Slope Intercept Form Calculator
Find the slope and y-intercept of a line or convert equations into slope intercept form with this free calculator in your browser.
Enter Values
How to use this calculator
- Enter the coordinates of two points on the line.
- Read the slope, y-intercept and the full equation.
How it works
Slope m = (y₂ − y₁) ÷ (x₂ − x₁); the intercept b = y₁ − m·x₁; together they give y = mx + b.
Worked example
(0, 1) and (2, 5). m = 2, b = 1, so y = 2x + 1.
Common mistakes
- Swapping x and y when subtracting — keep both points in the same order.
- A vertical line (x₁ = x₂) has no slope in this form.
Frequently asked questions
What is slope-intercept form?
y = mx + b, where m is the slope (rise over run) and b is the y-intercept where the line crosses the y-axis.
How do I find the slope between two points?
Slope m = (y2 − y1) ÷ (x2 − x1) — the change in y divided by the change in x.
What if the line is vertical?
Then x₁ = x₂ and the slope is undefined — it can't be written as y = mx + b (its equation is x = constant).
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Cite this tool
Zerdly. (2026). Slope Intercept Form Calculator. Retrieved from https://www.zerdly.com/tools/slope-intercept-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.