Math & Conversions

Calculate percentages instantly. Find X% of Y, what percent X is of Y, or percent change between two numbers.

Convert between metric and imperial units. Length, area, volume, weight, and temperature instantly.

Add, subtract, multiply, and divide fractions. Simplify results, convert between mixed numbers and decimals instantly.

Calculate sale price after discount, find the discount percentage between two prices, or stack multiple discounts. Includes tax estimate.

Calculate mean, median, mode, range, sum, and count. Enter your numbers separated by commas or one per line.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine. Enter a value in any scale and see all conversions instantly.

Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values and get the other two instantly.

Calculate pH, pOH, H⁺ concentration, and OH⁻ concentration. Enter any one value and get all related values instantly.

Calculate your weighted GPA from course grades and credit hours. Supports 4.0 scale with letter grades A through F.

Generate random numbers between any range. Single or multiple, integers or decimals, with optional no-repeat mode.

Calculate permutations P(n,r) and combinations C(n,r). With step-by-step factorial breakdown and real-world examples.

Find the missing side of a right triangle. Enter any two sides and get the third, with angle calculations and visual diagram.

Calculate DPI, PPI, print size, and pixel dimensions. Convert between resolution, physical size, and pixel count.

Calculate, convert, and scale aspect ratios. Find missing dimensions, simplify ratios, and resize images proportionally.

Convert between binary, decimal, octal, and hexadecimal. Instant number system conversion.

Estimate file download time based on file size and internet speed. Supports all common units.

Convert between standard and scientific notation. Supports E notation, engineering notation, and large/small numbers.

Calculate Greatest Common Divisor and Least Common Multiple. Supports multiple numbers with step-by-step solution.

Convert between data storage units. Bits, bytes, KB, MB, GB, TB, PB with binary and decimal options.

Find all factors, prime factorization, factor pairs, and divisor properties of any positive integer.

Convert any number to its written form in words. Supports integers, decimals, and negative numbers.

Calculate golden ratio proportions. Enter any segment to find the matching values based on φ ≈ 1.6180339887.

Calculate square roots, cube roots, and nth roots of any number. Shows simplified radical form and step-by-step prime factorization.

Calculate percent error, absolute error, and relative error between experimental and theoretical values.

Round numbers to any decimal place or significant figure. Supports 6 rounding modes: half-up, half-down, half-even, ceiling, floor, and truncation.

Convert light years to kilometers, miles, AU, and parsecs. Calculate travel time at light speed, spacecraft, jet, and car speeds.

Solve any triangle from 3 sides, 2 sides + angle, or 2 angles + side. Get all angles, area, perimeter, heights, and triangle type.

Free online scientific calculator with trigonometric, logarithmic, exponential and factorial functions. Supports degree/radian, memory, parentheses and history.

Solve quadratic equations ax² + bx + c = 0. Find real and complex roots, discriminant, vertex, axis of symmetry, and step-by-step solution.

Calculate pixels per inch for any monitor or screen. Enter diagonal and resolution to get PPI, dot pitch, physical dimensions, and sharpness class.

Calculate IPv4 subnet details from any IP and CIDR or subnet mask. Get network address, broadcast, host range, wildcard mask, usable hosts, and binary view.

Calculate radioactive and exponential decay. Solve for remaining amount, initial amount, elapsed time or half-life with 12 built-in isotopes.

Calculate the volume of 10 shapes including cube, sphere, cylinder, cone, and pyramid. Metric and imperial units with liters and gallons conversion.

Add, subtract, multiply matrices and find the determinant, transpose, inverse, trace, and rank. Supports sizes from 1x1 to 4x4.

Calculate log base 10, natural log (ln), log base 2, or any custom base, plus the antilogarithm. Shows the formula and exact result.

Calculate the area of 10 shapes including square, rectangle, triangle, circle, and polygon. Metric and imperial units with square-unit conversions.

Calculate the perimeter of 10 shapes including square, rectangle, triangle, circle, and polygon. Metric and imperial units with conversions.

Calculate the Pearson correlation coefficient (r) between two data sets. See r squared, strength interpretation, and means.

Find the best-fit line (y = mx + b) for two data sets. Get slope, intercept, r, r squared, and predictions using least squares.