Practical, everyday tools for construction, measurement and everyday maths. Calculate shed roof slopes, convert units, find areas and get accurate answers instantly — no signup, no ads, no nonsense.
The shed roof slope calculator uses the Pythagorean theorem — rafter = √(rise² + run²). Enter any one known measurement (rise, run, angle or pitch ratio) and the calculator derives everything else: wall height difference, rafter line length, eave overhang, true roof surface area, pitch multiplier and how many rafters to order. It also shows framing square settings for cutting perfect rafter angles without a protractor.
A sloped roof always covers more surface than the floor footprint beneath it. The conversion factor is called the pitch multiplier: √((rise/run)² + 1). At 4:12 it's 1.054, so a 120 sq ft shed footprint needs ~126 sq ft of roofing material. At 6:12 it's 1.118, giving ~134 sq ft. Always calculate material quantities from true roof area — ordering from floor area will leave you 5–12% short.
Our unit converter handles length, weight, volume and temperature across all common systems — imperial (feet, inches, pounds, gallons, °F) and metric (metres, kg, litres, °C). It's bidirectional: type either value and both update instantly. Useful for converting construction plans between US and metric, or kitchen measurements between tablespoons and millilitres.