Fast, private, free web tools - no nonsense.
Calculate percentages, find X% of Y, percentage change
Simplify a ratio and see the reduced form
Calculate Body Mass Index from height and weight
Calculate WHR and risk category from waist and hip measurements
Convert temperature from Celsius to Fahrenheit
ASCII codes with decimal, hex, and character lookup
Convert decimal numbers to hexadecimal
Check if a number is prime and see a quick reason
Find the greatest common divisor and least common multiple
Generate random numbers within a range
Calculate simple interest and total amount