CAD, BIM and construction calculators

Convert millimetres to inches instantly, with the exact 25.4 factor, fractional inches for US drawing sets, plus the rounding rules drafters use on dimensioned sheets.

Convert feet and inches to millimetres with the exact 304.8 factor. Built for drafters redrawing US drawing sets in metric Revit or AutoCAD templates.

Convert square metres to square feet and back with the exact 10.7639 factor, plus per-unit rate conversion for area-based CAD and BIM pricing.

Calculate floor area ratio, plot ratio and site coverage from gross floor area and plot area, with the buildable-area check planners actually apply.

Calculate riser count, riser height, total going and stair pitch from a floor-to-floor height, with 2R+G comfort and code compliance checks.

Calculate ramp length, run and gradient from a rise and slope ratio, with 1:12 accessibility and landing checks for accessible route design.

Convert roof rise and run into pitch in degrees, x-in-12 ratio, percentage slope and rafter length, with the slope factor for roof area take-off.

Calculate concrete volume for slabs, footings and columns in cubic metres, cubic feet and cubic yards, with waste allowance and 25 kg bag counts.

Calculate rebar and steel plate weight in kg and lb from diameter, thickness, length and quantity, using the d²/162 rule detailers apply on bar bending schedules.