Whether you're graphing a line for algebra class or converting a road incline to a percentage grade, this collection has the right tool. The Slope Intercept Form Calculator and Point Slope Form Calculator handle standard line equations, while the Gradient (Slope) Calculator and Line Equation from Two Points Calculator round out the essentials.
Browse the most-popular list or open the Trending tab to see what other students are working on. Every tool is free, needs no account, and works on any device.
- Fraction Calculator
- Matrix Calculator
- Slope Calculator
- Algebra Calculator
- Trigonometry Calculator
- Percentage Calculator
- Probability Calculator
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Perpendicular Bisector Equation CalculatorFind the perpendicular bisector of a segment from two points: midpoint, perpendicular slope, y-intercept and the full line equation in seconds.
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Slope from Rise over Run CalculatorCalculate the slope (m) of a line from rise over run. Enter vertical rise and horizontal run to get slope, percent grade, and angle of incline.
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Slope-Intercept Form from a Point and SlopeFind the slope-intercept equation y = mx + b from a known slope and one point. Computes the y-intercept b instantly with steps and examples.
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Percent Grade to Degrees CalculatorConvert a percent grade (slope) into degrees instantly. Enter the grade % to get the slope angle in degrees and radians using arctangent.
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Find X and Y Intercepts of a LineFind the x-intercept and y-intercept of a line in standard form Ax + By = C. Enter A, B, and C to get both intercepts and the slope instantly.
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Percent Grade (Slope) CalculatorCalculate percent grade and slope from two points. Enter X/Y coordinates to get rise/run, slope ratio, grade percentage, and angle of incline.
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Parallel or Perpendicular Lines CheckerCheck if two lines are parallel, perpendicular, or neither by comparing their slopes. Enter m₁ and m₂ to get an instant answer with the product.
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Equation of a Line from Slope and a Point CalculatorFind the equation of a line from a slope and one point. Enter m, x1, and y1 to get the slope-intercept form y = mx + b instantly.
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Find the Linear Function f(x)=mx+b from Two PointsFind the linear function f(x)=mx+b from two points. Enter (x1,y1) and (x2,y2) to compute the slope m and y-intercept b instantly.
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Angle Between Two Lines CalculatorFind the acute angle between two straight lines from their slopes m₁ and m₂ using θ = arctan(|(m₁−m₂)/(1+m₁m₂)|). Get the result in degrees and radians.
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Slope of a Line from Two Points CalculatorFind the slope (m) of a line through two points using m = (y₂ − y₁) / (x₂ − x₁). Also returns rise, run, y-intercept and angle of incline.
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Function End Behavior CalculatorConvert a line from slope-intercept form y = mx + b into standard form Ax + By = C instantly. Enter slope and y-intercept to get A, B, and C.
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Midpoint CalculatorFind the midpoint of a line segment between two points (x₁,y₁) and (x₂,y₂) instantly using the midpoint formula. Free, fast, step-by-step.
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45-Degree Rule Rise Over Run CalculatorCalculate slope from rise over run instantly. Get the slope ratio, grade percentage, and angle of incline in degrees for any roof, ramp, or line.
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Slope to Angle CalculatorConvert a slope (rise/run) to an angle in degrees using θ = atan(m). Enter rise and run to get the incline angle, slope ratio, and grade percent.
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Y-Intercept CalculatorFind the y-intercept (b) of a line from its slope and one point. Enter m, x₁ and y₁ to get b = y₁ − m·x₁ and the full y = mx + b equation.
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Angle Between Two Lines CalculatorFind the angle between two lines from their slopes (m₁, m₂) using the tangent formula. Get both the acute and obtuse angles in degrees instantly.
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Slope to Degrees CalculatorConvert a slope value (m = rise/run) to an angle in degrees. Free slope-to-degrees calculator using angle = atan(m), with radians and percent grade.
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Slope Percentage to Degrees CalculatorConvert a slope percentage (grade) to degrees instantly. Enter the percent grade and get the slope angle in degrees and radians.
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Angle to Percent Grade CalculatorConvert a slope angle in degrees to percent grade instantly. Enter the angle and get the grade (%) and rise-per-run ratio using grade = tan(θ)·100.
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Slope From Equation CalculatorFind the slope of a line from its standard-form equation Ax + By = C. Enter A, B and C to get slope m = -A/B and the y-intercept instantly.
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Wheelchair Ramp Slope CalculatorCalculate wheelchair ramp slope ratio, grade percent and incline angle from rise and run. Check against the US ADA 1:12 (8.33%) standard.
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Perpendicular Slope CalculatorFind the slope of a line perpendicular to another instantly. Enter the original slope and get the negative reciprocal using m⊥ = -1/m.
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Degrees to Slope Percent CalculatorConvert an angle in degrees to slope percent (grade). Enter degrees to get the percentage rise/run and the equivalent 1-in-N ratio instantly.
Frequently asked questions
What line and slope calculations can I do with these tools?
The collection handles finding the slope between two points, converting between standard and slope-intercept form, writing a full line equation from two coordinates, calculating a slope as a percentage grade, and finding equations for parallel lines. It covers most needs in algebra and coordinate geometry.
How accurate are the slope and line-equation results?
All calculators apply standard algebraic formulas, verified against reference solutions. Results are reliable for coursework and general use. For road design, ramp construction, or any safety-critical civil engineering application, verify against the governing standard and have a qualified engineer review your work.
Are these slope calculators free to use?
Yes — every slope and line calculator here is completely free and requires no account or registration. Enter your coordinates or equation values and get your answer right away. No subscription is needed.
Is the data I enter stored anywhere?
No. All calculations run in your browser, and nothing you enter is sent to our servers, stored in a database, or shared with any third party. Your inputs disappear when you close the page.
Which slope calculators get the most traffic?
The default list is sorted by real visitor usage, so the most-reached-for tools appear first. Open the Trending tab to see what is surging right now, or check Recently Added for the newest tools in the collection.
