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.