All Online Tools & Free Calculators

Convert between Roman numerals and Arabic numbers with step-by-step arithmetic breakdown.

Calculate percentage decrease, percent reduction, markdown discounts, and relative drop.

Calculate the exact percentage change, relative growth delta, and difference between an initial and final value.

Calculate percentage values, percentage of totals, and relative percentage comparisons.

Find the median, mean, mode, quartiles Q1/Q3, IQR, and statistical outliers for any dataset.

Find the mode, frequency distribution, unimodal/bimodal status, and companion mean/median.

Add, subtract, multiply, and divide fractions and mixed numbers with step-by-step simplification to simplest terms.

Calculate circle radius, diameter, circumference, and area from any single known circular parameter instantly.

Calculate right triangle hypotenuse and leg lengths using the Pythagorean Theorem.

Solve quadratic equations ax² + bx + c = 0, find real and complex roots, discriminant, and parabola vertex.

Calculate the total number of unordered combinations (nCr) of choosing r elements from a set of n items.

Calculate the total number of ordered permutations (nPr) of choosing r elements from a set of n items.

Calculate all factors, factor pairs, divisor counts, and prime factorization of any positive integer instantly.

Check if a number is prime or composite, discover its divisors, and find neighboring prime numbers.

Calculate the Least Common Multiple (LCM / LCD) of any set of numbers with step-by-step prime factorization breakdowns.

Convert proper fractions, improper fractions, and mixed numbers into exact decimal numbers and percentages.

Convert decimal numbers into exact proper fractions, improper fractions, or mixed numbers in simplest terms.

High-precision mean calculator for computing arithmetic, geometric, harmonic, and RMS averages with detailed statistical dispersion metrics.

Calculate the arithmetic mean, median, mode, geometric mean, sum, and statistical range from a set of numbers.

Calculate percentage increase, percent growth, and relative difference between two values.

Calculate the final discounted price, total savings, and post-tax total from original price and discount percentages.

Solve proportions A:B = C:D for missing variable X, simplify ratios, scale recipes, and identify aspect ratios.

Solve proportions (A/B = C/D) and find missing values with step-by-step cross-multiplication.

Calculate square roots, cube roots, and nth roots with simplified radical form and decimal precision.