Whether you’re a student working through coordinate geometry, an engineer designing a drainage system, or a contractor calculating a ramp gradient — knowing how to find the slope of a line is a fundamental skill.
Slope Calculator takes the manual work out of the equation. Enter just two coordinate points and instantly receive the slope, line equation, rise, run, distance, angle, slope percentage, and more — all supported by a live interactive graph that updates in real time.
The Basics
What Is Slope?
Slope measures how steep a line is — how much it rises or falls as it moves horizontally. In mathematics, it is defined as rise over run: the vertical change divided by the horizontal change between two points on a line. You may also hear slope referred to as gradient, particularly in engineering, geography, and construction. Both terms describe the same concept.
Slope Types at a Glance
- Positive slopes — the line rises from left to right
- Negative slopes — the line falls from left to right
- Zero slope — a perfectly horizontal line
- Undefined slope — a perfectly vertical line
Rise Over Run: The Core Idea
Every slope is built from two simple measurements: Δy (vertical change, the rise) and Δx (horizontal change, the run). Divide the rise by the run and you get the slope — the steeper the line, the larger the number.
What Is Slope Percentage?
Slope percentage expresses the slope as a percentage, showing how many units a surface rises per 100 units of horizontal distance. An 8% slope means the line rises 8 units for every 100 units traveled — a standard figure used in road and ramp engineering.
