Gutter & Drainage Systems

Convert roof pitch rise and run to angle, percent slope, and pitch factor. Essential for roofing material estimates, rafter layout, and drainage design.

Convert square meters to square feet. Area conversion for real estate and flooring. Free unit converter with precise, instant browser-based conversions — no

Calculate rafter length from span, pitch, and overhang. Get rafter run, rise, diagonal length, and birdsmouth cut dimensions for roof framing.

Calculate asphalt shingles needed for your roof. Enter roof area and bundle coverage to get shingle bundles, squares, and waste allowance for reroofing.

Size gutters and downspouts from roof area and rainfall intensity. Calculate required gutter capacity, downspout count, and K-style or half-round sizing.

Calculate percentages in seven modes with visible formulas, strict input validation, signed percentage change, and symmetric percentage difference.

Simple in-browser notepad with auto-save. Write quick notes that persist in your browser. Download as text file. No signup needed.

Model one rain event with catchment area, runoff assumptions, first-flush diversion and available tank space. Inspect retained inflow and overflow.

Build a measured multi-area takeoff, compare exact carton coverage with a reviewed source-tile count, and price whole packages after matching inventory.

Calculate compacted aggregate volume, an explicit loose-order allowance, and tons from the exact supplier density without a universal conversion.

Calculate measured bed fill, an explicit top-up allowance, and optional exact-package bags without assuming one soil recipe, settling rate, or bag size.

Measure rectangular, circular and annular concrete groups with depth ranges, counts and voids. Reconcile exact bag yields or ready-mix terms and save source-owned planning records.

Turn a reviewed concrete volume range or measured rectangular pour into exact bag-pack or supplier-rounded ready-mix quantities, with matching stock and optional sourced quotes.