Line Calculator

Find the equation of a line step by step

This calculator will find the equation of a line (in the slope-intercept, point-slope, and general forms) given two points or the slope and one point, with steps shown.

Related calculators: Slope Calculator, Parallel and Perpendicular Line Calculator

Choose type:

Enter two points or

Point 1: (, )

Point 2: (, )

Enter a slope and a point or


Point: (, )

If slope is infinite or undefined, write inf.
If you need to find a parallel or perpendicular line, use the parallel and perpendicular line calculator.
To find a slope, use the slope calculator.

If the calculator did not compute something or you have identified an error, or you have a suggestion/feedback, please write it in the comments below.

Introducing the Line Calculator, a tool for quickly and accurately finding line equations. Tailored for students, educators, engineers, and math enthusiasts, it helps to calculate line equations with no effort.

How to Use the Line Calculator?

  • Input

    Select the type of your data. You can opt for slope and point, or two points. Depending on the chosen type, enter the required inputs. Double-check your inputs to ensure accuracy.

  • Calculation

    Click the "Calculate" button to find the equation of the line based on the provided inputs.

  • Result

    The calculator will immediately show the calculated line equation. It will also provide step-by-step explanations to help you understand the process.

What Is the Equation of a Line?

The equation of a line is a fundamental concept in algebra that represents a straight line on a coordinate plane. It provides a mathematical description of how the line behaves.

What Is the Equation of a Line?

There are different forms of equations of lines that are used to represent linear relationships on a coordinate plane. Each form serves specific purposes and offers insights into a line's characteristics and behavior. Let's explore these forms in more detail.

  • Slope-Intercept Form

    This widely-used form represents a line's equation using its slope $$$m$$$ and y-intercept $$$b$$$. The slope determines the line's steepness, while the y-intercept indicates where the line crosses the y-axis. The equation of a line in the slope-intercept form is


    Example: Consider a line with a slope of $$$2$$$ and a y-intercept of $$$3$$$. Its equation would be $$$y=2x+3$$$. This means that for every unit increase in $$$x$$$, $$$y$$$ increases by $$$2$$$ units, and the line crosses the y-axis at the point $$$(0,3)$$$.

  • Point-Slope Form

    In this form, the equation of a line is expressed using its slope $$$m$$$ a specific point $$$\left(x_1,y_1\right)$$$. This form is useful when you know a point on the line and its slope but not the y-intercept. The equation of a line in the point-slope form is


    Example: Given a line passing through the point $$$(2,5)$$$ with a slope of $$$3$$$, its equation in the point-slope form is $$$y-5=3(x-2)$$$. This form allows you to quickly write the equation without needing the y-intercept.

  • General Form

    The general form is another representation of the equation of a line. It involves coefficients $$$A$$$, $$$B$$$, and $$$C$$$, which can be real numbers. This form is especially suitable for describing vertical lines and allows for greater flexibility in representing linear equations. The equation of a line in the general form is


    Example: Suppose you have a line with $$$A=2$$$, $$$B=-3$$$, $$$C=6$$$. Its equation in the general form is $$$2x-3y=6$$$.

Why Choose Our Line Calculator?

  • Intuitive User Interface

    Designed keeping simplicity and efficiency in mind, the interface ensures you spend less time figuring out how to use the tool and more on understanding the results.

  • Versatility

    The calculator accepts different types of input data and outputs all common forms of the equation of a line. It is a one-stop solution for all your line equation problems.

  • Accuracy Assured

    Our sophisticated algorithm ensures that you receive precise results every single time.

  • Step-by-Step Explanations

    It's about more than just getting the answer; it's also about understanding the process. Our calculator provides detailed breakdowns, ensuring you grasp the underlying principles.

  • Speed and Efficiency

    Time is of the essence. Our calculator delivers instant results necessary for class assignments or on-the-spot problem-solving.


What is the y-intercept of a straight line?

The y-intercept of a straight line is the point where the line crosses the y-axis. If the slope-intercept form of the line is $$$y=mx+b$$$, the y-coordinate of the y-intercept is $$$b$$$. At this point, the x-coordinate is $$$0$$$, so the y-intercept has the form $$$(0,b)$$$.

Can I use the Line Calculator to determine the equation from two points?

Yes, you can. By providing the coordinates of two distinct points on the line, the Line Calculator will compute the slope using the formula and subsequently determine the line's equation.

Is there a limit to the number of calculations I can perform?

No, there's no limit. Our Line Calculator is designed for unlimited usage, ensuring users can perform as many calculations as they need.

Can the Line Calculator handle fractional or decimal points?

Absolutely. There is no difference for the calculator. It will provide accurate results for various inputs.