Math & Conversion
Percentages, statistics, GPA, and unit conversion.
26 calculators in this category.
- Percentage
Calculate percentage of a number, percentage change between two numbers, and what percent X is of Y. Fast, clean, and works with any values.
- Unit Converter
Convert between metric and imperial units for length, mass, volume, and temperature. Fast, accurate, and works with any value.
- Fractions
Add, subtract, multiply, and divide fractions. Shows simplified result and decimal equivalent. Handles mixed numbers.
- Statistics
Compute mean, median, mode, range, variance, and standard deviation from a list of numbers.
- Ratio
Simplify ratios, scale them to a target value, and convert ratios to decimals, percentages, and parts.
- Scientific
Online scientific calculator with trigonometric, logarithmic, exponential, and power functions. Works with degrees or radians.
- Quadratic
Solve ax² + bx + c = 0 using the quadratic formula. Shows both real and complex roots.
- Aspect Ratio
Calculate width or height for a target aspect ratio (16:9, 4:3, 1:1, 21:9). Useful for video, design, and screen sizing.
- Aquarium Volume
Calculate tank volume in gallons and liters from dimensions. Handles rectangular, bowfront, cylinder, and hexagon shapes.
- LCM & GCD
Calculate the GCD (greatest common divisor) and LCM (least common multiple) of any list of integers using Euclid's algorithm.
- Roman Numeral
Convert numbers to Roman numerals and back. Supports 1 through 3,999,999 using standard and vinculum notation.
- Base Converter
Convert between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Essential for programming, networking, and computer science.
- Color Converter
Convert colors between HEX, RGB, and HSL formats. Includes a live color preview for designers and developers.
- File Size
Convert between bytes, KB, MB, GB, TB, and PB using both binary (1024) and decimal (1000) conventions.
- Bandwidth
Convert internet speeds between Mbps and MB/s, plus calculate how long a file takes to download at any speed.
- Subnet
Calculate subnet mask, network address, broadcast, usable hosts, and IP range from any CIDR notation.
- Dice Probability
Calculate the probability of rolling at least, exactly, or at most a target sum with N dice of S sides.
- 2×2 Matrix
Compute determinant, inverse, trace, and eigenvalues of a 2×2 matrix.
- nPr / nCr
Calculate permutations (nPr) and combinations (nCr) — order matters vs doesn't.
- Prime Factors
Find prime factors of any integer up to 10¹². Returns expanded form and exponent form.
- Circle
Compute circle area, circumference, and diameter from any one of radius, diameter, area, or circumference.
- Triangle
Compute area and perimeter of any triangle from three sides using Heron's formula.
- Pythagorean
Solve for any side of a right triangle given the other two.
- Slope
Find the slope, y-intercept, and equation of the line through two points.
- Distance Formula
Compute Euclidean distance between two points in 2D or 3D space.
- Logarithm
Compute logarithms in any base — common (log₁₀), natural (ln), binary (log₂), or custom.