Roof Slope & Rainfall Calculator
Convert degrees, percentage, ratio and fall-per-metre; calculate roof geometry and preliminary rainfall flow.
Open roof calculatorFree project planning tools
Check roof fall, rainfall flow and ramp geometry
Get preliminary dimensions in the browser before sending your site measurements for a project-specific review.
Accessible Ramp Calculator
Calculate horizontal run, angle, gradient, surface length, flights and landings for early project planning.
Open ramp calculator on Senior Care SingaporePreliminary planning only. Confirm the specified roof system, drainage design, accessibility route, structure and approvals with the responsible professionals.