Math & Conversion

Calculate percentage of a number, percentage change between two numbers, and what percent X is of Y. Fast, clean, and works with any values.

Convert between metric and imperial units for length, mass, volume, and temperature. Fast, accurate, and works with any value.

Add, subtract, multiply, and divide fractions. Shows simplified result and decimal equivalent. Handles mixed numbers.

Compute mean, median, mode, range, variance, and standard deviation from a list of numbers.

Simplify ratios, scale them to a target value, and convert ratios to decimals, percentages, and parts.

Online scientific calculator with trigonometric, logarithmic, exponential, and power functions. Works with degrees or radians.

Solve ax² + bx + c = 0 using the quadratic formula. Shows both real and complex roots.

Calculate width or height for a target aspect ratio (16:9, 4:3, 1:1, 21:9). Useful for video, design, and screen sizing.

Calculate tank volume in gallons and liters from dimensions. Handles rectangular, bowfront, cylinder, and hexagon shapes.

Calculate the GCD (greatest common divisor) and LCM (least common multiple) of any list of integers using Euclid's algorithm.

Convert numbers to Roman numerals and back. Supports 1 through 3,999,999 using standard and vinculum notation.

Convert between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Essential for programming, networking, and computer science.

Convert colors between HEX, RGB, and HSL formats. Includes a live color preview for designers and developers.

Convert between bytes, KB, MB, GB, TB, and PB using both binary (1024) and decimal (1000) conventions.

Convert internet speeds between Mbps and MB/s, plus calculate how long a file takes to download at any speed.

Calculate subnet mask, network address, broadcast, usable hosts, and IP range from any CIDR notation.

Calculate the probability of rolling at least, exactly, or at most a target sum with N dice of S sides.

Compute determinant, inverse, trace, and eigenvalues of a 2×2 matrix.

Calculate permutations (nPr) and combinations (nCr) — order matters vs doesn't.

Find prime factors of any integer up to 10¹². Returns expanded form and exponent form.

Compute circle area, circumference, and diameter from any one of radius, diameter, area, or circumference.

Compute area and perimeter of any triangle from three sides using Heron's formula.

Solve for any side of a right triangle given the other two.

Find the slope, y-intercept, and equation of the line through two points.

Compute Euclidean distance between two points in 2D or 3D space.

Compute logarithms in any base — common (log₁₀), natural (ln), binary (log₂), or custom.