Calculated result
24ft
Ramp run
Formula
LBR-RMP-001run = rise × slope ratio; slope % = 100 ÷ ratio
8.33 %
Slope
72 ft²
Walking surface
2 ft
Rise
Lumber & framing calculator
Wheelchair ramp
Ramp run length and slope percent from total rise and a stated slope ratio. Planning geometry only — not an ADA approval.
Reviewed formula · v1.0.0
Project inputs
Enter field measurements. Imperial lengths take feet and inches. Unit conversion happens before the reviewed formula is applied.
All values can be refined when you edit the estimate. This tool does not replace field verification or local requirements.
Transparent cost view
Planning rates only. Pick a currency — badges, inputs, and totals follow. Material is a rate. Labour is hours × a planning hourly rate. Equipment and delivery are this-job amounts.
Planning defaults are office figures, not a bid. US ready-mix in 2026 often lands around $125–165 per cubic yard delivered; place-and-finish commonly $2–4 per square foot. Replace every rate with a supplier or crew quote before you send the letter.
Indicative FX as of Aug 2026. Planning conversion, not a live bank rate.
Material costUSD 2,040
Labour (8 h)USD 280
Direct costUSD 2,430
Overhead + contingencyUSD 243
Markup + taxUSD 321
Estimated project totalUSD 2,994
How this calculator works
A transparent wheelchair ramp takeoff.
Ramp run equals total rise times the slope ratio (12 for a 1:12 planning slope). Slope percent is 100 ÷ ratio. This is geometry for a material and landing sketch, not an accessibility approval.
Worked example. Example: a 24 in rise at 1:12 needs 24 ft of run. At 3 ft wide the walking surface is 72 ft². A 1:12 slope is 8.33%.
- 1. Measure the finished floor-to-floor rise, including any threshold.
- 2. Enter 12 for a 1:12 planning slope unless the job calls for a gentler ratio.
- 3. Landings, handrails and edge protection are extra — this tool does not place them.
Need the broader workflow? Read the lumber & framing planning guide.
Questions
Questions about wheelchair ramp
Is this ADA compliant?
No. Construclytic is not an accessibility inspector. 1:12 and 36 in width are common planning figures. Confirm the applicable standard, landings and handrails before you build.
What about switchbacks?
A long run may need a landing every 30 ft of run under common rules. Split the rise and add landing area as its own line.
What is the formula ID?
This calculator publishes formula LBR-RMP-001, version 1.0.0. The ID stays on the result and on the estimate line.
Is this engineering advice?
No. Construclytic is a planning website, not a registered engineering or contracting firm. Field checks, codes and product data still sit with you.
Does Construclytic fetch live supplier prices?
No. Costs use the rate you enter. Construclytic does not fetch live supplier prices.