Enter values in Ramp Calculator
Enter Rise (height to climb), choose a Slope format, and add the two landing lengths. The result gives the horizontal run, Ramp (sloped) length, Slope ratio, Slope grade, angle, and Total path (ramp + landings), with the formula and assumptions shown below.
- Enter Rise (height to climb) and choose its unit.
- Choose Slope format: Ratio (1:X), Percent grade (%), or Angle (degrees).
- Enter the number for that format in Slope value.
- Replace the prefilled Top landing length and Bottom landing length with your measurements, or enter
0for a landing you want to leave out. - Click Calculate and read the result, Formula used, and assumptions table.
How to enter a ramp slope
Ratio (1:X) takes the X value only. For a 1:12 slope, enter 12 in Slope value. Percent grade (%) is rise divided by run times 100. Angle (degrees) is measured from horizontal. When you change Slope format, the current value is converted to the equivalent format.
Rise (height to climb), Top landing length, and Bottom landing length each accept inches, feet, centimeters, or meters. Slope value starts at 12; each landing starts at 5 ft.
Rise (height to climb): 24 in
Slope format: Ratio (1:X)
Slope value: 12
Top landing length: 5 ft
Bottom landing length: 5 ft
Run: 24 ft
Ramp (sloped) length: 24.08 ft
Slope grade: 8.33% (4.76 degrees)
Total path (ramp + landings): 34.08 ftWhat the ramp calculator result includes
After a valid Calculate action, the result shows Ramp (sloped) length, Slope ratio, Slope grade with its angle, and Total path (ramp + landings). Formula used shows the relationships. The assumptions table lists entered, converted, and intermediate values.
The calculation runs in your browser, and the page makes no network request with the values you enter. It converts lengths to inches internally, uses Run = Rise x Slope ratio and Ramp (sloped) length = sqrt(Rise^2 + Run^2), then adds both landing lengths to get Total path (ramp + landings).
Accepted values and geometry limits
Calculation stops with an error when a value is missing, nonnumeric, or outside its range. Rise accepts 0.01 to 600 in its selected unit. Ratio (1:X) accepts 0.5 to 100. Percent grade (%) accepts 0.5 to 200. Angle (degrees) accepts 0.1 to 80. Each landing accepts 0 to 500 in its selected unit.
The calculation represents one straight ramp run at a constant slope, with flat top and bottom landings. It leaves out switchbacks, intermediate landings, handrails, cross-slope, surface material, and accessibility or building-code requirements.
Examples with the ramp calculator
For a doorway step, measure the vertical rise and enter the available top and bottom landing lengths. Total path (ramp + landings) then includes those landing measurements.
To compare slope descriptions for the same rise, enter Ratio (1:X), Percent grade (%), or Angle (degrees). The result keeps the converted slope values with the formula and intermediate values.
Copy result puts the result in plain text. Download result (.txt) saves a file with the inputs, formulas, outputs, and disclaimer.
When to use another construction calculator
Choose Stair Calculator when the job depends on riser height, tread depth, number of steps, and stair angle. Use Roof Pitch Calculator when rise and run describe a roof. For a broader estimate, Construction Calculators groups tools for materials, dimensions, loads, solar estimates, and water volume.
Frequently asked questions
How do I calculate ramp length from rise and slope?
Enter the rise and slope, then click Calculate. The tool finds the run, calculates Ramp (sloped) length with sqrt(Rise^2 + Run^2), and adds the two landing lengths for Total path (ramp + landings).
How do I use Ramp Calculator for a 1:12 slope?
Choose Ratio (1:X) and enter 12 in Slope value. The numeric field does not accept 1:12.
Does ramp length include the top and bottom landings?
Ramp (sloped) length excludes the landings. Total path (ramp + landings) includes both. Set either landing to 0 to leave it out.
Can I use meters or centimeters in the ramp calculator?
Rise and each landing length can use inches, feet, centimeters, or meters independently. The calculator converts them before calculating.
Does the ramp calculator check building-code requirements?
No. It calculates geometry from the values you enter and does not look up ADA, accessibility, or building-code rules. Check applicable requirements with your local code and a qualified professional.