Utilities

Find a percent of a number.

Measure the change between two numbers.

Simplify two numbers as a ratio.

Calculate a tip and the total bill.

Apply a percent discount.

Convert length, weight, temperature, speed, area, volume and data sizes.

Convert metric and imperial lengths, from nanometers to miles.

Convert grams, kilograms, pounds, ounces, stones and tons.

Convert Celsius, Fahrenheit and Kelvin in either direction.

Convert bits, bytes and decimal or binary storage units.

Count days between two dates.

Count years from a birth date to today.

Calculate body mass from kilograms and meters.

Estimate a monthly loan payment.

Pick a random integer in a range.

Roll a six-sided die.

Reduce a width and height to a ratio.

Convert pixels and inches into DPI.

Add two minute counts.

Convert meters per second, km/h, mph, feet per second and knots.

Convert metric and imperial areas, acres and hectares.

Convert liters, cubic units, and US or imperial volumes.

Check primality, list prime factors and find the next prime.

Find the greatest common divisor and least common multiple.

Calculate an exact factorial, including large integer results.

Calculate powers and real nth roots.

Calculate a logarithm in any positive base, including e and 2.

Compare modulo, remainder and truncated integer quotient.

Solve a quadratic with real or complex roots, or a degenerate linear equation.

Add, subtract, multiply or divide exact fractions.

Average values with a separate weight for each one.

Solve a:b = c:x and simplify the original ratio.

Compare the price per unit of two packs.

Calculate megapixels, aspect ratio and optional pixel density.

Add durations and export the total in ISO 8601 form.

Count weekdays between two dates, excluding holidays you provide.

Find the date a number of calendar days before or after another.