Plan compliant ramps using rise, run, length, or angle inputs fast units. Get slope percent, ratio checks, and downloadable reports for construction teams daily.
This calculator models a straight ramp as a right triangle:
Use consistent units for rise, run, and length.
| Scenario | Rise (m) | Run (m) | Slope (%) | Ratio (1:N) | Angle (deg) | Length (m) |
|---|---|---|---|---|---|---|
| Gentle access | 0.75 | 9 | 8.33 | 1:12 | 4.76 | 9.03 |
| Space limited | 0.6 | 6 | 10 | 1:10 | 5.71 | 6.03 |
| Steeper service | 0.4 | 3.2 | 12.5 | 1:8 | 7.13 | 3.22 |
Example values are illustrative and not project-specific.
A straight ramp can be treated as a right triangle where rise is vertical change and run is horizontal distance. The calculator converts common units automatically, then reports slope as rise/run, percent grade, angle, and ramp length. Work in mm, cm, m, inches, or feet without manual conversions.
Slope is unitless, percent grade is slope × 100, and ratio 1:N is the inverse of slope. For example, a 1:12 ramp equals 8.33% and an angle of about 4.76°. These equivalent views help teams communicate intent across drawings and field notes. For ratio inputs, run equals rise multiplied by N.
If the available run is short, the rise forces a steeper grade. Use the Run + Angle or Rise + Run methods to test alternatives quickly. Small increases in run can reduce percent noticeably, improving comfort for pedestrians, carts, and wheelchairs. When space is tight, add landings or switchbacks to gain run safely.
Surface length matters for materials, handrails, and cost. The calculator uses √(rise² + run²) to estimate ramp length for ordering finishes or checking whether a ramp fits between landings without exceeding the available path. Length also supports takeoffs for edge protection, tactile strips, and drainage slopes.
Field teams often measure angles with digital inclinometers. By entering rise and angle, you can back-calculate run and confirm whether the built slope matches the design. Angles near 0° represent gentle ramps; steep ramps approach 90°.
Projects may set a minimum ratio or maximum percent grade based on accessibility goals or internal standards. Enter your targets to get a clear PASS/FAIL message. Use the checks to compare layout options during early planning, then lock the selected geometry for detailing.
The example table shows how a 0.75 m rise needs about 9.00 m run for an 8.33% grade. A 0.40 m rise over 3.20 m run is 12.50%, which may feel steep. Add your own rows to evaluate options like 1:16 (6.25%) or 1:20 (5.00%).
After calculation, export a CSV for spreadsheets or a PDF for site packages. The downloads capture the key numbers and your target checks, supporting reviews, submittals, and coordination meetings. Consistent reporting reduces rework and clarifies decisions.
Run is the horizontal distance on plan. Ramp length is the sloped surface distance. Length is always longer than run and is calculated using the Pythagorean relationship between rise and run.
Choose Rise + Ratio (1:N). Enter the rise and set N to 12. The calculator computes run as rise×12, then reports percent grade, angle, and ramp length.
Select the unit that matches your measurements on site or drawings. All length fields use the same unit, and results are displayed in that unit while calculations remain consistent internally.
PASS/FAIL compares your ramp against the target minimum ratio and maximum percent grade you entered. It helps you quickly screen options during layout and keep grades within your project limits.
Yes. Select a method that includes Angle, then enter the measured degrees and one length value. The tool will back-calculate the missing side and report the corresponding slope and ratio.
Calculate each segment separately using its rise and run. Then document each segment’s slope and provide landings between segments as required by your design and local standards.
CSV supports scenario comparison in spreadsheets, while PDF is useful for sharing in submittals and site packs. Both capture the computed geometry and your target-check outcomes for traceable decisions.
Build safer access routes with accurate ramp slope checks.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.