Math

Use our Slope Calculator to find slope, angle, percent grade, line equation, y-intercept, rise/run, and distance using two points or other methods.

Use our Square Root Calculator to find the principal square root of a number or reverse-calculate x from a square root value.

Use our Significant Figures Calculator to count sig figs, round numbers or expressions, and show decimal, scientific, and E notation.

Find the percentage increase between two numbers. Enter original and new values to get % increase, change amount, and final value. Reverse solve from % too. Instant steps & PDF.

Use our Circumference Calculator to find circle radius, diameter, circumference, and area from any one known value with unit conversions.