From basic arithmetic to high-level academic calculators and randomization tools. Average Calculator Mean, median, mode, std dev and more for any data set. Statistics Calculator Full stats: mean, median, mode, variance, IQR, quartiles. Percentage Calculator What is X% of Y? Find percentage change instantly. Binary & Hex Converter Convert between binary, decimal, hexadecimal and octal. Ratio Calculator Simplify ratios, solve proportions and scale values. Circle Calculator Area, circumference, diameter and radius from any one value. Quadratic Equation Solver Solve ax²+bx+c=0 with roots, vertex and discriminant. LCM & GCD Calculator Find Least Common Multiple and Greatest Common Divisor. Roman Numeral Converter Convert numbers to Roman numerals and back. Fraction Calculator Add, subtract, multiply, and divide fractions with steps. Ohm's Law Calculator Calculate voltage, current, resistance and power. Power-to-Weight Calculator Power-to-weight ratio for vehicles and engines. Half-Life Calculator Calculate radioactive decay and remaining quantity. Speed, Distance & Time Calculate any one from two known values. Time Calculator Add, subtract and find differences between times. Square Footage Calculator

Calculate area of any room or space in sq ft and sq m. Calculate exact age in years, months, days and weeks. Date Calculator Difference between dates or add/subtract days from any date. Scientific Calculator Full scientific calculator with trig, log, powers and more. Calculate semester and cumulative GPA on a 4.0 scale. Grade Calculator Weighted average grade and letter grade across all assignments. Random Number Generator Generate random numbers in any range. Permutation & Combination Calculator Calculate nPr (permutations) and nCr (combinations) with step-by-step breakdown. Matrix Calculator Add, subtract, multiply, determinant, inverse, and transpose for 2×2 and 3×3 matrices. Z-Score Calculator Calculate z-scores and standard normal distribution probabilities. Confidence Interval Calculator Calculate CIs for a population mean at 80–99.9% confidence levels. Number Base Converter Convert between binary, octal, decimal, and hexadecimal. Triangle Calculator Solve any triangle from SSS, SAS, ASA, AAS, or SSA. All sides, angles, area, perimeter. Prime Number Checker Check primality and get prime factorization for any number. Fibonacci Generator Generate up to 100 Fibonacci numbers and explore the golden ratio. Density Calculator Calculate density, mass, or volume with unit conversion and materials table. Torque Calculator Calculate torque, force, or moment arm with angle support. Significant Figures Calculator Round to N significant figures with digit highlighting.