13 free tools

Education tools

Solve grades, probability, number theory, and classroom calculations.

Calculate a percentage and letter grade from points earned and possible.

Calculate weighted GPA from course grades and credit hours.

Find a weighted mean from paired values and weights.

Find the greatest common divisor of two or more integers.

Find the least common multiple of two or more integers.

Calculate ordered permutations and unordered combinations.

Calculate event probability, complement, odds, and percentage.

Convert between positive integers and standard Roman numerals.

Round numbers to decimal places, significant figures, or a chosen increment.

Count significant figures and round a value to the required precision.

Solve a one-variable equation in the form ax + b = c.

Calculate slope, intercept, distance, and equation from two points.

Estimate survey sample size from confidence level, margin of error, and population.