Free Online Math & Calculators Tools

Free online percentage calculation tool, supports multiple calculation modes such as percentage calculation, percentage increase/decrease, percentage difference, etc. Real-time calculation results, save calculation history, suitable for financial analysis, data statistics, discount calculation, growth rate calculation and other scenarios, with a simple and easy-to-use interface.

Free online random number generation tool, supports generating random integers, floating-point numbers, Gaussian distribution random numbers, and random arrays. Provides pseudo-random and cryptographically secure random number modes, supports batch generation, sorting, deduplication and other features, suitable for lucky draws, password generation, scientific computing and other scenarios.

Free online proportion calculation tool, supports basic proportion calculation, multi-value ratio simplification, proportional scaling of dimensions, percentage calculation, fraction calculation. Suitable for design, photography, video production and other scenarios, helps quickly calculate aspect ratios, scaling ratios, etc.

Free online volume calculation tool, supports volume calculation of 8 common geometric shapes: cube, cuboid, sphere, cylinder, cone, triangular prism, quadrangular pyramid, and torus. Enter geometric parameters to automatically calculate volume, surface area and other data, supports multiple unit conversions, simple and easy-to-use interface.

Free online perimeter calculation tool, supports perimeter calculation of 7 common geometric shapes: square, rectangle, triangle, circle, ellipse, regular polygon, and trapezoid. Enter shape parameters to automatically calculate the perimeter, supports multiple length unit conversions.

Free online area calculation tool, supports area calculation of 10 geometric shapes: square, rectangle, triangle, circle, ellipse, trapezoid, parallelogram, rhombus, sector, and regular polygon. Enter shape parameters to automatically calculate the area, supports multiple area unit conversions.

Free online surface area calculation tool, supports surface area calculation of 14 geometric solids: cube, cuboid, sphere, cylinder, cone, frustum, spherical cap, spherical segment, regular tetrahedron, regular hexahedron, regular prism, regular pyramid, torus, and ellipsoid, supports multiple unit conversions.

Free online Pi query tool, supports querying digits at any position after the decimal point of π, viewing the first N digits of π, searching for the position of digit sequences in π, counting digit distribution, and other functions. Provides the first 10000 digits of π with high precision.

Free online equation solver supporting linear equations, quadratic equations, cubic equations, systems of linear equations, and custom equations. Provides detailed solution steps and multiple solving methods.

Free online factorization calculator supporting common factor extraction, difference of squares, perfect square formula, cross multiplication, grouping method, sum/difference of cubes and more.

Free online scientific calculator supporting trigonometric functions, logarithms, exponents, factorials, and power operations. Supports angle/radian toggle with high-precision results.

Free online triangle calculator supporting SSS, SAS, ASA, AAS, SSA calculations. Calculate triangle sides, angles, area, perimeter, altitudes, medians, angle bisectors with real-time visualization.

Free online circle and arc calculator. Calculate circle parameters from radius, diameter, circumference, or area. Calculate arc length, chord length, sector area, and segment area from various combinations of known values.

Free online coordinate geometry calculator supporting distance between two points, midpoint, slope calculation, line equation, point-to-line distance, triangle calculations, circle calculations, and coordinate conversion.

Free online probability calculator supporting basic probability, combinatorics, conditional probability, probability distributions, and expected value calculations. Includes permutations, combinations, binomial distribution, normal distribution, Poisson distribution, Bayes theorem, and more.

Free online descriptive statistics analysis tool. Supports mean, median, mode, variance, standard deviation, skewness, kurtosis and more. Provides histogram, box plot, trend chart and other data visualization charts.

Free online shopping calculator supporting discount calculation, threshold reduction, tax calculation, and price comparison. Quickly calculate product discounts, promotional savings, tax amounts, and compare product value across different sizes.

Free online multiplication table learning tool, supporting full table view, single-number practice, random quiz, and recitation modes. Interactive table with cross-highlighting helps students master multiplication facts quickly.

Free online resistor color code calculator supporting 4-band, 5-band and 6-band resistor value reading and identification. Quickly calculate resistance, tolerance and temperature coefficient by selecting band colors.

Free online Cron expression generator and parser tool. Visually create cron expressions for scheduled tasks, parse and understand cron syntax, and preview upcoming execution times. Supports Linux Crontab, Spring Scheduled, Quartz and more.

Free online compound interest calculator supporting future value calculation, regular contributions, and yearly growth breakdown. Supports multiple compounding frequencies (daily/monthly/quarterly/semi-annually/annually) with automatic growth charts. Perfect for financial planning, retirement calculation, and education fund planning.

Free online GPA calculator supporting 4.0, 4.3, 5.0 grading scales. Add multiple courses and calculate weighted average GPA. Perfect for domestic and international grade conversion.

Free online matrix calculator supporting addition, subtraction, multiplication, scalar multiplication, determinant, inverse, transpose, rank, trace, matrix power, eigenvalues/eigenvectors, LU decomposition, QR decomposition and more.

Free online chemical equation balancer. Input any chemical reaction equation and automatically calculate the balancing coefficients. Ideal for chemistry education and research.

Free online molar mass calculator. Enter a chemical formula (e.g. H₂SO₄, C₆H₁₂O₆) to calculate molar mass with detailed elemental breakdown. Perfect for chemistry students, lab work, and scientific research.

Free online trigonometry calculator. Compute sin, cos, tan, cot, sec, csc and inverse trigonometric functions. Supports degrees and radians input, real-time calculation results, and one-click copy.

Free online logarithm and exponential calculator. Supports natural log (ln), common log (log₁₀), binary log (log₂), and log/exponential operations with any base. Real-time calculation with up to 10 decimal places. Perfect for math learning, scientific computing, and engineering applications.

Free online fraction simplifier and comparator tool. Supports fraction reduction, comparison, and addition, subtraction, multiplication, division operations. Enter two fractions to automatically simplify and compare them, with four basic arithmetic operations results displayed. Perfect for math learning and daily calculations.

Free online Ohm's Law calculator for real-time calculation of Voltage (V), Current (I), Resistance (R), and Power (P). Enter any two known parameters to automatically calculate the remaining values. Supports unit conversion (mV, V, kV, mA, A, kA, mΩ, Ω, kΩ, MΩ, mW, W, kW). Perfect for circuit design, electronic engineering, and physics learning.