Free Educational Calculators With Steps

Find one missing side of a right triangle and see the formula, substitution and result.

Solve an SSS triangle from three side lengths to find its angles, perimeter and area with steps.

Solve coordinate geometry problems with slope, distance, midpoint, line equations and intersections, then prove rectangles and rhombuses step by step.

Choose a constant-acceleration equation from three known variables and solve for a selected unknown.

Calculate an ideal projectile’s velocity components, flight time, maximum height and horizontal range.

Find voltage, current or resistance from two known quantities using V = IR and show the rearrangement.

Choose the right kinematics equation from the variables you know, then follow worked constant-acceleration examples with signs, units and checks.

Calculate sample or population standard deviation, variance, mean and standard error with a deviation table.

Find the mean, median and all modes of a numeric dataset with sorted data and calculation steps.

Standardize a value using a supplied mean and standard deviation and interpret its distance from the mean.

Find a two-sided z confidence interval for a mean when the population standard deviation is known.

Calculate standard deviation by hand in six steps with contextual data, and learn exactly when to divide by N or n−1.