Tools Directory

Calculators

• Percentage Calculator

  Calculate percentages online free. Find percentage of a number, what percent is X of Y, and percentage increase/decrease.

• Rule of Three Calculator

  Calculate proportions with the rule of three. Free online calculator for direct and inverse proportionality problems.

• Average Calculator

  Calculate the average (arithmetic mean) of any set of numbers instantly. Free online calculator for grades, expenses, statistics, and data analysis.

• Fraction to Decimal Converter

  Convert fractions to decimals instantly. Free online converter for math homework, engineering, and everyday use.

• Percentage Change Calculator

  Calculate the percentage change between two values to see how much something has increased or decreased.

• BMI Calculator

  Calculate your Body Mass Index (BMI) instantly with our free online calculator. Supports metric (kg, cm) and imperial (lb, ft/in) units. Get your BMI value and WHO classification for adults—underweight, normal, overweight, or obese—in one click.

• GCD / LCM Calculator

  Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more numbers. Our free online calculator uses Euclid's algorithm for GCD and supports 2 to 6 numbers. Enter your values and get instant results for GCD, LCM, or both.