass flow rate calculator. Enter density and volumetric flow rate to quickly calculate mass flow rate with automatic unit conversions.

Enter two values, a and b, to automatically calculate the difference of squares (a+b)(a-b) and simplify your algebraic calculations.

Calculate the minimum escape velocity from any celestial body's surface, with support for custom celestial parameters.

Input a set of positive numbers, one-click calculation of geometric mean, commonly used for average growth rate, investment return and other scenarios.

Quickly calculate the slope of a line by entering the coordinates of two points. Free online slope calculator for math and geometry.

Explore whole numbers from 2 to 20 as two parts. Adjust or swap the parts and connect the diagram, counters, and addition and subtraction facts.

Quickly convert ring sizes across Hong Kong, US, EU, UK, and Japan standards using your finger circumference or diameter, with measurement tips and common mistakes to avoid.

Enter coefficients a, b, and c to instantly calculate the real or complex roots of a quadratic equation.

Use ten-frames to explore make-ten addition. Split an addend, fill the first ten, and combine the remaining counters step by step.

Free online simple pendulum calculator. Calculate pendulum period and frequency based on length and gravity, or reverse-calculate length and acceleration of gravity.

Quickly expand (a±b)² algebraic expressions into standard polynomials. Ideal for math learning and verification.

Practice addition and subtraction that cross ten. Use visual ten-frames and method hints, then try a challenge without step-by-step help.

Free online average acceleration calculator. Quickly find acceleration using initial velocity, final velocity, and time with multiple unit support for fast, accurate results.

Evaluate (a+b)³ after entering numeric values for a and b.

Find relative positions on a school map. Choose a reference place, identify above, below, left, or right, and swap references to check the relationship.