Yes. A zero slope describes a horizontal line. It occurs when two distinct points have the same y-coordinate.

Can I calculate slope with negative or decimal coordinates?

Yes. The calculator accepts positive numbers, negative numbers, zero, and decimal coordinates for both points.

Free Math Tool

Slope Calculator

Q: What is the formula for slope?

The slope formula is m = (y2 - y1) / (x2 - x1). It divides the vertical change, called rise, by the horizontal change, called run.

Q: What does a positive slope mean?

A positive slope means the line rises as it moves from left to right. A slope of 2 means the line rises 2 units for each 1 unit of horizontal movement.

Q: What is an undefined slope?

A slope is undefined when two distinct points have the same x-coordinate. The run is zero, so the slope formula would require division by zero, and the resulting line is vertical.

Use this free slope calculator to find the slope between two points. Enter x1, y1, x2, and y2 to see the rise, run, line angle, equation, slope type, and step-by-step calculation instantly.

Enter Two Points

First x-coordinate (x1)

First y-coordinate (y1)

Second x-coordinate (x2)

Second y-coordinate (y2)

Formula: m = (y2 - y1) / (x2 - x1), also called rise over run. Negative values, zero, and decimal coordinates are supported.

Slope Result

Enter both coordinate points and select Calculate Slope to see the result.

How to read the result:
A positive slope rises from left to right, a negative slope falls, a zero slope is horizontal, and an undefined slope is vertical.

What Is Slope?

Slope measures the steepness and direction of a straight line. It shows how much the line's vertical position changes for each unit of horizontal movement. In algebra, slope is usually represented by the letter m.

The vertical change between two points is the rise, while the horizontal change is the run. Dividing rise by run gives the line's slope.

How to Calculate Slope

Choose two different points: (x1, y1) and (x2, y2).
Find the rise by subtracting y1 from y2.
Find the run by subtracting x1 from x2.
Divide the rise by the run: m = rise / run.

Example: For (2, 4) and (8, 10), rise = 10 - 4 = 6 and run = 8 - 2 = 6. Therefore, the slope is 6 / 6 = 1.

Types of Slope

Positive slope: The line rises from left to right.
Negative slope: The line falls from left to right.
Zero slope: The line is horizontal and both y-values are equal.
Undefined slope: The line is vertical and both x-values are equal.

What the Calculator Shows

Decimal slope and a simplified fraction when possible.
Rise, run, slope type, and inclination angle.
The equation of the line in y = mx + b form.
Substitution and calculation steps for checking your work.

Frequently Asked Questions

What is the formula for slope?

What does a positive slope mean?

What is an undefined slope?

Can slope be zero?

Can I use negative or decimal coordinates?