Ramp Calculator Philippines 2026 | PWD & Car Ramp Slope Tool

How to calculate ramp slope in Philippines (metric guide)

Whether you're designing a PWD ramp for a commercial building, a car parking ramp in a condo, or a residential garage ramp, knowing the exact ramp gradient calculator formula is essential. In the Philippines, the National Building Code (PD 1096) and BP 344 set clear guidelines for accessibility. Using our ramp slope calculator, you can instantly determine length, percentage, and ratio – all in meters or centimeters.

Ramp calculation formula (metric)

Slope (%) = (Rise ÷ Run) × 100
Ramp length (hypotenuse) ≈ √(Rise² + Run²) but for accessibility we often use horizontal run: required length (horizontal) = Rise × (Denominator). For 1:12, length = Rise × 12.
Example: 20 cm rise × 12 = 240 cm (2.4 m) horizontal projection. Actual sloping surface length is slightly longer but negligible for construction.

🇵🇭 BP 344 & typical ramp ratios for different uses

Ramp application	Recommended slope ratio	Slope %	Max rise per segment
Wheelchair / PWD ramp (public)	1:12 (standard)	8.33%	≤ 70 cm between landings
Car ramp – parking garage	1:10 to 1:12	8.33% – 10%	Continuous max 7.5m length
Motorcycle / light vehicle	1:8	12.5%	Short ramps only
Loading dock / lorry ramp	1:6 to 1:8	12.5% – 16.7%	With anti-slip finish
Residential garage ramp	1:10 (ideal)	10%	≤ 3m rise with intermediate platform

Car ramp slope calculator: parking & basement design

For architects and engineers in the Philippines, designing a car parking ramp slope requires balancing safety and space. Standard mall ramps stay below 1:10 (10%). Use our calculator above to find the correct ramp length calculator for cars. If your vertical rise from basement to ground floor is 1.2 meters, with a 1:10 slope, the horizontal length = 12 meters, plus approach and transition.

Car ramp width: minimum 3.0m for one-way, 5.5m for two-way traffic (Philippine parking code).
Breakover angle: ensure the ramp angle doesn't cause undercarriage scraping – typical max 12% for sedans.
Circular ramp calculation: for spiral parking ramps, inner radius and slope must be coordinated, often limited to 1:10 with superelevation.

PWD ramp calculator & compliance checklist (2026)

✅ Quick checklist for BP 344 compliant ramp:

Maximum slope 1:12 (8.33%) unless space constraints allow up to 1:10 with approval.
Landing every 6 meters horizontal length or after 0.70m vertical rise.
Minimum clear width: 0.90m (1.20m for heavy traffic).
Handrails on both sides if rise > 0.20m.
Slip-resistant surface (asphalt, textured concrete).

Exclusive insight: In 2026, local building officers are strictly enforcing ramp landing dimensions. Always verify ramp gradient calculator results against actual construction permits.

How to calculate ramp slope percentage and length step-by-step

Measure total rise (vertical height difference) in centimeters or meters.
Choose desired slope ratio: For PWD ramp 1:12, for vehicle ramp 1:10.
Multiply rise (cm) × ratio denominator to get required horizontal run (cm).
Slope percentage = (rise ÷ run) × 100.
Check if ramp complies: For wheelchair, percentage ≤ 8.33% (1:12).

Example: 25 cm rise with 1:12 ratio → run = 300 cm (3.0 m), slope = 8.33% — perfect for accessibility. For car ramp same rise with 1:10 → run = 250 cm, slope = 10%.

Pro tip – Philippines climate: always add drainage channels at ramp foot and specify broom-finished concrete to prevent skidding during rainy seasons. Use our ramp slope calculator in meters to embed precise dimensions in construction plans.

Ramp gradient comparison: 1:12 vs 1:10 vs custom

Ratio	Percentage	Angle (degrees)	Best for
1:20	5%	2.86°	Very gentle, landscape
1:12	8.33%	4.76°	Wheelchair, elderly
1:10	10%	5.71°	Car parking, garage
1:8	12.5%	7.13°	Light vehicles, limited use

Frequently asked questions about ramp calculation (metric, PH code)

What is the standard ramp slope for PWD in the Philippines?
BP 344 mandates a maximum slope of 1:12 (8.33%) for wheelchair ramps in public buildings. Private residences may sometimes use 1:10 but must comply with accessibility if open to public.

How to calculate ramp length in meters from rise?
Length (horizontal) = Rise (meters) × slope denominator. For 1:12 and 0.3 m rise: 0.3 × 12 = 3.6 meters run. Our ramp calculator instantly gives you the required length.

Can I use a 1:8 slope for car ramp in a residential garage?
Yes, but it's steeper (12.5%). Ensure your vehicle has adequate ground clearance, and the surface is non-slip. For comfortable daily use 1:10 is recommended.

What is the formula to calculate ramp slope percentage?
Slope % = (vertical rise ÷ horizontal run) × 100. For a ramp that rises 0.5 m over 5 m run, slope = 10% (1:10 ratio).

Is there a maximum rise per ramp run in the Philippines?
For PWD ramps, maximum rise between landings is 0.70 m. For vehicle ramps, maximum continuous slope length is typically 7.5 m before a landing or change in direction.

How do I calculate curved ramp slope?
For circular ramps, the slope is measured along the centerline radius. Average gradient must still meet ≤1:12 for accessible routes. Our general ramp calculator gives the linear gradient; ensure you apply the same ratio along the arc.

What ramp ratio for motorcycle parking?
Motorcycle ramps can be 1:8 (12.5%) because of shorter wheelbase, but for shared parking use 1:10 for safety.

🇵🇭 Ramp Calculator Philippines 2026 update

Ramp slope & length calculator — metric

① Length from rise (PWD / car)

② Calculate slope (rise + run)