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Basic Calculator Enter a math expression and calculate it with standard operation order. Scientific Calculator Calculate powers, roots, logs and trigonometry with degree or radian mode. Percentage Calculator Calculate percentages, percent change and percentage difference without setting up the formula by hand. Percentage Change Calculator Find the percent increase or decrease from an old value to a new value. Percentage Increase Calculator Increase a number by a percent and see the added amount and final value. Percentage Difference Calculator Compare two values and find their percentage difference without choosing a starting value. Fraction Calculator Add, subtract, multiply and divide fractions with simplified results. Mixed Number Calculator Add, subtract, multiply or divide mixed numbers and get a simplified result. Ratio Calculator Simplify a ratio and compare two values in the smallest whole-number form. Proportion Calculator Solve a simple proportion and find the missing value in a:b = c:x. Average Calculator Find the average of a list of numbers and see the count and sum. Mean Median Mode Calculator Find mean, median and mode for a set of numbers in one place. Standard Deviation Calculator Calculate sample or population standard deviation from a list of numbers. Random Number Generator Generate one or more random integers inside a chosen range. Rounding Calculator Round numbers to decimal places or significant figures. Scientific Notation Calculator Convert large or small numbers into scientific notation. Square Root Calculator Find the principal square root of a non-negative number. Exponent Calculator Raise a base number to any exponent and see the power result. Logarithm Calculator Find a logarithm with any positive base other than 1. Factorial Calculator Calculate n factorial for whole numbers and understand what n! means. GCF Calculator Find the greatest common factor of two or more whole numbers. LCM Calculator Find the least common multiple of two or more whole numbers. Prime Factorization Calculator Break a whole number into prime factors. Modulo Calculator Find the remainder after division, including a non-negative modulo result. Age Calculator Calculate exact age in years, months and days from a birth date to any target date. Date Calculator Add or subtract days, weeks, months and years from any date. Days Between Dates Calculator Count calendar days or business days between two dates. Time Duration Calculator Calculate elapsed hours and minutes between two times, including overnight ranges. Hours Calculator Calculate work hours between start and end times with break minutes. Hours and Minutes Calculator Add or subtract hours and minutes without converting by hand. Time to Decimal Calculator Convert hours and minutes into decimal hours. Time Zone Converter Convert a date and time from one time zone to another. Week Number Calculator Find the week number for a date using ISO or US-style week counting. Leap Year Calculator Check whether a year is a leap year under Gregorian calendar rules. Military Time Converter Convert between 12-hour time and 24-hour military time. Unix Timestamp Converter Convert Unix timestamps to dates and dates back to Unix time. Unit Converter Convert common length, weight, speed and storage units from one value to another. Length Converter Convert length units such as meters, feet, inches, kilometers and miles. Weight Converter Convert weight and mass units such as pounds, kilograms, ounces and stones. Temperature Converter Convert temperatures between Celsius, Fahrenheit and Kelvin. Speed Converter Convert speeds between mph, km/h, m/s, knots and ft/s. Data Storage Converter Convert bytes, KB, MB, GB, TB and binary units such as KiB and GiB. Area Calculator Calculate area for common shapes such as rectangles, triangles, circles and trapezoids. Volume Calculator Calculate volume for boxes, cubes, cylinders, spheres and cones. Square Footage Calculator Calculate square footage for rectangles, L-shapes, circles, triangles and borders, with cost and waste. GPA Calculator Calculate GPA from course grades and credit hours using a standard grade point scale. Grade Calculator Calculate a grade percentage from points earned and points possible. Final Grade Calculator Find the score needed on a final exam to reach a target course grade. Tip Calculator Calculate tip, total bill and split amount with pre-tax or post-tax tipping. Discount Calculator Calculate sale price, savings and effective discount after one or two percent discounts. Sales Tax Calculator Add sales tax to a price or back the tax out of a total using your local rate. Markup Calculator Price products from cost and markup, or find the markup and margin in an existing price. Percent Error Calculator Compare a measured value with the accepted value and get the percent error. Days Until Calculator Count the days from today to any future date, with weeks and business days. Circle Calculator Enter any one of radius, diameter, circumference or area and get the other three. Pythagorean Theorem Calculator Find the hypotenuse from two legs, or a missing leg from the hypotenuse, of a right triangle. Quadratic Formula Calculator Solve any quadratic equation and get real or complex roots, the discriminant and the vertex. Slope Calculator Find the slope, line equation, angle and distance from two points on a line. Number Base Converter Convert a number between binary, octal, decimal and hexadecimal in one step. Roman Numeral Converter Convert numbers to Roman numerals and Roman numerals back to numbers. Permutation and Combination Calculator Calculate permutations (nPr) and combinations (nCr) for n items taken r at a time.